How to think about tax filing, and how not to lose what you hold.
Tax and safetyIntermediateTwo methods are used to work out the cost basis of a crypto asset: the total average method and the moving average method. The choice changes how gains fall across years, but over the full life of a holding the totals converge. Which method you may use, and whether a filing is required to elect it, is set by the rules — check the National Tax Agency's guidance and a tax professional.
7 min
Tax and safetyIntermediateA taxable event is not limited to converting back to yen: swapping one crypto asset for another, and paying for things with crypto, also realise a gain or loss. In Japan, income from crypto assets is in principle classified as miscellaneous income. Check the National Tax Agency's guidance and ask a tax professional how your own transactions are treated.
7 min
Tax and safetyIntermediateFiling for crypto follows three stages: gather your history, calculate the result, then enter it on the return. Whether you need to file at all, and where the figures go, are set by rules that change. Check the National Tax Agency's guidance, and engage a tax professional when the amounts are significant or the treatment is unclear.
8 min
Tax and safetyBeginnerSave your transaction history yourself, before it becomes unreachable. Exchanges limit how far back you can view, and a service that shuts down takes its records with it. How long records must be kept, and what counts as a record, are set by rules — check the National Tax Agency's guidance and a tax professional.
6 min
Tax and safetyAdvancedCrypto income is in principle miscellaneous income, and losses in that category cannot be offset freely against other kinds of income. What you can do with a loss depends on its classification and on rules that change. Check the National Tax Agency's guidance and consult a tax professional about your own case.
7 min
Tax and safetyBeginnerPhishing works by showing you a convincing screen and letting you do the damage yourself. Never type a seed phrase or private key into anything. Reaching official sites only through your own bookmarks prevents most of it.
6 min
Tax and safetyIntermediateAn approval grants a third-party contract permission to move your tokens. Once given, it stays until you revoke it. Review and revoke approvals for services you have finished using.
6 min
Tax and safetyBeginnerOfficial support at an exchange or wallet does not message you first. Treat anyone who contacts you claiming to be support as a scammer. When you have a problem, start from your own bookmark of the official site.
5 min
Tax and safetyBeginnerA seed phrase is the wallet. Anyone who knows it can move the funds. Keep it offline on something physical, and never type it into any service or reveal it to anyone.
6 min
Tax and safetyIntermediateAssets in a self-custody wallet whose seed phrase and private key are both lost are, as a rule, unrecoverable. Recovery is only possible where part of a backup survives, or where a custodian such as an exchange holds the account. Do not engage anyone who offers to get them back.
6 min
Tax and safetyAdvancedCrypto in a self-custody wallet is unreachable if your family does not know where the keys are — yet sharing the keys outright creates a theft risk while you are alive. Because the tax and legal treatment matters too, consult professionals such as a tax accountant and a lawyer.
7 min
Tax and safetyIntermediateRisk management is not a way to avoid losses; it is designing things so that a loss does not break your finances or your judgement. In crypto, price is only one of several risks alongside custody, counterparty and regulation. Nothing here recommends a particular amount or product.
7 min
Tax and safetyBeginnerDollar cost averaging means buying a fixed amount at regular intervals so that your average entry price is smoothed. It removes the need to time purchases, but it does not prevent losses when prices keep falling. Nothing here recommends a particular amount, frequency or asset.
6 min
Tax and safetyIntermediateAllocation means deciding in advance what proportion sits where. The right allocation depends on your income, outgoings, time horizon and tolerance for loss, so it cannot be generalised. This page recommends no specific allocation or asset, and no allocation prevents losses.
7 min
Tax and safetyBeginnerGuaranteed principal, a certain return, a deadline that pressures you, and rewards for recruiting others — if any of these four appear, step back before evaluating the details. The most practical rule is to stay out of anything whose mechanism you cannot explain.
6 min
Tax and safetyIntermediateTrading crypto does not automatically mean you must file a return in Japan. Whether you need to depends on things like whether you are an employee, what other income you have, and how your year-end adjustment was handled — and this site cannot draw that line for you. Find the description that matches your own situation in the National Tax Agency's guidance, and if it is still unclear, ask the tax office or a tax accountant.
7 min
Tax and safetyIntermediateMost of what stalls a crypto return is missing material, not difficult arithmetic. Pulling together exchange history, wallet records, cash movements and last year's closing figures before you start will cut the number of times you grind to a halt. Check the National Tax Agency's guidance for what is actually required, and ask a tax accountant about anything unclear.
6 min
Tax and safetyIntermediateCollecting data means working three fronts: exchanges, wallets, and reward services. An exchange's annual statement leaves out everything that happened in self-custody or in DeFi. When you finish, keep a list of what you pulled from where — that list is how you later notice what is missing. Check the required scope of records with the National Tax Agency and ask a tax accountant where it is unclear.
