Meet iDeCo, Japan’s Answer to a 401(k)

If you’ve heard about tax-advantaged retirement accounts and wondered whether there’s a Japanese equivalent worth using, the answer is yes — it’s called iDeCo (individual-type Defined Contribution pension), and for most foreign residents working in Japan, it’s genuinely accessible.

What Makes iDeCo Different From a Tax Credit

Unlike a tax credit that offsets tax you’d otherwise owe, iDeCo contributions are fully deductible from your taxable income — reducing both your national income tax and your resident tax (住民税) for the year. The more you contribute (up to your cap), the lower your taxable income becomes.

Are Foreign Residents Actually Eligible?

Nationality doesn’t matter — iDeCo eligibility follows your enrollment in Japan’s public pension system, either the National Pension (国民年金) or Employees’ Pension (厚生年金). Most foreign residents working in Japan are already enrolled, so most can open an iDeCo account. There are exceptions, set out in Article 62 of the Defined Contribution Pension Act:

• If you’re exempt from National Pension premiums, you can’t join. That covers full and partial exemptions and the student payment deferral (学生納付特例) — which many international students use.
• Company employees who make matching contributions to their employer’s DC plan can’t also join iDeCo.
• You need to live in Japan. Moving abroad ends your eligibility as a foreign national.

How Much You Can Contribute — Now and From December 2026

The 2025 pension reform raises the caps from December 1, 2026 (the new limits apply from December 2026 contributions, which are debited in January 2027).

Category	Monthly cap now	From December 2026
Self-employed, freelancers, students paying premiums (Category 1)	JPY 68,000 (combined with the National Pension Fund)	JPY 75,000 (combined)
Company employees, no employer pension plan	JPY 23,000	JPY 62,000
Company employees with an employer DC or DB plan	JPY 20,000 (JPY 55,000 combined with the employer plan)	JPY 62,000 combined with the employer plan
Dependent spouses (Category 3)	JPY 23,000	JPY 23,000 (unchanged)

Figures are from the MHLW’s comparison of current and revised limits. The same reform lets some people aged 60 to 69 keep contributing: those who aren’t National Pension insured but are existing iDeCo members (or are moving money in from a company plan) and haven’t started receiving the old-age basic pension or iDeCo benefits. For the first three years, other people in that age range can join too.

One Thing to Watch If You Plan to Leave Japan

iDeCo money is normally locked until age 60. If you leave Japan earlier, the only way to take it out is iDeCo’s own withdrawal lump sum (脱退一時金), and you have to meet all of its conditions, including:

• You’re under 60 and can no longer join iDeCo (for example, you’ve moved out of Japan as a foreign national)
• Your total contribution period is 5 years or less, or your account balance is JPY 250,000 or less
• You claim within 2 years of losing your membership

If you’ve contributed for more than 5 years and hold more than JPY 250,000, expect the money to stay invested until 60 — factor that in before you start.

Don’t confuse this with the public pension lump-sum withdrawal, which is a separate system. The 2025 reform law will stop paying the public pension lump sum while a re-entry permit is still valid and raise its cap from 5 to 8 years, but that takes effect on a date set by cabinet order within four years of the law. As of September 2026, the Japan Pension Service’s current requirements still use the 5-year cap and don’t include the re-entry permit rule.

Quick Summary

Item	Detail
Tax benefit	Full income deduction on contributions, reducing income tax and resident tax
Eligibility	Tied to public pension enrollment; not available if you’re exempt from National Pension premiums (including the student deferral)
Contribution caps (from Dec 2026)	Self-employed: JPY 75,000/month; employees: JPY 62,000 combined with any employer plan; dependent spouses: JPY 23,000
Age eligibility (from Dec 2026)	Some people aged 60–69 can keep contributing (conditions apply)

This article is for general informational purposes only. Eligibility, contribution limits, and tax treatment depend on your specific employment and pension enrollment category. Always confirm current rules with your pension office, employer, or a licensed financial advisor before enrolling.