Bitcoin Taxes in Japan — Misc Income, the 2026 Reform, and Tax Filing

Why Tax Deserves Its Own Topic

• Crypto taxation is not a story about price or technology. It is a story about rules that touch daily life, and in Japan both the rate and the filing procedure have long followed a framework distinct from equities or FX.
• 2026 is the year that framework moved. An amended Income Tax Act introducing separate declaration taxation was enacted in March, and a law moving crypto assets under the Financial Instruments and Exchange Act (FIEA) was enacted in July. But when the new rate takes effect, and for whom, is conditional — a point frequently muddled in coverage.
• This page explains the rules as of August 2026, based on primary sources: the National Tax Agency (NTA), the Ministry of Finance (MOF), the Financial Services Agency (FSA), and the Diet. It is not individual tax advice.
• For how any of this applies to your own transactions, for preparing a return, or for whether a given approach is permissible, consult a certified tax accountant or your local tax office. Figures here reflect the time of writing and may change through cabinet orders and administrative circulars.

The Current Regime — Miscellaneous Income and Progressive Taxation

• What follows is the regime that applies before the start date of the reform described later. After that date the income classification itself changes, so this framework is not permanent.
• The NTA FAQ (item 2-2, revised December 2025) states that gains arising from crypto asset transactions are subject to income tax and are, in principle, classified as miscellaneous income ("other" miscellaneous income).
• Miscellaneous income falls under comprehensive progressive taxation. It is aggregated with salary and other income, then taxed at progressive income tax rates of 5–45%, plus 10% municipal tax and the special reconstruction income tax (2.1% of the income tax amount). The combined top burden is about 55.9% (45% income tax + 0.945% reconstruction surtax + 10% municipal tax), commonly rounded to "roughly 55%." Note that the 2.1% surtax runs only through the 2026 tax year; from the 2027 tax year it becomes 1.1% reconstruction surtax plus a 1% special defense income tax, leaving the combined 2.1% add-on unchanged (NTA Q&A, May 2026).
• There is an exception. Where crypto transaction revenue for the year exceeds ¥3 million, the income is classified in principle as business income if transaction books and records are kept, and as business-related miscellaneous income if they are not.
• Losses computed within miscellaneous income cannot be offset against other income such as salary. Article 69 of the Income Tax Act permits offsetting only for losses from real estate, business, forestry, and capital gains income — miscellaneous income is not among them.
• Carrying losses forward to later years is likewise not permitted under the current regime. This disadvantage relative to listed equities, which enjoy a 20.315% flat rate and a three-year carry-forward, has been the central argument for reform.

When Tax Is Triggered

• Simply holding does not trigger tax. As long as an unrealized gain stays unrealized, no income is recognized; the taxable event arises when crypto is disposed of or received.
• The representative categories in the NTA FAQ are: selling (BTC to yen), spending crypto to buy goods, exchanging one crypto asset for another (BTC to ETH), and donating. That swaps and payments are treated as "sold at the market value of that moment" is the point most often overlooked.
• Where crypto is acquired through mining, staking, or lending, the market value at the time of acquisition is included in gross revenue, and the costs incurred are deductible as necessary expenses (FAQ 1-7). Because acquisition is not a disposal, this income does not enter the separate-taxation bucket described below.
• Where a new crypto asset is acquired through a split (hard fork), no market price existed at that moment and the asset is regarded as having had no value, so its acquisition cost is ¥0 and no tax arises on receipt (FAQ 1-6). Taxation is deferred to the point of sale or use, when the full proceeds become income.
• Airdrops have no dedicated item in the FAQ. In practice the treatment turns on whether a market price exists at the moment of receipt — recognize revenue then, or carry a ¥0 basis forward as with a split. If the answer is unclear, confirm with the tax office or a tax accountant.

Calculating Gains and Losses

• Income is gross revenue minus necessary expenses. Necessary expenses include the cost of the crypto disposed of and sale commissions, plus — only to the extent directly required for the sale — line usage charges and depreciation on equipment such as a PC.
• The acquisition cost underlying that calculation is computed by the total average method or the moving average method. The method is elected per type of crypto asset, and the "Notification of Valuation Method for Crypto Assets (Income Tax)" must be filed by the tax return deadline for the year of first acquisition (in principle March 15 of the following year).
• If no notification is filed, the statutory default is the total average method. Changing it later requires an application for approval and the district director's consent, and the application may be rejected if a reasonable period — three years, absent special reasons — has not elapsed since the current method was adopted.
• Domestic crypto exchange providers issue an "annual transaction report" showing quantities and amounts purchased and sold during the year. The NTA also publishes calculation sheets (Excel) for both the moving average and total average methods.
• Where the acquisition cost genuinely cannot be determined, 5% of the sale price may be used as the acquisition cost. This is relief for missing records, not a planning tool — it is normally unfavorable to the taxpayer.
• Once several exchanges or DeFi are involved, manual calculation stops being realistic. Accounting software and calculation services that handle crypto gains and losses can ingest exchange CSV exports and automate the work, but this site does not recommend any particular provider or service.