6 min
Tax and safetyIntermediateExporting CSVs looks trivial, but it is where data quietly goes missing — wrong date range, a record type you did not export, an encoding that mangles the file. Always open what you exported and check the period, the row count and the contents. Confirm the required scope of records with the National Tax Agency and take judgement calls to a tax accountant.
6 min
Tax and safetyIntermediateThe CSVs you collected will not line up as they are: different date formats, different decimal handling, different names for the same kind of event. Normalising those and removing duplicates is real work — and every change you make should be written down. If you are unsure whether an adjustment is appropriate, ask a tax accountant.
7 min
Tax and safetyIntermediateIf part of your history cannot be retrieved, the answer is never to put in a number that seems about right. The practical approach is to work out a figure by a method you can defend from the material you still have, and to document that method and its basis. Which method is appropriate depends on the facts, so take it to a tax accountant.
8 min
Tax and safetyAdvancedHistory from an exchange that has closed, or entered an insolvency process, cannot be retrieved the usual way. Work whatever contact routes and external records remain, estimate the rest by a method you can explain, and document the whole sequence. The treatment of assets caught up in a failure is a particularly difficult judgement — consult a tax accountant.
8 min
Tax and safetyIntermediateNobody totals up a self-custody wallet for you. You need to identify every address you used, pull history per chain, and distinguish movements between your own accounts from genuine transactions with others. Points requiring judgement, such as how gas costs are handled, should go to the National Tax Agency's guidance and then to a tax accountant.
7 min
Tax and safetyAdvancedOnce a bridge is involved, an asset vanishes on one chain and appears from nowhere on another. Unless you match the two sides and tie them into a single movement, the calculation will not hold together. How a particular bridge is treated can depend on how it works, so consult a tax accountant.
7 min
Tax and safetyIntermediateCrypto prices differ between venues, so you have to decide which source your valuations come from. What matters is using one basis consistently through the year and being able to explain it. Which source is appropriate depends on the circumstances — check the National Tax Agency's guidance and ask a tax accountant.
6 min
Tax and safetyIntermediateIf you traded in US dollars or a dollar-denominated stablecoin on an overseas venue, the return needs yen. Decide which exchange rate and which moment you use, apply that consistently through the year, and record the basis. Parts of this are set by the rules, so check the National Tax Agency's guidance and a tax accountant.
6 min
Tax and safetyIntermediateCrypto quantities carry many decimal places, and rounding partway through lets error accumulate. The practical rule is to keep quantities at full precision and round only at the final step. How figures are rounded on the return itself is addressed by the rules — check the National Tax Agency's guidance and a tax accountant.
5 min
Tax and safetyIntermediateWhen the calculation is done, do not take the result at face value — check it from a few angles. Comparing closing balances against what you actually hold, sanity-checking transaction counts, and looking for outliers will surface missed imports and misclassifications. Take any difference you cannot resolve to a tax accountant.
6 min
Tax and safetyIntermediateWhere transaction counts are high, calculation software is a sensible choice. But the cost basis setting, the transactions that failed to import and the carry-forward from last year are all things the user has to verify. Automatic calculation does not move responsibility for the return away from the person filing it. This site does not recommend any particular product.
7 min
Tax and safetyIntermediateCalculation tools are not comprehensive. Complex DeFi actions, newer transaction types, and history from unsupported chains or venues may fail to import or import as the wrong kind of event. Identify what did not come through, fill it in manually, and record what you did. Take anything uncertain to a tax accountant.
6 min
Tax and safetyIntermediateAlways test a tool's output from an independent angle before you use it: reconcile closing balances, re-check the settings, and hand-trace a few representative transactions end to end. If a figure still does not make sense after that, do not file on it — have a tax accountant look at it.
6 min
Tax and safetyIntermediateDocuments you submit with a return and documents you keep but do not submit are two different sets. The history and calculation detail behind a crypto figure generally belong to the second set — not sent in, but ready to show if asked. What must be submitted and what must be retained is set by the rules, so check the National Tax Agency's guidance.
5 min
Tax and safetyIntermediatee-Tax is the National Tax Agency's electronic filing system. Using it requires setting up an identity verification method in advance, so it is not something to start on the day. The steps and prerequisites are updated from year to year — always take them from the official National Tax Agency and e-Tax pages.
5 min
Tax and safetyIntermediateA return can be submitted on paper or electronically. The two differ in what you have to prepare and in the steps involved, and in some cases in the treatment that applies. Which suits you depends on your situation — check the differences on the National Tax Agency and e-Tax pages, and ask a tax accountant if the choice matters to you.
5 min
Tax and safetyIntermediateA return is filed during a set period in the following year. The exact dates vary from year to year, so take them from the National Tax Agency's guidance. Because crypto history takes time to collect and calculate, starting once the period opens can be too late — begin preparing while the year is still running.
5 min
Tax and safetyIntermediateOnce the return is in, file the copy and the supporting material together by year, and note the closing balances that carry into next year's calculation. Payment and local tax procedures may still follow. What remains depends on your circumstances — check the National Tax Agency's guidance and ask the tax office or a tax accountant if unsure.
