📋 Japan National Pension Premium Calculator
Calculate your Japan National Pension (国民年金) premiums from the flat monthly rate and your contribution months, including student exemption and catch-up (追納) options.
What is this tool?
The National Pension (国民年金, Kokumin Nenkin) is Japan's first-tier, flat-rate pension that every resident aged 20–59 must join — including the self-employed, students, and anyone not in the Employees' Pension. Rather than being income-based, it charges a single fixed monthly premium set each fiscal year. For FY2026 the premium is ¥17,920 per month (¥215,040 per year), a figure revised annually by law. Contribution is normally expected for 40 years (480 months) between ages 20 and 60 to receive the full base benefit. People who cannot pay have relief options: a 学生納付特例 (student exemption, pay later via 追納), and 免除・納付猶予 (full or partial exemption) for low income that cuts the premium to 1/4, 1/2, or 3/4 of the standard amount. Critically, exemptions only waive the premium — they still count as contribution months for the base benefit, but the waiver years are not "paid" and reduce the eventual payout unless you later 追納 (catch up) the missed premiums within two years. This calculator totals what you would pay under different scenarios. See the public pension estimator for the benefit side and the employees' pension tool if you were also in company insurance.
How it works
The premium equals the flat monthly rate (¥17,920 for FY2026) multiplied by the number of contribution months, adjusted for any exemption tier. A 1/2 exemption halves the effective rate for those months; 学生納付特例 defers payment (¥0 now) but lets you 追納 later at the original rate. The calculator sums the months you select and applies the tier fraction.
| Scenario | Effective monthly rate |
|---|
National Pension premium exemption & deferral tiers (FY2026 standard premium is ¥17,920/month) Exemption must be applied for each year. Approved applicants pay only the reduced amount, and the waived portion is treated as paid contributions toward the future pension.
| Exemption category | Monthly premium you pay | Government covers |
|---|---|---|
| Full exemption | ¥0 | 100% |
| 3/4 exemption | ¥4,480 | 75% |
| 1/2 exemption | ¥8,960 | 50% |
| 1/4 exemption | ¥13,440 | 25% |
| Standard (no exemption) | ¥17,920 | 0% |
| --- | --- |
|---|
| Full payment | ¥17,920 |
|---|
| 1/2 exemption | ¥8,960 |
|---|
| 1/4 exemption | ¥13,440 |
|---|
| Student defer (追納 later) | ¥0 now |
|---|
How to use
- Enter the number of full-payment months (default 480 for a complete 40-year record).
- Choose any exemption tier that applied for part of your history.
- Enter the months covered by that exemption (optional).
- Click Calculate to see total premiums under the scenario.
Frequently Asked Questions
What is the National Pension monthly premium for 2026?
The FY2026 (令和8年度) flat premium is ¥17,920 per month, or ¥215,040 per year. The rate is revised by law each fiscal year, so confirm the current year's figure with the Japan Pension Service.
Do exemption months still count toward my pension?
Yes. Months under 免除 (exemption) or 学生納付特例 still count as contribution months for the 40-year record, but the waived premiums were not "paid" — so the eventual base benefit is reduced unless you later 追納 (catch up) the missed amounts.
What is 追納 (catch-up)?
追納 lets you pay missed or exempted premiums later, within two years for most cases (up to ten years under special rules), at the rate that applied when they were due. It restores those months to "paid" status and improves your future benefit.
Who must join the National Pension?
All residents aged 20–59 who are not already in the Employees' Pension (company insurance) — chiefly the self-employed, freelancers, students, and dependents' spouses without their own employment coverage.
Is the premium tax-deductible?
No. National Pension premiums are not an income-tax deduction, unlike some private pension contributions. They are a statutory social-insurance cost.
This tool is for informational purposes only and does not constitute financial advice. Consult a qualified financial professional for advice specific to your situation.
Tips & Advice
If you are a student, always file the 学生納付特例 — paying ¥0 now preserves your contribution months and you can 追納 (catch up) within two years at the rate that applied then, which is almost always cheaper than leaving gaps. Gaps (未納) are the real enemy: each missing month permanently shrinks your future base pension with no way to recover it later. Low-income earners should apply for 免除 (exemption) rather than skip payments, because exempt months still count toward the 40-year record. Remember the premium is deducted from your bank account around the 29th of each month in most municipalities. Pair this with the public pension estimator to see how contribution months translate into monthly benefit.
Related Tools
Japan Employees' Pension Premium Calculator
Calculate Japan Employees' Pension (厚生年金) insurance premiums from your standard
Japan Public Pension Estimator
Estimate your Japan public pension (公的年金): flat National Pension base plus earni
Japan NHI Premium Calculator
Estimate your Japan National Health Insurance (NHI / 国民健康保険) annual premium from
Social Security Calculator
Social Security calculator: estimate your retirement benefit at any age from 62
Income Tax Calculator
Calculate your income tax with progressive brackets. Supports US, UK, Australia
Sources & References
Last reviewed August 2026.
- Japan Pension Service — National Pension (Kokumin Nenkin).
- Ministry of Health, Labour and Welfare — National Pension system.
Limitations
Disclaimer: This tool uses the FY2026 flat rate of ¥17,920/month and simplified exemption tiers. Actual premiums, exemption approvals, and 追納 windows depend on your municipality and the Japan Pension Service's rules, which change by fiscal year. It is not official advice — verify on your statement or via ねんきんネット.