Your comparison

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Eligible contribution months

Use eligible enrolled months. You cannot buy months before your application. The 480-month input limit does not establish eligibility.

National Pension membership

Member of the National Pension Fund?

Exemption during these months

iDeCo contribution limit

When will the pension start?

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Method and worked example

Total standard premiums = ¥400 × paid months. Annual extra pension = ¥200 × paid months. This compares standard premiums with gross additional pension under a normal age-65 claim. 日本年金機構 · 付加保険料の納付.

Worked example: twelve eligible months

¥400 × 12 = ¥4,800 paid. Annual extra pension is ¥200 × 12 = ¥2,400. Two years of that extra pension total ¥4,800; ten years total ¥24,000. The month count is invented and does not establish eligibility.

The two-year comparison starts when the pension increase starts. Tax, advance-payment discounts, waiting-time costs, early/deferred claims and future law changes are excluded. Fuka is not price-indexed. Annual amounts are not a promise of monthly instalments. 日本年金機構 · 付加年金の計算と物価.

Check before using the figures

Income exemptions, payment deferral and student special payment exclude Fuka. Approved maternity and the October 2026 childcare exemption have specific allowances. You cannot combine Fuka with the National Pension Fund; check any iDeCo combined limit. 日本年金機構 · 2026年10月からの育児免除.

Japan pension contribution guide · Compare an official back-payment quote.

Japan Fuka Nenkin Calculator: ¥400 Additional Pension

Your comparison

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Method and worked example

Worked example: twelve eligible months

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