Leaving Japan?
Most foreigners leave the 20.42% pension tax on the table.

What the "lump-sum withdrawal payment" actually is

If you leave Japan before you qualify for a Japanese pension, you'd normally lose everything you paid in. The lump-sum withdrawal payment (dattai ichijikin, 脱退一時金) gives part of it back as a one-time payment.

Who can claim it

Per the Japan Pension Service, you generally qualify if all of these are true (confirm your own case with JPS):

• You are not a Japanese national.
• You have 6 or more months of coverage (National Pension paid months, or Employees' Pension insured months).
• You do not have an address in Japan anymore.
• You have never qualified for a Japanese old-age pension (i.e. under the 10-year requirement) and have no disability/other pension entitlement.
• You apply within 2 years of the date you lost your insured status (this deadline is strict — miss it and the right expires).

National Pension vs Employees' Pension — the tax is different

This is the part people get wrong. There are two pots, and they are taxed differently.

So if you were a company employee, your lump-sum arrives already reduced by 20.42%. That 20.42% (which includes the special reconstruction income tax) is the part most people never reclaim.

The month cap on how much you get back

The lump-sum only counts up to a maximum number of contribution months. The current JPS table caps this at 60 months (5 years), raised from 36 months in April 2021. The coefficient tops out at 5.5 at 60 months, so paying beyond 5 years does not increase the Employees' Pension lump-sum.

Worked example (illustrative — verify your own figures)

Let's make it concrete. This is a model calculation to show the mechanics, not a promise of your amount. The exact lump-sum formula, coefficients and rates must be confirmed with JPS/NTA for your own case.

Step 1 — Estimate the gross lump-sum

The Employees' Pension lump-sum is roughly average standard remuneration × a coefficient tied to your months. For a 36-month case (the 36–41 month band), the current JPS table uses a coefficient of 3.3 (confirm the band that applies to you with JPS — it steps up every 6 months).

Step 2 — The 20.42% is withheld up front

Step 3 — Reclaim it with a tax representative

Here's the lever. The lump-sum is treated as retirement income (taishoku shotoku) for tax. Retirement income gets a big deduction: ¥400,000 per year of service (minimum ¥800,000), and only half of anything above the deduction is taxable.

In this model, by filing the refund return under the "elective taxation of retirement income" (taishoku shotoku no sentaku kazei), the departing resident reclaims the whole ¥202,158. This example works out to a full refund only because the deduction wipes out the taxable base. For larger lump-sums (or fewer years of service), some tax may actually be due — half of the amount above the deduction is taxed at the normal income-tax brackets plus the 2.1% reconstruction surtax — so the refund is most, not necessarily all, of the withheld amount. Your own figure depends entirely on your gross lump-sum and years of service.

How the tax refund actually works (the two-form move)

You are a non-resident once you leave, so you can't just walk into a tax office later. You need someone in Japan to file for you.

• Form 1 — Appoint a tax representative (nozei kanrinin, 納税管理人). This is a person or firm in Japan who handles your filing and receives the refund on your behalf. File the "Notification of Tax Agent for Income Tax/Consumption Tax" — ideally before you leave Japan (or by your departure date). Doing it before departure keeps the process clean.
• Form 2 — File the refund return. After you receive the lump-sum (which shows the 20.42% withheld), your tax representative files the refund return using elective taxation of retirement income at your last tax office in Japan. The refund lands in a Japanese yen bank account in Japan, so you generally need a domestic account still open (your representative's arrangement matters here).

Timing reality: the lump-sum itself often takes several months to pay out, and it's paid after you've left — so the tax refund step happens once you're already home. That's exactly why appointing the representative before you go is the smart order of operations.

"Should you even claim it?" — the contrarian caveat

I run the numbers without emotion, so I'll give you the case where the obvious answer is wrong.

Mio's rule: short stay, no agreement country → claim it, and don't forget the tax refund. Longer coverage + an agreement country + a long working life ahead → do the math on totalization first. Once you claim the lump-sum, those periods are gone.

Summary

• Non-Japanese leaving Japan with 6+ months of pension and no pension entitlement can claim the lump-sum withdrawal payment — apply within 2 years of losing insured status.
• The National Pension part is tax-exempt; the Employees' Pension part has 20.42% withheld up front.
• Appoint a tax representative (nozei kanrinin) — ideally before leaving — and file the elective retirement-income refund return to reclaim much or all of that 20.42%.
• Current month cap is 60 months (per the current JPS table); confirm the cap in force on your departure date with JPS.
• If you're from a totalization-agreement country, claiming may forfeit periods you could combine later — not always the best move.