SEISEI INSIGHTS — Cross-border Compliance
The Annual Compliance Calendar for Wealth Holders: What "Filing Once a Year" Overlooks
2026-07-01
"I take care of taxes once a year, at the March filing." We hear this constantly from foreign residents who earn income in Japan and hold assets back home. The annual income tax return is indeed the centerpiece of the year — but for anyone whose income and assets span multiple countries, obligations do not collapse into the single date of March 15. Across the year run several parallel filing and reporting duties, each with its own statutory basis and its own set of obligated persons. This article sets out that full picture as a structure.
Obligations Do Not Converge on a Single Deadline
Under Japanese tax law, the income tax return (Income Tax Act, Art. 120) is filed each year between February 16 and March 15. That is the starting point, not the finish line. Payers of salaries and fees must submit statutory payment records (Income Tax Act, Art. 225); those who receive gifts within a calendar year incur a gift tax filing obligation (Inheritance Tax Act, Art. 28); and holders of a company add the corporate tax return after the close of the business year (Corporation Tax Act, Art. 74).
Where assets cross borders, the reporting regimes stack on top of all this. Each obligation is independent — discharging one does not exempt the others.
| Timing (each year) | Principal obligation | Statutory basis |
|---|---|---|
| January 31 | File statutory payment records (salary/fee records) | Income Tax Act, Art. 225 |
| February 16 – March 15 | File the income tax return | Income Tax Act, Art. 120 |
| By March 15 | File gift tax on the prior year's calendar-year gifts | Inheritance Tax Act, Art. 28 |
| June 30 | File the Overseas Assets Report | Overseas Wire Transfer Reporting Act, Art. 5 |
| June 30 | File the Assets and Liabilities Report | Overseas Wire Transfer Reporting Act, Art. 6-2 |
| Within 2 months of business-year end | File the corporate tax return | Corporation Tax Act, Art. 74 |
| December | Year-end adjustment for salary earners | Income Tax Act, Art. 190 |
Two Reports Converge on June 30
The date most easily overlooked is June 30 — the filing deadline for two distinct reporting regimes.
First, the Overseas Assets Report. A resident (excluding non-permanent residents) whose overseas assets exceed ¥50 million in aggregate value as of December 31 must file the report by June 30 of the following year (Overseas Wire Transfer Reporting Act, Art. 5).
Second, the Assets and Liabilities Report. Where total income plus timber income for the year exceeds ¥20 million, and the taxpayer holds assets worth ¥300 million or more — or ¥100 million or more in securities subject to the exit-tax regime — as of December 31, this report is likewise required (same Act, Art. 6-2).
One structural point deserves particular attention. The deadline for the Overseas Assets Report was moved, by the 2020 tax reform, from the former March 15 to June 30. Anyone still operating on the memory of "the same day as the income tax return" risks handling — at the wrong time — a report for which preparation time in fact remains. In the annual plan, it should be positioned as a deadline separate from the income tax return.
Home-country regimes may also carve out a mid-year filing duty. Chinese tax residents, for instance, are subject to an annual reconciliation of the prior year's comprehensive income that falls around mid-year. Anyone earning income in both Japan and a home country should map both systems' deadlines onto a single calendar as the starting point.
The Authorities Do Not Rely on Self-Disclosure Alone
These reporting regimes are not built solely on voluntary disclosure. Under the Common Reporting Standard (CRS), reporting financial institutions are obliged to report account information for specified persons as of December 31 (Act on Special Provisions for the Implementation of Tax Treaties, Art. 10-6), and account holders are required to declare their place of residence and related details at account opening (same Act, Art. 10-5). The financial account information so collected is then exchanged automatically between national tax authorities.
In short, overseas account balances and interest income reach the authorities regardless of whether the holder files. The baseline, in ordinary times, is that what you file and what is exchanged are consistent.
Treat It as a Structure
In our experience, most problems around annual obligations arise not from concealment but from failing to grasp that several deadlines run in parallel. Three things to confirm:
- Which filing and reporting obligations apply to you — they differ across income, assets, gifts, and corporate entities.
- When each falls due — the income tax return (March) and the various reports (June) are not the same thing.
- Whether they overlap with home-country deadlines — both calendars need to be consolidated into one.
Mapping residency status, asset locations, and each country's filing deadlines onto a single annual structural diagram is the foundation of compliance for anyone holding assets internationally.
This article provides general information on tax systems and does not constitute individual tax consultation. Specific filings and tax computations are handled by licensed partner tax accountants whom we introduce.