5 min
Tax and safetyAdvancedIf the tax office gets in touch, the basic response is to establish exactly what is being asked, then organise and present the records you hold. Do not answer from guesswork — check first, then reply. Where the matter is involved or you are uneasy, engage a tax accountant early and, if appropriate, ask them to attend.
7 min
Tax and safetyIntermediateIf you hand a crypto return to a tax accountant, the better organised your material, the smoother and usually the cheaper the engagement. Establish at the outset whether they have experience with crypto and exactly what the engagement covers. Since responsibility for the return does not leave you entirely, make sure you understand what comes back.
6 min
Tax and safetyBeginnerRecords fall into two groups: what you did, and where things are. The first backs up your calculations and your tax return; the second is what lets you — or your family — find the assets at all. Keys belong in neither. What documentation the rules require is set by law, so check the National Tax Agency's guidance and a tax professional.
6 min
Tax and safetyBeginnerAlongside exchange history and tool exports, keep one log of your own. Six fields — date, asset, quantity, value, fee, venue — are enough to make later calculations solid. What documentation a return requires is a matter for the National Tax Agency's guidance and a tax professional.
5 min
Tax and safetyBeginnerExchange history is usually viewable only for a limited window, and closing an account puts it out of reach entirely. Download the annual statement and the CSVs on a schedule, before you need them. Which documents support a return is a question for the National Tax Agency's guidance and a tax professional.
5 min
Tax and safetyIntermediateThe chain itself does not forget, but the tools that read it and your own understanding of what a transaction was do not persist. Keep the transaction hash, and one line saying what it was, on your side too.
6 min
Tax and safetyBeginnerWallets multiply quietly and then get forgotten. Write down how many you have, of what kind, holding roughly what, kept where. No keys go in this list — it records locations only.
6 min
Tax and safetyBeginnerVerify the destinations you use often once, carefully, then keep them in an address book. It removes most of the risk that comes from pasting an address afresh every time — provided the verification at registration is genuinely thorough.
5 min
Tax and safetyIntermediateCost basis can only be captured accurately at the moment of purchase. Reconstructing it later means hunting down the price, quantity and fee for every acquisition. Which calculation methods apply and what documentation is needed are set by the rules — check the National Tax Agency's guidance and a tax professional.
7 min
Tax and safetyIntermediateFees scatter across transactions and are hard to gather after the fact. Record trading fees, withdrawal fees and network fees separately, as they occur. How they may be treated for tax is a matter for the National Tax Agency's guidance and a tax professional.
6 min
Tax and safetyIntermediateAirdrops slip out of records precisely because you did not buy them, and that is what makes quantities stop reconciling later. Note the date, asset, quantity and value at receipt on the day. How they are taxed is a matter for the National Tax Agency's guidance and a tax professional.
6 min
Tax and safetyIntermediateStaking rewards arrive often and in small amounts, so logging each one by hand is not realistic. Export the raw receipts on a schedule and summarise by period instead. How they are taxed is a matter for the National Tax Agency's guidance and a tax professional.
6 min
Tax and safetyIntermediateEvery NFT has its own cost, so each one needs its own record of what it cost you. Noting the contract address and token ID is what makes a specific piece identifiable later. The tax treatment is a matter for the National Tax Agency's guidance and a tax professional.
6 min
Tax and safetyIntermediateIn DeFi your deposit is often replaced by a different token, so a balance screen alone will not tell you what is where. Record deposits, withdrawals and the receipt tokens you get back, with the protocol name. The tax treatment is a matter for the National Tax Agency's guidance and a tax professional.
7 min
Tax and safetyBeginnerA backup plan starts from how things get lost. Keep copies in places that fail in different ways — device failure, account lockout, disaster, your own mistake — so that no single event takes them all. This applies to transaction records; it does not apply to seed phrases.
6 min
Tax and safetyIntermediateEncryption is what keeps a record unreadable if it ends up in someone else's hands. But the strength of it comes down to the passphrase and where you keep a copy of that passphrase. This page covers the general thinking only; for software settings, read the product's own documentation.
6 min
Tax and safetyBeginnerOffline storage trades away the risk of remote theft and takes on the risk of physical loss and disaster instead. Keys such as seed phrases belong offline only; records you consult often can take advantage of online convenience.
6 min
Tax and safetyBeginnerHow many copies matters less than whether each one fails for a different reason. Check that no single incident can take them all. And too many copies creates its own problem: the ones you stop updating.
5 min
Tax and safetyBeginnerRecords are at their most accurate the day you write them and drift from then on. Pick one day a year to check the wallet inventory, the exported history, and where the backups actually are. That review is what keeps records usable.
5 min
Tax and safetyBeginnerA list of the exchanges, wallets and related services you use serves both your own management and your family's ability to understand the situation if something happens. Record the service name and the registered email address — not passwords, not two-factor details.
5 min
Tax and safetyIntermediateWhen an exchange or tool winds down, the history it held generally becomes unreachable. Waiting for the announcement often means missing the deadline, so export the history of the services you use while nothing is happening.
6 min
Tax and safetyBeginnerThe accident that happens most often when changing phones or computers is forgetting to migrate the authenticator app. Before you let the old device go: migrate two-factor, confirm wallet recovery, and move your records off it — and verify recovery by actually using the new device.
6 min
Tax and safetyIntermediateAn instruction document is not for handing over keys. It is for conveying what exists and where to look. Leave the keys out; describe the location and the route to opening it. For the legal side, consult professionals such as a lawyer and a tax accountant.
7 min
Tax and safetyAdvancedLegal documents such as wills can be read by people other than you during the procedures that follow. Writing a key into one exposes the assets at that moment. Let the document address who inherits, and handle where the key is and how it opens separately. For requirements and form, consult a professional.
7 min
Tax and safetyIntermediateAny arrangement that places keys or credentials with a third party takes on new risks: the provider failing, and misuse from inside it. This site recommends no specific service. If you consider one, minimise what you hand over and design the legal side with a professional.
7 min
Tax and safetyBeginnerCrypto prices can move a great deal from one day to the next. Knowing that range in advance is about reducing panicked decisions when it happens — it does not prevent losses. This page makes no forecast and recommends no particular asset or amount.
6 min
Tax and safetyBeginnerDeciding your ceiling before you buy makes it harder for the amount to creep upward while you watch prices. What that ceiling should be depends on your income, outgoings and household, so it cannot be generalised. This site names no amount or percentage, and a ceiling does not prevent losses.
6 min
Tax and safetyBeginnerMoney for a loss of income or an unexpected bill is commonly kept apart from anything whose price moves. The point is not to prevent losses but to keep daily life running regardless of what prices do. How much that takes differs by person, and this site names no figure.
6 min
Tax and safetyBeginnerSorting your money by when you expect to spend it makes it less likely that money with a fixed due date ends up somewhere its value moves. This is not a claim that holding for longer avoids losses. No particular horizon or product is recommended here.
6 min
Tax and safetyBeginnerWhat you hold cannot always be turned into cash when you want it, at the price you want. Thin trading, withdrawal limits and operator outages all get in the way. This page recommends no asset or operator, and checking liquidity does not prevent losses.
6 min
Tax and safetyBeginnerWhen holdings cluster in one asset, one exchange or one chain, a problem there lands on everything at once. Spreading out dilutes problems specific to a single target; it does nothing about a market-wide decline.
6 min
Tax and safetyIntermediateDifferent crypto assets tend to move in the same direction. Holding several does not prevent losses when the market as a whole falls. This page recommends no asset or combination and predicts nothing about how they will move together in future.
6 min
Tax and safetyIntermediateLeveraged trading can lose more than you deposited. Even when the eventual direction is right, a move along the way can force liquidation and lock in the loss. This page recommends no strategy and no level of leverage.
7 min
Tax and safetyIntermediateWhile your assets sit with an exchange or a lending service, that operator failing or halting can leave you unable to withdraw. This is a different risk from prices falling and needs to be considered separately. No operator is recommended here.
7 min
Tax and safetyIntermediateKeeping crypto at an exchange and keeping it in a wallet you control expose you to different risks. Both carry risk; neither choice is the safe one. This page recommends no custody method or product.
7 min
Tax and safetyIntermediateCrypto assets and DeFi services rest on several layers — smart contracts, bridges, oracles, the underlying chain. A fault or attack at any one of them can destroy value regardless of what prices were doing. No service is recommended here.
6 min
Tax and safetyIntermediateLaws, tax rules and operator requirements around crypto are under continual review in every jurisdiction. Planning as though today's conditions will persist leaves you unable to respond when they change. This page does not explain the rules themselves — always check official sources for the current position.
6 min
Tax and safetyIntermediateThe year a gain arises and the time you pay tax on it are not the same. If prices fall or the money gets spent in between, you can find yourself short. This page states no rates or calculation methods — confirm the specifics with National Tax Agency materials and a tax professional.
6 min
Tax and safetyBeginnerSharp rallies, and people around you talking about gains, apply pressure to decide quickly. This is a well-documented tendency in how people think, and simply noticing it has value. This page neither encourages nor discourages any particular trade.
5 min
Tax and safetyBeginnerMoney already spent and time already invested cannot be recovered by any future decision. People nonetheless tend to keep going in proportion to what they have already put in. This page describes that tendency; it does not tell you to continue or to stop.
5 min
Tax and safetyBeginnerPeople are known to gather information that supports what they already think and to discount what contradicts it. Collecting more of it while collecting it selectively only increases conviction. This page describes the tendency; it recommends no particular conclusion.
