Worked in Japan and Ireland? Your Pension Rights Explained

Ireland and Japan have a bilateral Social Security Agreement in force since 1 December 2010. If you worked in Japan — whether as an English teacher, a tech worker, a researcher, or in any other capacity — this agreement may significantly affect your pension entitlements in both countries. But it also creates one of the most consequential pension decisions you will ever face: the lump-sum withdrawal trap.

This guide explains the Japanese pension system, how totalisation with your Irish PRSI record works, and the single decision that could either preserve a lifetime income from Japan or wipe it out entirely.

The Ireland–Japan Social Security Agreement

The agreement between Ireland and Japan came into force on 1 December 2010. Unlike the EU pension coordination rules that apply when Irish people work within the European Union, this is a direct bilateral treaty negotiated between the two governments. It operates on two main principles:

• Elimination of double coverage: Workers are covered by one country’s social security system only, never both simultaneously. If you are sent from Ireland to Japan temporarily by an Irish employer, you continue paying Irish PRSI and do not pay Japanese pension contributions — and vice versa for Japanese workers sent to Ireland.
• Totalisation: Contribution periods in each country can be combined to help you meet qualifying thresholds for pension payments in either system.

This agreement is why, unlike working in a country with no agreement (such as South Africa), your Japanese working years are not simply lost from an Irish pension perspective — they can be used to reach qualifying thresholds.

The Japanese Pension System: Two Tiers

Japan has a two-tier public pension system. Understanding the distinction matters because the bilateral agreement interacts with these tiers differently.

Tier 1: Kokumin Nenkin (国民年金 — National Pension)

Kokumin Nenkin is the basic flat-rate pension that covers all residents of Japan aged 20 to 59, regardless of employment status. Whether you were an employee, self-employed, or a student, you were required to enrol and pay contributions during your time in Japan.

The key totalisation rule is this: if your Japanese contribution period alone falls below 10 years but your combined Irish PRSI and Japanese periods reach 10 years, you can qualify for a Japanese Kokumin Nenkin pension. The pension paid will be based only on your actual Japanese contribution months — Irish periods get you over the threshold, but do not inflate the payment.

Tier 2: Kosei Nenkin (厚生年金保険 — Employees’ Pension Insurance)

If you were an employee in Japan — working for a Japanese company, an international firm with a Japanese entity, or certain other employers — you were almost certainly also enrolled in Kosei Nenkin, the earnings-related second tier. Contributions are split equally between employer and employee (approximately 18.3% of standard monthly income, each party paying half). Kosei Nenkin provides an additional pension on top of Kokumin Nenkin at age 65, based on your average earnings and contribution period.

Because Kosei Nenkin enrolment automatically includes Kokumin Nenkin coverage, employees contribute to both tiers simultaneously — employers handle this through payroll. Your Basic Pension Number (基礎年金番号) ties both records together.

Corporate and Individual DC Pensions

Many larger Japanese employers operate occupational defined contribution (DC) plans (企業型DC, kigyo-gata DC), and individuals can also contribute to iDeCo (個人型確定拠出年金), Japan’s individual DC scheme. These sit entirely outside the bilateral agreement — they are private pension arrangements with their own rules on portability and access. If you participated in an employer DC plan, contact the plan administrator or your former employer’s HR department. DC balances can sometimes be transferred to an iDeCo account upon leaving an employer, preserving them until retirement age.

The Lump-Sum Withdrawal Payment (脱退一時金 — Dattai Ichiji-kin)

Japan allows foreign nationals who have left the country to apply for a lump-sum refund of their pension contributions. This is called dattai ichiji-kin (脱退一時金). The amount depends on your contribution period:

Lump-sum application rules

• You must file within 2 years of leaving Japan and losing your Japanese address registration
• You must have at least 6 months of contributions
• You must not be a Japanese national
• You must not be living in Japan
• Applications are made by post to the Japan Pension Service using Form “Lump-sum Withdrawal Payments” — available at nenkin.go.jp
• You will need your Basic Pension Number (基礎年金番号) — printed on your Nenkin Techo (pension booklet) or on contribution notices from your employer

How Totalisation Works in Practice

The Ireland–Japan agreement allows Japanese contribution periods to be counted alongside Irish PRSI contributions to reach qualifying thresholds — and vice versa. To use totalisation for the Japanese pension, you need:

1. At least 1 month of Japanese pension contributions
2. A combined total of at least 10 years (120 months) of Japanese + Irish contributions
3. To have not claimed the lump-sum withdrawal payment

If these conditions are met, you qualify for a Japanese Kokumin Nenkin pension at age 65. The pension is paid pro-rata based on your actual Japanese contribution months only — it is not a full Japanese pension, but it is a genuine, lifetime, indexed pension income paid in yen (convertible to euro at whatever rate applies). Japan Pension Service can pay directly to an overseas bank account.

Similarly, Japanese contribution periods can help you meet the minimum Irish PRSI threshold for the Irish State Pension (Contributory) if your Irish record alone falls short. You still need some Irish PRSI contributions to trigger this — a purely Japanese record with zero Irish PRSI will not qualify you for an Irish pension.

Worked Example

Take someone who spent 5 years working in Tokyo (60 months of combined Kokumin and Kosei Nenkin contributions) before returning to Ireland, where they have worked for 33 years accumulating 33 years of PRSI.

• Japanese pension: 60 Japanese months + 396 Irish months = 456 months combined — well over the 120-month minimum. They qualify for a Japanese pension at 65. Payment is proportional to 60 Japanese contribution months, not the full 456 months. They should not claim the lump sum.
• Irish State Pension: 33 years of PRSI (approximately 1,716 contributions) — qualifies for a full Irish State Pension (Contributory) at 66 under current rules. Irish PRSI totalisation with Japan is not needed here as their record is already well above the minimum.
• Result: Two separate pension incomes — one from Japan, one from Ireland — both paid from age 65/66 respectively.

How to Claim Your Japanese Pension from Ireland

Applications for Japanese pension payments from abroad are submitted by post to the Japan Pension Service (日本年金機構, Nippon Nenkin Kiko). Key practical points:

• Download claim forms from nenkin.go.jp
• You will need your Basic Pension Number (基礎年金番号) — if you cannot locate it, the Japan Pension Service can help trace it via passport details and dates of residence
• Claims can be submitted from age 65; you can also request a projection statement (ねんきん定期便 equivalent for overseas residents) in advance
• Payment is made in yen; nominate a bank account that can receive international wire transfers
• The Irish Revenue Commissioners will treat Japanese pension income as foreign pension income assessable to Irish income tax; the Ireland–Japan Double Taxation Agreement determines taxing rights

Irish PRSI Voluntary Contributions

If you spent time in Japan and have gaps in your Irish PRSI record, you may be able to fill those gaps with Voluntary PRSI Contributions (Class S or Class V) to protect your Irish State Pension entitlement. The cost is approximately €500 per year and application is made to the Department of Social Protection. This is particularly worth considering if your Irish record is close to but not yet at a key threshold. See our State Pension page for full details on contribution thresholds.

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