After moving back to Japan from the United States, you may still receive U.S. salary or bonuses, dividends and gains on U.S. stocks, rent from a U.S. property you kept, and eventually distributions from a 401(k) or IRA. The year of return is the most error-prone year of all, because your status switches from resident to nonresident in the U.S. and from nonresident to resident in Japan partway through the year. This article explains how a returning resident reports U.S.-source income in Japan, how the Japanese foreign tax credit and its limitation work, the exchange rate rules, the treatment of each type of income, and the overseas asset reporting requirements. Rules are as of 2026.
A Resident from the Day You Return: Worldwide Income Becomes Taxable in Japan
A Japanese national becomes a resident (permanent resident category) for Japanese income tax purposes on the day he or she establishes a domicile in Japan, and from that day worldwide income, including U.S.-source income, is taxable in Japan. The year of return is split into a nonresident period (January 1 to the return date, during which only Japan-source income is taxed) and a resident period (from the return date, worldwide income), both reported on a single return. From the following year you file as an ordinary resident between February 16 and March 15.
The Foreign Tax Credit: How Double Taxation Is Relieved
When U.S. tax has been paid on U.S.-source income that Japan also taxes, the Japanese foreign tax credit (Income Tax Act Article 95) offsets the double tax. The credit is limited as follows:
Income tax credit limit = income tax for the year x (foreign-source income for the year / total income for the year)
- Foreign tax exceeding the income tax limit can be credited against the special reconstruction income tax and then against inhabitant tax (prefectural and municipal) within their own limits.
- Excess foreign tax that still cannot be credited, and unused credit capacity, can each be carried forward for three years.
- Creditable taxes are foreign taxes equivalent to income tax. U.S. federal income tax qualifies, and so does state income tax. U.S. Social Security tax and property tax do not.
- The credit is generally claimed in the year the foreign tax becomes payable: the date of withholding for withheld taxes, or the date the liability is fixed by a return for self-assessed taxes.
- Attach the foreign tax credit statement to the return and keep evidence such as Forms 1042-S, 1099, and a copy of Form 1040-NR.
Timing gap between the U.S. and Japanese returns
The U.S. return after your return to Japan (Form 1040-NR) is due April 15 or June 15 of the following year, later than the Japanese deadline of March 15. Because the final U.S. tax is not yet fixed when the Japanese return is due, the usual practice is to claim the credit based on withheld amounts and then adjust through a request for correction (within five years) or the three-year carryforward once Form 1040-NR is finalized.
Exchange Rates: Which Rate to Use
Dollar-denominated income and costs are converted to yen. The general rule is the telegraphic transfer middle rate (TTM) on the transaction date, but for sales of shares and similar securities, sale proceeds are typically converted at the buying rate (TTB) on the sale date and cost at the selling rate (TTS) on the purchase date. When the yen has weakened, a dollar loss can become a yen gain and vice versa. If you plan to sell U.S. stocks after returning, assemble the purchase dates and historical rates now, since the yen cost basis will be needed.