5 min
Tax and safetyBeginnerOn social platforms, gains are prominent and the poster's interests are hard to see. Treating what appears in your feed as a fair sample of reality skews the premises of any decision. This page evaluates no account or service and recommends no trade.
6 min
Tax and safetyBeginnerJudging information by its content alone is hard. Checking who published it, when, and from what position at least changes how you weigh it. This page recommends no source or asset, and checking prevents no losses.
6 min
Tax and safetyBeginnerJotting down the reason whenever you buy, sell or deliberately do nothing lets you look back at how you were thinking. A record prevents no losses; it makes your reasoning reviewable afterwards. No particular decision is recommended here.
5 min
Tax and safetyIntermediateFixing in advance how often you will review your holdings and your custody setup reduces ad hoc reactions to price moves. A review is not a loss defence; it is how you notice the gap between your assumptions and your current position. No particular frequency or decision is recommended here.
6 min
Tax and safetyIntermediateOne approach is to decide what would make you let go before prices move — including the decision to realise a loss, put into words ahead of time. This site names no level or condition, and having an exit plan does not prevent losses.
6 min
Tax and safetyBeginnerIt helps to decide in advance what would make you stop altogether. Dipping into living costs, borrowing to fund positions, losing sleep or being unable to work are all reasons to reconsider continuing. If you are struggling, public consultation services exist.
7 min
Tax and safetyBeginnerIf nobody you trust knows that the assets exist and how they are stored, nothing can be recovered if something happens to you — it is simply lost. At the same time, announcing holdings publicly raises your risk of being targeted. Who you tell and how widely are separate questions.
7 min
Tax and safetyBeginnerIf the device you open your wallet on is compromised, no storage scheme survives it. Keep the OS and apps updated, install as little as possible, and lock the screen. Those three habits remove most device-borne risk.
6 min
Tax and safetyBeginnerThe most common way an exchange account falls is a password reused from a site that leaked. Give every service its own long, unique password and let a password manager hold them. Seed phrases and private keys, however, do not go in there.
5 min
Tax and safetyBeginnerNot all second factors are equal. SMS is vulnerable to phone-number takeover (SIM swapping), an authenticator app is stronger, and a hardware security key also resists phishing. On your exchange and your email, use the strongest method available.
6 min
Tax and safetyBeginnerYour email account holds the reset authority for every other account. Lose it and your exchange passwords fall one by one. Use an address reserved for crypto and give it the strongest second factor available.
5 min
Tax and safetyIntermediateA SIM swap is someone impersonating you to your mobile carrier to take over your line. With your number, they receive your SMS codes and pass phone-based identity checks. Move your authentication off the phone number, and add a PIN or lock on the carrier account itself.
6 min
Tax and safetyBeginnerThe main risk on public Wi-Fi is less eavesdropping than fake access points and fake sign-in pages. Do anything involving assets on a connection you control, and do not open balances in public. That avoids most of it.
4 min
Tax and safetyIntermediateA browser extension can read and modify the pages you are looking at. On the browser you use for wallets, keep only what you need. Popular extensions have been sold on and turned malicious through a routine update.
5 min
Tax and safetyBeginnerYou cannot tell a fake site by looking at it. What you can rely on is how you got there. Verify each URL once, carefully, bookmark it, and from then on open it only that way.
5 min
Tax and safetyIntermediateSigning is executing. Refuse any signature whose effect you cannot describe. Most wallets now simulate the transaction and show the expected balance changes — all you have to do is check that what it shows matches what you intended.
6 min
Tax and safetyIntermediateAn unlimited approval covers not only what you hold now but whatever arrives later. If your wallet lets you set a cap, cap it at the amount this transaction needs. It costs a little more gas, and in return you decide the maximum possible loss.
5 min
Tax and safetyIntermediateUsing one wallet for long-term holdings and for everyday experimentation means one mistake costs everything. Separate the vault from the wallet you connect to sites with. Splitting is how you decide in advance what a mistake can cost.
5 min
Tax and safetyBeginnerThe first time you send to a new destination, send a small amount and confirm it arrives. Blockchain transfers cannot be undone, and a few hundred yen in fees buys protection against losing the lot.
4 min
Tax and safetyIntermediateMost exchanges let you restrict withdrawals to addresses you registered in advance. Because adding a new one takes a waiting period, an attacker who takes over the account cannot immediately move funds out. Turn it on where it is offered.
4 min
Tax and safetyIntermediateApprovals you granted in the past stay live until revoked. Every few months, open an approval manager and revoke what you no longer use and what you do not recognise. Revoking costs gas, and it reliably lowers your maximum exposure.
5 min
Tax and safetyIntermediateDecide the order in advance: move what remains, revoke approvals, contact the exchange, preserve evidence. Recovery is not guaranteed, but stopping further loss usually is. And do not, in the panic, reach out to anyone promising to get it back.