Filing in Practice

• A salaried person must file a return where they receive salary from a single employer, all of that salary is subject to withholding, and total income other than employment and retirement income exceeds ¥200,000 (NTA Tax Answer No.1900). Anyone with salary income above ¥20 million must file regardless of amount.
• The so-called "¥200,000 rule" applies to income tax only; there is no equivalent exemption for municipal tax. If you do not file an income tax return, you must separately file a municipal tax return with your city or ward.
• The filing window runs in principle from February 16 to March 15 of the following year (moving to the next business day when it falls on a weekend or holiday). Returns can be submitted electronically via e-Tax through the NTA's online return preparation service.
• What to gather: annual transaction reports and trade-history CSVs from each exchange, records of deposits and withdrawals, receipts for necessary expenses, and your elected valuation method. Overseas exchanges and peer-to-peer trades issue no report, so you must preserve those records yourself.
• Individuals above certain income and asset thresholds report crypto on the Statement of Assets and Liabilities (FAQ 7-1). Note that crypto is not treated as "property located abroad" even when held on an overseas exchange, so it falls outside the Overseas Assets Report (FAQ 7-3).
• From January 1, 2026, Japan's reporting regime for the automatic exchange of non-residents' crypto transaction information — based on the OECD's Crypto-Asset Reporting Framework (CARF) — is in force. Cross-border transparency is trending upward.

The 2026 Reform — What Was Decided, and When It Bites

• The FY2026 Tax Reform Outline, approved by the Cabinet on December 26, 2025, set out taxing capital gains from crypto disposals separately from other income at 20% (15% income tax, 5% individual municipal tax). Adding the reconstruction surtax brings this to 20.315% (the 0.315% being 15% × 2.1%; from the 2027 tax year that 2.1% splits into 1.1% reconstruction and 1% defense surtax, leaving the total unchanged).
• These provisions were folded into the Act Partially Amending the Income Tax Act and Others, enacted and promulgated on March 31, 2026. Provisions creating separate declaration taxation for specified crypto assets, and a carry-forward deduction for losses, were added to the Special Taxation Measures Act — so separate taxation is settled law, not merely a policy direction. For article numbers and subordinate details, check the published statutes themselves.
• The change most often missed is the reclassification of income. Before the reform, crypto gains were miscellaneous income; after it, income from disposing of crypto is organized as capital gains, with disposals of specified crypto assets to eligible operators going into the separate bucket and everything else falling into comprehensively taxed capital gains. That is why the Outline's item (6) speaks of "crypto assets giving rise to comprehensively taxed capital gains."
• Three routes connect to the 20.315% regime. Spot disposals (capital gains, taxed separately); crypto derivative transactions on specified crypto assets (which remain miscellaneous income but are added to the special regime for futures-related miscellaneous income and its three-year loss carry-forward); and beneficial interests in investment trusts holding specified crypto assets (folded into the general-shares regime, premised on an amendment to the order under the Act on Investment Trusts and Investment Corporations). Note that spot and derivative losses carry forward in separate buckets.
• The scope is narrow. Separate taxation applies where a resident disposes of a "specified crypto asset" — one whose name is entered in the register of financial instruments business operators — to a crypto asset trading business operator, including disposals made through a sale entrusted to such an operator. What matters is the route of the disposal, not how the asset was acquired: a specified crypto asset obtained by mining or airdrop still qualifies when sold through a registered domestic operator. Disposals via overseas exchanges, DEXs, and peer-to-peer trades stay outside, and the revenue recognized on acquisition through mining and similar activity (FAQ 1-7) remains comprehensively taxed because it is not a disposal.
• On losses, any amount that cannot be absorbed in the year may be carried forward for three years against capital gains on specified crypto assets. The carry-forward is confined to that same bucket; no provision allows offsetting against gains and losses on listed equities.
• Crypto that stays outside the bucket also gets specific treatment: the capital gains special deduction will not apply, the 50% inclusion for assets held more than five years will not apply, and losses will not be offsettable against other comprehensively taxed income. These are cancelling measures made necessary precisely because the income is now capital gains — "all crypto is now taxed at 20%" is not an accurate reading.
• The start date is set as January 1 of the year following the year in which the amended FIEA takes effect. That FIEA amendment was enacted on July 15, 2026 and promulgated on July 23; the crypto provisions take effect on a date set by cabinet order within one year of promulgation, meaning July 22, 2027 at the latest. Enforcement during 2026 would put the start at January 1, 2027; enforcement in 2027 puts it at January 1, 2028. As of August 2026 no cabinet order fixing the date has been promulgated, so it is not settled — but as a matter of law it cannot fall later than January 1, 2028.

