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How to Avoid Double Social Security Payments
Japan has totalization agreements with 24 countries to prevent double pension payments for posted workers. Here’s how the Certificate of Coverage works.
iDeCo for Americans in Japan (2026)
A practical guide to Japan’s iDeCo for foreign residents — eligibility, contribution limits, and the PFIC, FBAR, and FATCA reporting most guides skip.
Japan iDeCo Tax Deduction Calculator (2026)
Enter your taxable income, contributor type, and monthly contribution to estimate your annual tax savings from Japan’s iDeCo pension system.
US 401(k) / IRA Tax Savings Calculator (2026)
Enter your income and planned 401(k) or IRA contributions to estimate your US federal tax savings for the year, based on current brackets.
Japan Pension Refund Calculator (2026)
Enter your enrollment period and average pay to estimate the lump-sum pension refund you can claim after leaving Japan.
Meet iDeCo, Japan’s Answer to a 401(k)
Japan’s iDeCo lets most working foreign residents deduct retirement contributions from taxable income. Here’s how eligibility and contribution caps work.