7 min
Tax and safetyBeginnerIn Japan, fraud and unauthorised-access cases can be reported to the cybercrime consultation desk of your prefectural police. Consumer problems, including disputes with operators, are handled by local consumer affairs centres reachable via the national consumer hotline. Gather your records before you go.
5 min
Tax and safetyBeginnerA second wave of scammers targets people who have already been robbed, offering to get the funds back. Anyone asking for a payment up front is a scammer, without exception. Your loss is visible on-chain and in your public posts, so they know exactly who you are.
5 min
Tax and safetyIntermediateTell your family nothing and your assets vanish with you. Tell them everything and you have created a new leak path. The workable line is to share what exists and where to look, while keeping the keys themselves under separate control.
5 min
Tax and safetyIntermediateTravel raises three risks at once: losing a device, using networks you do not control, and drawing attention. The principle is to carry only what you need, holding only what you need. In most cases there is no reason to take your backup medium with you at all.
5 min
Tax and safetyBeginnerThe strongest defence is that nobody knows you hold anything. Do not announce your holdings, do not tie them to your real name or location, and do not do in-person trades. Not giving anyone a reason to target you comes before any technical measure.
5 min
Tax and safetyIntermediateNobody can open a self-custody wallet unless you leave a procedure. Write down what exists and where the material is kept, and store that document separately from the keys themselves. Then, while you are well, verify that the procedure actually works.
5 min
Tax and safetyIntermediateThe most dangerous state is not knowing what you hold where. Once a year, list your accounts, wallets, approvals, backups and devices, and fix the weakest one at a time. The act of writing it out is itself a countermeasure.
6 min
Tax and safetyBeginnerSecurity is not a thing you set once. Run a thirty-minute check every month: login history, approvals, updates, and where your backups are. Those four alone bring forward the moment you notice something is wrong.
5 min
Tax and safetyBeginnerA crypto asset carries no promise that the money you put in will still be there. If the price falls, you lose part or all of what you paid. Before deciding whether to start at all, find out what is not guaranteed, what it costs in money and effort, and who — if anyone — helps when something goes wrong. This page is that checklist.
6 min
Tax and safetyBeginnerTo use a registered exchange in Japan you will generally need identity documents, a bank account in your own name, and an email address and phone number you can actually receive on. The exact documents and flow differ by provider, so read their own guidance before applying. Having the paperwork ready is not the same as having decided to proceed.
5 min
Tax and safetyBeginnerNot everyone can open an exchange account on the same terms. Age, country of residence, and occupation can all mean an application is declined or needs extra checks. The conditions differ by provider and do change, so always read the current terms of the specific exchange you are considering.
5 min
Tax and safetyBeginnerThe first thing to learn is not which coin to hold or how to read a chart, but what is not guaranteed and where people lose their assets. Starting with individual coins turns the exercise into picking one. Cover the mechanics, the risks, and the rules first; only then, if you still need to, move on to specifics.
5 min
Tax and safetyBeginnerA number of false beliefs about crypto circulate widely. 'No tax until I convert back to yen', 'money sitting on an exchange is safe', 'a mistaken transfer can be reversed' — none of these are true. Starting out with them intact means discovering later that the cause of a loss was your own misunderstanding.
6 min
Tax and safetyBeginnerCrypto prices move sharply in both directions, and can stay below what you paid for a long time. Rather than planning around a rise, work out in advance what your position looks like if the price falls and does not come back. This site offers no view on future prices.
6 min
Tax and safetyBeginnerOpening an account is not the end of it. Keeping trade records, revisiting security settings, and working out once a year whether you need to file all continue for as long as you hold. If you cannot spare that time, not starting is a reasonable conclusion.
5 min
Tax and safetyBeginnerFees are not the whole cost. There is the spread between the buy and sell price, deposit and withdrawal charges, on-chain transfer fees, and tax on any gain. In the normal case you are below your purchase price from the moment you buy.
6 min
Tax and safetyBeginnerIn Japan, the Payment Services Act defines the term crypto asset, and businesses that exchange or trade them for customers must register with the Financial Services Agency. The FSA publishes the register, so you can always check before using a provider. The detailed requirements change, so consult the FSA's own material for specifics.
6 min
Tax and safetyBeginnerUsing a registered provider matters: it puts the relationship inside a framework of disclosure duties and segregation of customer assets. But crypto transactions carry no cooling-off right, and no one compensates you for a fall in price. Use an unregistered operator and you fall outside even that minimum framework.
6 min
Tax and safetyBeginnerCrypto assets carry no principal guarantee. They are outside deposit insurance, there is no assurance that assets held at an exchange come back in full if it fails, and nothing guarantees any price. Confirm these three points before deciding whether to start.
7 min
Tax and safetyBeginnerA bank deposit is covered by deposit insurance and does not shrink in nominal terms. A crypto asset has no such coverage, and its value moves with the market. Interest versus price movement, protection versus none, and the tax treatment are all different by design. This is not a ranking.
6 min
Tax and safetyBeginnerA share is a stake in a company, with mandated disclosure and shareholder rights attached. Many crypto assets have no issuer at all, and the disclosure framework is different. Trading hours, limits on daily movement, and tax classification differ as well. Treat them as different in kind, not as better or worse.
6 min
Tax and safetyBeginnerRetail FX trades exchange rates between currencies and operates in Japan under its own framework, including registration and caps on leverage. Crypto sits under different rules, and the underlying asset, the size of price movements, and the tax classification are all different. Both can produce losses.
6 min
Tax and safetyBeginnerQuestions about regulation, registration and tax are answered by official bodies — the Financial Services Agency, the National Tax Agency, and consumer affairs bodies. Social posts and aggregator sites go stale, and some deliberately rely on superseded rules. Before any decision that matters, go to the primary source.
5 min
Tax and safetyBeginnerAssume that anyone publishing about crypto has an interest: a referral fee, a position they want to see rise, or advertising revenue. Start by asking who is writing and what they gain. Confident predictions and deadline pressure are, by themselves, reasons to disbelieve.
6 min
Tax and safetyBeginnerSocial media recommendations, influencer endorsements, flat assertions that something will rise, and deadline-driven pitches are standard tools in fraud and market manipulation. What they share is that they leave you no time to check. If you feel hurried, step away from that transaction entirely.
6 min
Tax and safetyBeginnerThere are questions to answer for yourself before deciding. Could you lose all of it without it affecting your life? Could you hold through two years at half the price? Did this idea start with someone else's recommendation? Any question you cannot answer is a reason not to start now.
5 min
Tax and safetyBeginnerEven if you decide to proceed, there is no reason to move a meaningful sum at the outset. Splitting it into stages — opening the account and configuring security and then stopping, testing a transfer with the smallest amount — limits the damage from mistakes and misunderstandings. Starting small is not a profit technique; it is a way of losing less to error.
5 min
Tax and safetyBeginnerAfter a purchase, what matters is not tracking the price but keeping records and checking settings. Save the transaction history, review two-factor authentication and withdrawal settings, and decide how you will total results. Doing this at the start avoids the situation where the history cannot be reconstructed later.
6 min
Tax and safetyBeginnerA mistaken transfer, a frozen withdrawal, an outright fraud — in every case, stop sending and stop depositing first. Then contact the provider through its official channel, and if fraud is suspected, the police and a consumer affairs centre. Because on-chain transfers cannot be reversed, recovery is often not possible.
6 min
Tax and safetyBeginnerWhere to go depends on the question. Account and transaction issues go to your provider's official support, tax questions to a tax professional, and fraud or aggressive solicitation to a consumer affairs centre and the police. Never take it to a self-declared expert who approached you on social media. Asking the wrong party is how damage grows.
5 min
Tax and safetyBeginnerCrypto writing is dense with jargon, and reading past a term you do not know lets misunderstandings accumulate. You do not need all of it. Roughly ten terms carry the foundations; the rest can wait until you actually meet them. When a word you do not know appears, stop there and look it up.
5 min
Tax and safetyIntermediateCrypto received from mining is recognised as income based on its value at the time of receipt, and a further gain or loss arises when you later sell it. For an individual the income is in principle miscellaneous income, but the classification can differ depending on the scale and substance of the activity, so it is not a single answer for everyone. Check the National Tax Agency's current guidance and ask a tax professional how your own case is classified.
7 min
Tax and safetyIntermediateStaking rewards follow the same two-step logic: income recognised at the value when received, then a further gain or loss on disposal. What is less settled is when receipt actually occurs, because that depends on how the particular mechanism works — and in some designs the treatment is not clearly established. Check current National Tax Agency guidance and ask a tax professional about the service you use.
7 min
Tax and safetyIntermediateInterest received from lending out crypto is, as a baseline, recognised as income at its value when received. How to treat amounts accrued but not yet paid, and exactly when receipt occurs, are less clearly established. Check National Tax Agency guidance and take your actual contract terms to a tax professional.
6 min
Tax and safetyIntermediateAn airdrop raises the question of recognising an economic benefit received, with a further gain or loss when the tokens are later sold. When that income should be recognised, and how to value a token with no meaningful market, are not clearly established. Check National Tax Agency guidance and take the judgement to a tax professional.
7 min
Tax and safetyIntermediateWhen a hard fork leaves you holding a new coin, you paid nothing for it, so the question is what cost basis applies. A later sale requires a gain or loss calculation, and that calculation depends on how the rules treat the basis. Check National Tax Agency guidance and take the judgement to a tax professional.
6 min
Tax and safetyIntermediateWhere an NFT sale produces a profit, the income classification depends on what you sold and in what capacity — creating and selling your own work is not the same situation as reselling something you bought. Also remember that paying in crypto realises a gain or loss on that crypto as well. Check National Tax Agency guidance and consult a tax professional.
