iDeCo for Foreign Residents in Japan: Eligibility, Tax Break & the Leaving-Japan Catch

Quick answer (30 seconds): iDeCo (個人型確定拠出年金) is Japan's private, tax-advantaged retirement account. Foreign residents can join if they pay into the Japanese pension (National Pension or Employees' Pension) and are within the age range. The big upside: your contributions are fully income-tax-deductible, cutting your income and resident tax every year. The big catch — especially for foreigners — is that the money is locked until age 60, and you generally CANNOT cash it out just because you leave Japan (unlike the National Pension's lump-sum refund). If you're unsure how long you'll stay, read the "leaving Japan" section before you open one.

Disclaimer: General information, not financial or tax advice. Rules, limits, and the joining age are changing in 2026–2027 and depend on your situation — confirm current details with the official iDeCo site / your provider, and consider a tax accountant (税理士) or financial planner.

What iDeCo is (and how it differs from NISA)

iDeCo is a defined-contribution pension: you choose investments, they grow tax-free inside the account, and you draw on them in retirement. It pairs with NISA, but the trade-offs are opposite:

	iDeCo	NISA
Income-tax deduction on contributions	✅ Yes (big annual saving)	❌ No
Tax-free growth	✅ Yes	✅ Yes
Withdraw anytime	❌ No — locked until 60	✅ Yes
Best when	You'll stay long-term & want the tax break	You want flexibility / may leave Japan

For many foreigners who don't know how long they'll be in Japan, NISA is the more flexible starting point (see the related NISA guide). iDeCo shines if you're settled and want the up-front tax deduction.

Can foreign residents join?

Yes, if you meet the basics: