NISA vs iDeCo: Which Is Better for Foreigners in Japan?
Last updated: February 2026
If you've been researching investment options in Japan, you've encountered two acronyms repeatedly: NISA and iDeCo. Japanese financial advice almost universally recommends using both. But that advice is written for people who plan to live and retire in Japan — and if that's not your situation, the calculus changes dramatically.
The core issue is simple: iDeCo locks your money until age 60. If you're a foreign resident who may leave Japan in 5, 10, or 15 years, that lock-up is a deal-breaker in most scenarios. NISA, by contrast, lets you withdraw anytime with zero penalty, and you can sell everything tax-free before departure.
This article compares both systems through the lens of a foreign resident, covers the special withdrawal rules that apply to non-Japanese nationals leaving the country, and provides clear guidance on which to prioritize based on your situation.
→ Related: NISA Explained: Japan's Tax-Free Investment Account for Foreign Residents
Disclaimer: This article is for informational purposes only and does not constitute investment, tax, or legal advice. Tax treatment varies by individual circumstance. Consult a qualified tax advisor or financial planner for guidance tailored to your situation.
How the Two Systems Compare
NISA at a Glance
Purpose: General wealth building through tax-free investing. Tax benefit: Investment gains and dividends are completely tax-free. Annual limit: ¥3.6 million (¥1.2M Tsumitate + ¥2.4M Growth). Lifetime limit: ¥18 million (by book value). Withdrawals: Anytime. No penalties, no restrictions, no waiting periods. Eligibility: Japanese tax resident aged 18+. When you leave Japan: Account closes; holdings transfer to a taxable account.
iDeCo at a Glance
Purpose: Retirement savings (private pension supplement). Tax benefit: Triple tax advantage — (1) contributions are fully deductible from taxable income, (2) investment gains are tax-free during accumulation, (3) withdrawals qualify for retirement income deduction or public pension deduction. Annual limit: Varies by employment type. Company employees without employer pension: ¥23,000/month (¥276,000/year). Self-employed: ¥68,000/month (¥816,000/year). Public servants: ¥12,000/month (¥144,000/year). Withdrawals: Not until age 60. Early withdrawal is possible only under extremely strict conditions. Eligibility: National Pension subscriber (Category 1, 2, 3, or voluntary). When you leave Japan: Cannot be cancelled easily. Non-Japanese nationals may qualify for a lump-sum withdrawal (see below).
Why This Decision Is Different for Foreigners
Liquidity: The Fundamental Divide
NISA lets you access your money whenever you need it. Departing Japan next month? Sell your NISA holdings today, receive the proceeds in two to three business days, transfer to your bank, done. No penalties, no tax on gains, no complications.
iDeCo locks your money until you turn 60. If you join at 30, that's a 30-year lock-up. If you leave Japan at 35, your iDeCo funds sit in a Japanese account for another 25 years, accruing modest management fees, until you can claim them. For someone who doesn't plan to grow old in Japan, this is an enormous constraint.
What Happens When You Leave
With NISA, the exit is clean. Sell everything in your NISA account before departure — gains are tax-free. Transfer the cash home. Your NISA chapter in Japan closes with no loose ends.
With iDeCo, departure creates a complex situation. You can't simply withdraw your money because you're leaving. For non-Japanese nationals, there is a special lump-sum withdrawal provision, but it has strict conditions. If you don't qualify, your money stays locked in Japan until age 60.
The Tax Benefit Mismatch
NISA's tax advantage is on the exit — your investment gains are never taxed. This benefit is fully realized regardless of how long you stay in Japan, as long as you sell within the NISA account before your account closes.
iDeCo's biggest tax advantage is on the entry — your contributions reduce your taxable income, saving you income tax and resident tax every year. But this benefit only works while you're a Japanese tax resident. The moment you become a non-resident, the income deduction disappears. If you leave Japan after 5 years of iDeCo contributions, you got 5 years of tax deductions but now face decades of lock-up with no ongoing tax benefit.
The Lump-Sum Withdrawal: iDeCo's Exit Door for Non-Japanese
This is the single most important section for foreign residents considering iDeCo.
iDeCo cannot normally be withdrawn before age 60. However, a special provision exists for individuals who meet all of the following conditions:
- Under age 60
- Not enrolled in an employer-sponsored defined contribution pension
- Not eligible to join iDeCo (non-Japanese nationals living abroad meet this criterion)
- Not a Japanese national living overseas aged 20–59 (non-Japanese nationals meet this by definition)
- Total contribution period of 5 years or less, OR total account balance of ¥250,000 or less
- Not receiving disability benefits from defined contribution pension
- Within 2 years of losing iDeCo enrollment eligibility
For non-Japanese nationals departing Japan, conditions 3 and 4 are automatically satisfied. The critical hurdles are condition 5 (contribution period or balance) and condition 7 (the 2-year deadline).
What This Means in Practice
If you contributed to iDeCo for 5 years or less: You can likely withdraw everything as a lump sum after leaving Japan, provided you apply within 2 years of departure.
If you contributed for more than 5 years AND your balance exceeds ¥250,000: You do not qualify for the lump-sum withdrawal. Your money is locked until age 60. You become a "management-only member" (運用指図者), and account management fees of roughly ¥66–171 per month continue to be deducted from your balance indefinitely.
The Withdrawal Process
After departing Japan: contact your iDeCo management institution (financial institution), submit a membership loss notification to become a management-only member, then submit the lump-sum withdrawal request. You'll need documentation proving your residence status during your iDeCo enrollment period (copy of residence card, etc.). Note: temporary departures under re-entry permits do not qualify.
The lump-sum withdrawal is subject to 20.42% income tax (including reconstruction surtax) withheld at source. Depending on your home country's tax treaty with Japan, you may be able to credit this against your domestic tax liability.
Priority by Situation
Staying Less Than 5 Years → NISA Only
If your time horizon in Japan is under 5 years, iDeCo makes little sense. You'd get a few years of income tax deductions, but then face 20.42% withholding on the lump-sum withdrawal. NISA gives you tax-free gains with complete flexibility, no withholding, and a clean exit. The choice is straightforward.
Staying 5–10 Years → NISA First, iDeCo With Caution
This is the tricky zone. If you contribute to iDeCo for more than 5 years and accumulate over ¥250,000, you lose access to the lump-sum withdrawal. Your funds are then locked until 60.
Prioritize filling your NISA quota (up to ¥3.6 million per year). Only consider iDeCo if you've maxed out NISA and have additional investable income — and even then, be aware that crossing the 5-year contribution threshold permanently changes your exit options.
One strategy: contribute to iDeCo for exactly 5 years, then stop contributing and let it sit. If you leave Japan after year 6 or 7 but contributed for only 5 years, you still qualify for the lump-sum withdrawal (assuming you apply within 2 years of leaving).
Planning to Stay Permanently → NISA + iDeCo Together
If Japan is your long-term home, there's no reason to avoid iDeCo. The 60-year lock-up is irrelevant if you plan to retire here. The triple tax benefit — deductible contributions, tax-free growth, favorable withdrawal taxation — makes iDeCo a powerful complement to NISA.
Recommended order: first, fill your NISA Tsumitate quota (¥100,000/month). Then contribute to iDeCo up to your limit. Then use the NISA Growth quota for additional investing. This sequence prioritizes liquidity (NISA funds remain accessible for emergencies) while capturing iDeCo's income deduction.
High Income, Any Duration → Consider iDeCo for Tax Savings
If your marginal tax rate is high (income tax 23%+ plus 10% resident tax = 33%+), iDeCo's income deduction delivers significant annual savings. At ¥23,000/month, a 33% marginal rate means roughly ¥91,000 per year in reduced taxes. Over 5 years, that's ¥455,000 in tax savings — real money returned to you each year.
But weigh this against the lock-up risk. If you end up staying more than 5 years and can't withdraw the lump sum, those tax savings are offset by decades of illiquidity. High earners with uncertain timelines might consider contributing just enough to stay under the 5-year or ¥250,000 threshold.
iDeCo's Hidden Costs
Beyond the investment product fees (expense ratios), iDeCo carries system-level charges:
Enrollment fee: ¥2,829 (one-time, paid to the National Pension Fund Association). Monthly account management (while contributing): At least ¥237/month (¥171 to NPFA + ¥66 to trust bank). Some institutions add their own fees on top. Monthly account management (management-only, no contributions): At least ¥66/month. Withdrawal fee: ¥440 per payment.
Even after you stop contributing — whether by choice or because you've left Japan — the monthly management fee continues to erode your balance. Over 10 years as a management-only member, that's roughly ¥8,000–20,000. Not catastrophic, but meaningful on a small balance.
A Concrete Comparison
Let's put numbers to the comparison. Assume a company employee earning ¥6 million/year (marginal tax rate ~30% combined income + resident tax), investing for 5 years at 5% annual return, then leaving Japan.
NISA Scenario
Invest ¥100,000/month for 5 years = ¥6,000,000 total. At 5% annual return, portfolio grows to approximately ¥6,800,000. Gain of ¥800,000 is entirely tax-free. Sell before departure: ¥6,800,000 in hand.
iDeCo Scenario
Contribute ¥23,000/month for 5 years = ¥1,380,000 total. At 5% return, balance grows to approximately ¥1,570,000. Gain of ¥190,000.
Tax savings from deductions: ¥23,000 × 12 × 30% = ¥82,800/year × 5 = ¥414,000. Account fees over 5 years: approximately ¥14,000. Lump-sum withdrawal tax: (¥1,570,000 − ¥1,380,000) × 20.42% ≈ ¥38,800.
Net benefit from iDeCo: ¥414,000 (tax savings) − ¥14,000 (fees) − ¥38,800 (withdrawal tax) = approximately ¥361,000.
The Verdict
NISA: ¥800,000 tax-free gain on ¥6M invested — massive capacity, full liquidity, zero complications. iDeCo: ~¥361,000 net benefit on ¥1.38M contributed — meaningful percentage return, but far smaller scale and conditional on qualifying for the lump-sum withdrawal.
The optimal approach: maximize NISA first, then add iDeCo if you have remaining capacity and your timeline supports it.
Common Questions
"If I leave Japan with money stuck in iDeCo, can I still claim it at 60?"
Yes, in principle. Non-Japanese non-residents can request old-age benefits from iDeCo at age 60+. However, as a non-resident, you won't receive the retirement income deduction or public pension deduction that reduces the tax burden for Japanese residents. Instead, 20.42% withholding tax applies to the full amount. If your country has a tax treaty with Japan that includes a retirement pension provision, Japan's tax may be waived — but you'll need to file the appropriate treaty forms and consult a tax professional.
"Can I keep contributing to iDeCo while living overseas?"
Only if you remain enrolled in Japan's pension system — either through continued enrollment in Employees' Pension (厚生年金) via a Japanese employer, or through voluntary enrollment in National Pension (国民年金任意加入). If neither applies, you become a management-only member and contributions stop.
"Are the same funds available in both NISA and iDeCo?"
iDeCo's fund selection is more limited and varies by institution. However, popular index funds like eMAXIS Slim All Country and eMAXIS Slim S&P 500 are available at most major iDeCo providers.
"What about US citizens? Does PFIC apply to iDeCo too?"
Yes. iDeCo investment trusts are Japan-domiciled funds and classified as PFICs under US tax law. US citizens face the same punitive taxation issues with iDeCo funds as with NISA investment trusts. Given that iDeCo doesn't allow US-domiciled ETFs, there's essentially no way for US citizens to use iDeCo without triggering PFIC problems. For American residents in Japan, NISA via IBSJ with US ETFs is the only clean tax-advantaged path.
The Bottom Line
For foreign residents in Japan, the priority order is clear:
First: NISA. Flexible withdrawals, tax-free gains, clean exit when you leave, large annual quota, no lock-up. This is the foundation of your Japan investing strategy.
Second: iDeCo — but only if the conditions are right. The conditions being: you're staying permanently, OR you're confident you'll qualify for the lump-sum withdrawal (5 years or less of contributions), OR you're a high earner who values the annual tax deduction enough to accept the lock-up risk.
Never: iDeCo without NISA. There is no scenario where a foreign resident should prioritize iDeCo over NISA. The liquidity difference alone settles the question.
The worst outcome is contributing to iDeCo for 6+ years, leaving Japan, failing to qualify for the lump-sum withdrawal, and watching your money sit in a Japanese account for decades — shrinking slowly from management fees — until you turn 60. A little planning prevents this entirely.
→ Related: Tsumitate vs Growth Investment: Which NISA Type Should You Choose? | Best Investment Funds for NISA: A Foreigner's Guide | Leaving Japan? What Happens to Your NISA Account
This article is for general informational purposes only and does not constitute investment, tax, or legal advice. Tax treatment depends on individual circumstances and may change. Consult a qualified tax advisor or financial planner for personalized guidance.