Corporate Holdings

• Crypto assets held by a corporation at fiscal year end that qualify as "crypto assets with an active market" must in principle be valued by the mark-to-market method, with the difference between valuation and book value recognized as income or expense (Corporation Tax Act, Article 61). Taxing unrealized gains has been seen as an obstacle to long-term corporate holding.
• The FY2023 reform removed "specified self-issued crypto assets" — those a corporation issued itself and has held continuously since issuance — from year-end mark-to-market valuation.
• The FY2024 reform extended relief to assets issued by others: where a defined transfer restriction is attached and the exchange provider has completed the disclosure procedure through the certified funds-transfer business association ("specified transfer-restricted crypto assets"), the corporation may elect between mark-to-market and cost. Absent an election, the statutory default is the cost method.
• Consumption tax is also addressed in the FY2026 Outline: crypto disposals would remain exempt but be reclassified as disposals of assets similar to securities, with 5% of the consideration included in the taxable sales ratio calculation. Unlike the income tax measures, however, this was not part of the law enacted in March 2026 — it sits at the Outline stage and awaits a future tax reform act. It would apply from January 1 of the year following the amended FIEA's enforcement, and reaches consumption taxpayers generally, not only corporations.
• Corporate rules differ substantially from those for individuals. If you are considering holding or operating crypto through a company, discuss year-end valuation and accounting treatment with a tax accountant.

Inheritance and Gift — The Basics

• Crypto assets constitute "property with economic value that can be measured in money," so acquiring them by inheritance, bequest, or gift triggers inheritance tax or gift tax (FAQ 4-1).
• For valuation, a crypto asset with an active market is valued at the trading price published, at the time of the taxable event, by the exchange provider the taxpayer transacts with (FAQ 4-2) — treatment analogous to foreign currency. Without an active market, valuation is individual, weighing the asset's nature and actual trading conditions.
• The hard case is when private keys or seed phrases were never passed to the family. Tax treatment follows the valuation circulars, but without the keys nothing can actually be moved. Technical loss and the existence of taxable property do not automatically move together — that is the practical tension.
• The remedy is estate design rather than tax planning. An inventory of which exchange or wallet holds what, how the keys are stored, and how that will reach the family, written down while you are alive, is the starting point.
• Inheritance tax rates, the basic exclusion, and the filing deadline (in principle ten months from the day after you learn the inheritance has commenced) are beyond this page's scope. Any specific estate matter should go to a tax accountant.

How Other Countries Compare

• Treatment varies widely across jurisdictions. What follows is a compact view of representative frameworks based on published material as of August 2026. Details change annually, so verify against each authority's own materials.

• In the United States, the IRS treats digital assets as property rather than currency, recognizing gain or loss on sale, exchange, or disposal. That the rate turns on a one-year holding threshold — short-term versus long-term — has no Japanese equivalent.
• Germany treats crypto as a private sale transaction under §23 of the Income Tax Act, with gains on assets held more than one year not taxed. In July 2026, however, the German federal government's key-figures decision for the 2027 budget proposed scrapping that one-year rule and taxing crypto as investment income; as of August 2026 this remains a proposal with no bill before parliament.
• Singapore has no capital gains tax at all; income tax reaches trading only where it amounts to carrying on a business.
• The comparison shows that the tax burden is decided by which box a crypto asset is placed in. Japan's 2026 reform is exactly that: tax rules following the move of crypto from a means of payment under the Payment Services Act into a financial instrument under the FIEA.

Summary — Settled, Expected, Undecided

• Because this area invites confusion, here is where each question stands as of August 2026.

• Overseas exchanges are a conditional case: a disposal routed through a provider registered in Japan can fall inside the bucket, while a disposal to an unregistered overseas operator is expected to stay outside.
• The headline "crypto tax is now 20%" is correct as a statement about the statute and inaccurate as a statement about when and to whom it applies. The start date is tied to the FIEA amendment's enforcement, and the scope is limited to disposals of specified crypto assets through licensed operators.
• To check the primary sources yourself, start with the NTA's crypto tax treatment FAQ and calculation sheets, the MOF's FY2026 Tax Reform Outline and its page on bills submitted to the Diet, the FSA's explanatory material on the bill, and the House of Councillors' bill record. All are linked at the foot of this page.
• To repeat: this page explains the rules; it is not individual tax advice. For your own filing, consult a certified tax accountant or your local tax office.