Japan has both a tax treaty and a totalization agreement — so the credit usually beats the exclusion.
Japan is the opposite of a Gulf posting. National income tax reaches 45%, local inhabitant tax adds around 10%, and there is a US treaty and a totalization agreement. That combination usually makes the foreign tax credit better than the Foreign Earned Income Exclusion, and it can relieve US self-employment tax entirely.
Tax snapshot — Japan
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Sources: IRS Publication 54; IRS Publication 901; US–Japan income tax treaty (2003, as amended); US–Japan totalization agreement (2005); Rev. Proc. 2025-32. Checked 28 August 2026.
What that means on your return
With an effective rate well above the US equivalent, Form 1116 normally leaves you with excess credits to carry forward, and it keeps your income counted as compensation — which matters if you want to fund an IRA. The exclusion would remove the income and the ability to contribute with it.
Inhabitant tax is assessed on the previous year's income and billed in the following June, which puts the payment in a different US tax year from the income it relates to. Getting the timing right on Form 1116 is where Japanese returns most often go wrong.
The totalization agreement means you generally pay into one system rather than both. For a self-employed American covered by Japanese pension insurance, that removes the 15.3% SECA charge — but it needs a certificate of coverage, not an assumption.
If you are in Japan as a…
Questions I get about Japan
Do I pay US self-employment tax in Japan?
Usually not, because the totalization agreement assigns coverage to one country. Where you are covered by the Japanese system, US SECA does not apply — but you need the certificate of coverage to show it.
When do I claim my inhabitant tax on the US return?
In the year it is paid or accrued, depending on the method you elect — and it is billed the June after the income year, so it rarely lines up with the salary it relates to. That mismatch is worth planning rather than discovering.
Should I claim the exclusion or the foreign tax credit in Japan?
It turns on your effective local rate. Where local tax is high the credit usually beats the exclusion and leaves your income counted for IRA purposes; where it is low the exclusion usually wins. Revoking the exclusion binds you for five years without IRS consent, so it is decided deliberately — that comparison is what the position review is for.
When is my return due?
15 June, under the automatic extension for filers living abroad. Form 4868 moves it to 15 October, and I file the extension free.
Do I have to file an FBAR for my Japanese bank account?
If your foreign accounts together passed $10,000 at any point in the year, yes. You can file it free through FinCEN's own system. The non-willful penalty for not filing is $16,536.
I have not filed for several years. What now?
The Streamlined Foreign Offshore Procedures: three returns, six FBARs and Form 14653 certifying non-willfulness. Penalties are waived. Note that the IRS terminated the separate Delinquent FBAR Submission Procedures around 1 July 2026.
Filing from Japan this year?
Twenty minutes with the Enrolled Agent who will prepare and sign it. Complete return, $599.
An IRS Enrolled Agent working only on US tax for Americans living abroad. I prepare and sign every return myself — 17 years in practice, 12 of them as an Enrolled Agent.