Japan refunds part of your pension contributions when you leave. The Indian tax department wants their share. Here's how it works.

Nenkin is Japan's national pension system. All residents aged 20-60 are required to contribute, including foreign nationals on work visas. The standard contribution under the National Pension (Kokumin Nenkin) system is ¥17,920 per month for FY 2026-27 (up from ¥17,510 in FY 2025-26); for company employees enrolled in the Employees' Pension (Kosei Nenkin), the contribution is 18.3% of standard monthly remuneration, half paid by employer and half by employee.

When you leave Japan permanently, you have a one-shot opportunity to claim back a portion of your contributions as a lump-sum withdrawal (dattai ichijikin). The eligibility conditions: you must not have Japanese nationality, you must have contributed for at least 6 months, you must no longer have a Japanese address, and you must apply within 2 years of leaving Japan.

For an Indian engineer who spent 3-5 years in Japan on a work visa, the lump-sum refund is typically in the range of ¥500,000 to ¥3 million depending on the contribution period and salary. It's a meaningful one-time payout — but the Indian tax treatment determines how much actually reaches your bank account in India.

The lump-sum refund is calculated based on your contribution period and the standard monthly remuneration during those years. The contribution-months cap for refund calculation is currently 60 months (5 years) for both the National Pension and Employees' Pension systems. Japan's pension reform law published in the Official Gazette on 20 June 2025 raised this cap to 96 months (8 years), but implementation is set by cabinet order and is expected around 2029. The 60-month cap remains in force as of June 2026.

An Indian engineer who spent 7 years in Japan and contributed throughout currently gets a refund calculated on 60 months (5 years equivalent), with the remaining 2 years effectively forfeited at lump-sum claim. Once the 96-month cap is operationalised, the same engineer's refund will scale to 7 years. (You can choose to leave the full contribution record in place and claim a Japanese pension at age 65 instead, but for most Indians returning permanently to India, the lump-sum is the practical option.)

The gross refund amount before withholding tax is the figure Japan calculates. Japan then withholds 20.42% at source as income tax (20% national income tax plus a 2.1% reconstruction surtax applied on the income tax — totalling 20.42 percentage points on the gross refund) before remitting the net amount to your designated bank account. The net amount lands in your Indian bank in INR after forex conversion.

The 20.42% withholding is not the final Japanese tax. It's a default withholding that can be partially reclaimed through a refund procedure after the lump-sum is paid.

The mechanism: appoint a Japanese tax representative (nōzei kanrinin) before leaving Japan. This is typically a Japanese tax accountant or a service provider that specialises in expatriate refund claims. After your lump-sum withdrawal is processed and the 20.42% is withheld, your tax representative files a tax return on your behalf claiming the refund. Because lump-sum withdrawals are taxed under specific provisions that calculate the actual liability based on contribution period and amount, the refund recovery is often a significant portion of the withheld amount — typically 70-90% of the 20.42%.

The net effective Japanese tax after the refund is typically 2-6%. The refund processing time is 6-12 months from the date of filing. The tax representative's fee is usually a percentage of the refund (10-15% is standard, capped) or a flat fee.

Doing this without a tax representative is technically possible but logistically very difficult once you've left Japan. The Japanese tax office requires correspondence to a Japanese address and responses in Japanese. Most returning Indian engineers find the tax representative fee well worth paying for what's typically a ¥100,000 to ¥500,000 net refund.

Once you're an Indian tax resident (the FY when your day-count crosses the threshold), Japan-source income becomes taxable in India as part of your worldwide income — subject to any DTAA exemption or credit mechanism.

The nenkin lump-sum withdrawal is technically a one-off refund of contributions rather than a recurring pension payment, which makes its treaty characterisation contested. Article 18 of the India-Japan DTAA covers pensions in respect of past employment and allocates the taxing right to the recipient's state of residence — meaning that under an Article 18 reading, India would tax the lump sum and Japan would have no primary claim. The practical complication: Japan's 20.42% withholding is a domestic Japanese rule applied at source regardless of the treaty position, recoverable separately through the tax representative process described above.

Most Indian CAs handle the lump sum conservatively: include the gross amount in Indian ITR-2 as foreign-source income (typically under 'other income' or salary-related foreign income, depending on the engagement letter with the Japanese employer), claim Form 67 FTC for the post-refund net Japanese tax actually paid, and rely on RNOR (where applicable) for the year-of-receipt shield. Aggressive positions — treating the lump sum as a treaty-exempt pension that Japan alone can tax — are sometimes taken by specialists but require a documented Article 18 analysis and a CA willing to defend it.

The slab-rate Indian tax on a ¥2-3 million net lump sum (₹13-20 lakh at typical INR-JPY rates) can be substantial — 30%+ if you're in the top bracket and have other Indian income. Foreign tax credit for the post-refund Japanese tax (2-6% effective) gives only modest relief. Outside the RNOR window, the Indian tax on a ₹15 lakh net nenkin payout can land in the range of ₹4-6 lakh.

RNOR (Resident but Not Ordinarily Resident) is the transitional Indian residency status that shields foreign-source income for up to 2-3 years after return. If the nenkin lump-sum is received while you're RNOR, foreign-source income (including the Japanese lump sum) is not taxed in India.

This is the lever. Apply for the nenkin lump-sum AFTER you've become Indian-resident-but-RNOR — not before. The timing sequence:

1. Leave Japan permanently.

2. Become Indian tax resident for the FY (typically by the day-count rule).

3. Confirm RNOR status with your CA based on the 9-out-of-10-years or 729-days-in-7-years tests.

4. THEN file the nenkin lump-sum application from India.

5. The lump sum lands while you're RNOR. India doesn't tax it.

6. Japan's 20.42% withholding still applies, but Japanese tax representative recovers most of it as a Japanese refund.

Net effective tax on the nenkin: 2-6% (Japanese post-refund) + 0% (Indian under RNOR) = 2-6% total.

Compare against the un-planned scenario: nenkin claimed while still in Japan or in your first non-RNOR Indian year. Effective tax: 2-6% Japan + 25-35% India = 27-41% total.

The planning value is ₹3-5 lakh on a typical Indian-engineer nenkin payout. The cost is a delayed application and the discipline to wait until you've confirmed RNOR before filing.

Pre-departure (T-90 days): Appoint a Japanese tax representative. Get their contact details, signed engagement, and bank coordinates for the eventual nenkin payout.

Departure day (T0): Update your address with the Japanese ward office. Deregister from any local insurance schemes. Confirm with employer that final salary and any nenkin-related correspondence will route through the tax representative.

First month in India (T+30): Establish your Indian residency status. Confirm with CA whether you're qualifying for RNOR. Open or reactivate your Indian bank account where the nenkin will eventually land.

Months 2-6 in India (T+60 to T+180): Wait. Do not apply for nenkin yet. The income tax filing for your departure Japanese tax year is processed separately; coordinate that with your Japanese tax representative.

Month 7-12 in India (T+210 to T+365): Confirm RNOR status is firmly established for your current Indian FY. File the nenkin lump-sum application through your Japanese tax representative. Receive the gross lump-sum minus 20.42%. The tax representative initiates the Japanese refund process for the withholding.

Month 12-18 (T+365 to T+540): Japanese refund processed; net effective Japan tax settles at 2-6%. File your Indian ITR-2 for the FY of receipt. Report the gross nenkin under foreign income; claim the RNOR exemption (or, if not RNOR, claim Form 67 FTC for Japanese tax). The Indian tax position settles.

This 18-month sequence converts what could be a 27-41% effective tax into a 2-6% effective tax. The cost is patience and one good Japanese tax representative.