Treatment by Type of Income
| Type of income | Classification and taxation in Japan | U.S. side and foreign tax credit |
|---|---|---|
| U.S. salary or bonus received after return (for U.S. work) | Employment income, aggregate taxation, if the payment date falls in the resident period | The portion attributable to U.S. workdays is U.S.-source and reported on Form 1040-NR; U.S. tax is creditable |
| RSUs and stock options vesting or exercised after return | Employment income, aggregate taxation | U.S. tax on the U.S. workday portion; relieved by the credit |
| Dividends on U.S. stocks | Dividend income (separate taxation at 20.315% or aggregate) | Update Form W-8BEN with your Japanese address for the 10% treaty rate; creditable |
| Gains on sale of U.S. stocks | Capital gains, separate taxation at 20.315%, computed in yen | Generally not taxed in the U.S. for nonresidents; no credit needed |
| Interest on U.S. bank deposits | Interest income taxed on an aggregate basis, unlike domestic deposits | Not taxed in the U.S. for nonresidents |
| Rent from U.S. real estate | Real estate income; depreciation recomputed under Japanese rules; loss offset restriction for overseas used buildings | Net election on Form 1040-NR; U.S. tax creditable |
| Gain on sale of U.S. real estate | Capital gains, separate taxation (long-term 20.315%, short-term 39.63%) | Taxed in the U.S. with 15% FIRPTA withholding; U.S. tax creditable |
| 401(k) and IRA distributions | Classified as miscellaneous income (public pension type), retirement income, or occasional income depending on the form of payment; treatment is often contested | Under the treaty, generally taxable only in the country of residence (Japan); if U.S. tax is withheld, claim treaty benefits or a refund |
Overseas Asset Report and Asset and Liability Report
A resident who holds overseas assets worth more than 50 million yen on December 31 (U.S. bank accounts, stocks, real estate, retirement accounts, and so on) must file an overseas asset report by June 30 of the following year. Filing reduces penalties on any related underreporting, and failing to file increases them. Separately, an asset and liability report is required for those with income above 20 million yen and total assets of 300 million yen or more (or securities of 100 million yen or more), among other cases. At the first year-end after your return, value the assets you left in the U.S. in yen and check whether these thresholds are met.
Keep the U.S. Side in Step
- The U.S. return for the year of return is a dual-status return: Form 1040 for the resident period and Form 1040-NR for the nonresident period.
- File Form W-8BEN with your U.S. brokerage to claim the treaty rate of 10% on dividends as a resident of Japan.
- If you keep a U.S. rental property, continue the net election on Form 1040-NR and do not forget the state return.
- Long-term green card holders who surrender their cards, and former citizens, must file Form 8854 and apply the exit tax rules.
Frequently Asked Questions
I sold U.S. stocks after returning. The U.S. did not tax the gain, but does Japan really tax it at 20%?
Yes. Under the treaty, gains on shares are taxable only in the country of residence, so Japan taxes them at 20.315% under separate taxation. Because the cost basis is converted at the purchase-date rate, a weaker yen can inflate the yen gain. With no U.S. tax paid, there is no foreign tax credit.
My U.S. tax is not yet finalized. What do I put on the Japanese return?
Claim the credit based on the tax withheld (as shown on Forms 1042-S or 1099), then adjust through a request for correction or the carryforward once Form 1040-NR fixes the final amount. Keep all supporting documents and work with an adviser.
I left my 401(k) in the U.S. Do I need to report anything?
It is not taxed in Japan until you take a distribution, but the balance can count toward the overseas asset report. In the year of a distribution you must report it in Japan, and the classification depends on how it is paid, so confirm the treatment before withdrawing.
This article is provided for general informational purposes only and does not constitute individual tax advice. Please review current Japanese tax law and IRS rules, and consult qualified tax professionals in both countries before acting.
Summary
From the day you return, Japan taxes your worldwide income, and U.S. tax on U.S.-source income is relieved through the foreign tax credit, which is subject to a limit, a three-year carryforward, and a further credit against inhabitant tax. Each type of income is classified differently in Japan, some of it is not taxed in the U.S. at all, and exchange rate rules can transform the result. Given that the U.S. filing deadline falls after Japan’s, organizing your W-2s, Forms 1042-S and 1040-NR, and historical exchange rates before you leave the U.S. is the surest path to an accurate return.
Related Articles
- The Definitive Guide to Filing US Tax Returns (1040/1040NR) from Japan After Repatriation: Procedures, Payment, and Refund Methods
- Withdrawing a 401(k) or IRA After Returning to Japan: 30% Withholding and Relief Under the US-Japan Tax Treaty
- US-Japan Pension Taxation and Tax Treaty Articles 17 & 18: A Comprehensive Guide to the “Taxable Only in Japan” Rule for US Pensions (401k/IRA) for Japanese Residents and Dual Taxation Avoidance
- Unrealized Forex Gains and Section 988: Tax Risks of ‘Phantom Gains’ from Yen Depreciation and Exemption Rules
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