7 min
Tax and safetyIntermediateA swap on a DeFi protocol fits the established framework: exchanging one crypto asset for another realises a gain or loss. Liquidity provision and more composite operations are different — what happened, and when, is often not clearly established. Separate what is settled from what is not, check National Tax Agency guidance, and consult a tax professional.
8 min
Tax and safetyIntermediateExchanging one crypto asset for another realises a gain or loss on the asset you gave up, even though no yen was involved. 'I never cashed out to yen, so it does not apply to me' is a misreading. Check National Tax Agency guidance and ask a tax professional how your own transactions are treated.
6 min
Tax and safetyIntermediatePaying for goods or services in crypto means disposing of that amount at its value at the time, which realises a gain or loss under the established framework. If it feels like 'just shopping', the records never get made. Take current treatment from National Tax Agency guidance and judgements to a tax professional.
6 min
Tax and safetyIntermediateGiving or donating crypto raises questions for both the giver and the recipient, and can involve taxes beyond income tax, such as gift tax. Treatment depends on the relationship and the manner of transfer, so check National Tax Agency guidance and consult a tax professional before you act.
6 min
Tax and safetyIntermediateFor a Japanese resident, income is in principle reportable regardless of where the venue is located. Overseas exchanges rarely issue a Japanese-style annual statement, so keeping your own records matters far more. Check National Tax Agency guidance and consult a tax professional.
7 min
Tax and safetyAdvancedA company holding crypto sits under a different tax framework from an individual, with issues specific to corporations such as how holdings are valued at period end. This is also an area that has been revisited, so outdated information circulates. Always check current National Tax Agency guidance and engage a tax professional experienced with corporate tax.
7 min
Tax and safetyIntermediateOn a personal return, an unrealised gain on something you merely hold is generally not itself taxable. Even so, pinning down your year-end quantities is essential as a check on whether the gain calculation is right. Valuation rules differ depending on who is holding, so check National Tax Agency guidance and consult a tax professional.
6 min
Tax and safetyIntermediateWhen computing crypto income, costs incurred directly to earn that income may be considered as deductible expenses. What qualifies, and how far, depends on the income classification and your circumstances — and anything mixed with private use raises the question of how you justify the split. Check National Tax Agency guidance and consult a tax professional.
6 min
Tax and safetyAdvancedThe blue return is an elective system available to people with certain income types, such as business income, on condition that proper books are kept. Because an individual's crypto income is in principle miscellaneous income, that classification sits on different premises from the blue return framework. Whether an activity amounts to a business turns on substance, so consult a tax professional rather than deciding yourself.
6 min
Tax and safetyIntermediateDepending on the previous year, there is a mechanism that can require payment before the filing season. Alongside it, the practical issue is having the money ready. Understand the structure: a liability based on last year's result does not shrink because the market has since fallen. Take the specific criteria and amounts from National Tax Agency guidance and consult a tax professional.
6 min
Tax and safetyAdvancedIf a filed return turns out to be wrong, the procedure differs depending on whether you under-reported or over-reported. Both have deadlines and requirements, and leaving the matter alone can work against you. Check the procedural details in National Tax Agency guidance and handle the actual response with a tax professional.
6 min
Tax and safetyIntermediateMissing the deadline does not mean you cannot file. Consequences attach to the delay, but the situation only deteriorates the longer it is left — and the treatment can differ depending on whether you come forward or respond after being asked. Check National Tax Agency guidance and speak to the tax office or a tax professional as soon as you can.
5 min
Tax and safetyIntermediateFor a crypto return, retaining the history that supports your calculation is essential. Which documents must be kept and for how long is set by the rules, and what counts is whether you can produce them when asked. Save your own copies before an exchange shuts down and the history becomes unreachable. Take periods and requirements from National Tax Agency guidance and consult a tax professional.
6 min
Tax and safetyIntermediateWith a high trade count, calculation software is the realistic choice. Taking its output on trust is not: you need to verify the cost basis setting, check for failed imports, and reconcile against year-end balances. The output is material for your return, not a guarantee of correctness. Check National Tax Agency guidance and take final judgements to a tax professional.
6 min
Tax and safetyIntermediateCrypto gains are not computed venue by venue and left there: for the same asset, the calculation is generally done across every place you hold it. Adding up each exchange's annual statement does not produce a correct cost basis. Check National Tax Agency guidance on aggregation and consult a tax professional.
6 min
Tax and safetyIntermediateLarge amounts, several years, DeFi or overseas venues, or any question of income classification are all reasons to work with a tax professional. The useful moment to consult is when the question arises, not just before the deadline. Individual tax judgements belong with a qualified professional.
6 min
Tax and safetyIntermediateA set of misunderstandings circulates widely: that nothing applies until you convert to yen, that swaps are untaxed, that overseas exchanges need not be reported. None of these match the framework. Filing on a misunderstanding means correcting it later at greater cost. Take the correct framework from National Tax Agency guidance and judgements to a tax professional.
7 min