Kokumin Nenkin: Japan National Pension
Kokumin nenkin is the flat-rate pension every non-salaried resident pays: one fixed monthly amount, no income link, no employer to hide behind.1 For freelancers, students, and the between-jobs, it is also the pension most likely to generate arrears that later surface in immigration screening.
Procedures, fees, and requirements can change. Confirm current details at the Japan Pension Service site. This article is general information, not tax, legal, or immigration advice; for your specific case, consult a licensed sharoshi for coverage and exemption questions or a zeirishi for deduction questions.
Overview
The 国民年金 (kokumin nenkin, "National Pension") is Japan's universal first pillar within the social insurance system. Category 1 members, the self-employed, students, and the unemployed, pay a fixed monthly contribution regardless of income.1 Coverage is mandatory for all registered residents aged 20 to 59, irrespective of nationality.12
The design trades precision for universality. Everyone pays the same, everyone earns the same Basic Pension floor, and low-income residents apply for exemption rather than silently defaulting.3 That last distinction carries real weight at immigration review, as the compliance entry explains.
Who enrolls, and where
Three insured categories route every resident exactly one way. 第1号被保険者 (dai-ichigo hihokensha, "Category 1 insured person") covers registered residents 20 to 59 who are neither salaried nor dependent spouses: the self-employed, students, farmers, and the unemployed.1 Category 2 covers persons enrolled through Employees' Pension Insurance or mutual aid associations.1 Category 3 covers the dependent spouse of a Category 2 worker, with no direct contribution.1
| Category | Who | How to enroll |
|---|---|---|
| Category 1 | Self-employed, students, unemployed | File at the municipal office within 14 days |
| Category 2 | Salaried in covered workplaces | Employer enrolls automatically |
| Category 3 | Dependent spouse of Category 2 | Filed through the spouse's employer |
The routing as a whole follows the JPS category rules (as of 2026).1 New Category 1 members file the enrollment application at the municipal office of residence within 14 days of becoming subject, and Category 3 filings go through the spouse's employer to the covering JPS branch within the same window.1 Part-time students working short hours normally stay in the National Pension lane and file at the municipal office.4
The diagram shows the routing decision (as of 2026).1 One filing, one category, no overlaps: the system never recognizes two statuses at once.
Contributions
The flat contribution is 17,510 yen per month for fiscal 2025, and 17,920 yen per month from April 2026 to March 2027 (as of 2026-04-01; confirm current figures with the Japan Pension Service).152 Each month's amount falls due by the end of the following month, so April is payable through May 31.5
Payment channels suit self-payers. Cash works at banks, post offices, and convenience stores, alongside bank transfer, internet payment, and credit card.2 Contributions are deductible as social insurance contributions, which softens the bill at filing time.2
Exemptions, postponement, and the student system
Low income unlocks 免除 (menjo, "contribution exemption") on application, not by default. Full, three-quarter, half, and one-quarter exemptions turn on the prior-year income of the applicant, spouse, or household head; for fiscal 2026 the residual payments are 0, 4,480, 8,960, and 13,440 yen respectively (as of 2026; confirm current figures with the Japan Pension Service).3
Students use the 学生納付特例制度 (gakusei nofu tokurei seido, "Special Payment System for Students"), a postponement rather than an exemption.3 Exempted and postponed months count toward the 10-year qualification for old-age benefits, but they shrink the eventual amount unless retroactively paid.3 Recovery payments reach back up to 10 years (with indexation from the third year), and exemption applications themselves can reach back up to 25 months.36 Each application covers up to one year at the municipal office and must be renewed yearly.3
What contributions buy
Forty years of paid contributions earn the full Old-age Basic Pension: 847,300 yen per year in fiscal 2026, about 70,608 yen per month (as of 2026-04-01; confirm current figures with the Japan Pension Service).7 Ten or more years of combined coverage (paid plus exempted) qualifies for a proportional benefit from age 65.7
Exemption history follows a fixed discount table. Post-April-2009 full-exemption months count at half value toward the benefit, with the partial bands at five-eighths, six-eighths, and seven-eighths.3 Category 1 members can also add the voluntary 付加年金 (fuka nenkin, "additional pension"): 400 yen per month extra buys 200 yen times paid months per year of added benefit (as of 2026; confirm current figures with the Japan Pension Service).1
Pension gaps and residence procedures
Permanent residency screening reviews roughly the past two years of pension participation, and self-paid National Pension months draw the closest scrutiny.8 The standard evidence set is the Nenkin Net monthly payment status plus premium receipts for any National Pension months in the window.9 Readers preparing that evidence should also review the financial and tax criteria reviewers apply.
Arrears in the review window weigh heavily against PR applicants, and late payment does not fully erase the mark under the tightened guideline. Catch up early, keep every receipt, and read the compliance entry before filing anything with immigration.
Good to know
Partial exemption fails if you skip the reduced amount
The residual is not optional decoration on a granted exemption. Miss it and the months flip to non-payment status, which neither builds benefit value nor impresses a reviewer.3
Exempted months count toward vesting but shrink the benefit
Qualification and amount are separate ledgers. Exempted months keep the 10-year clock running while contributing only a fraction to the payout, so buy back high-value years when cash flow allows.37
Job changes create the classic coverage gap
Leaving a salaried post ends Category 2 immediately, but Category 1 starts only when the municipal filing is made.1 The unfiled weeks between jobs are the most common source of accidental arrears, and they surface years later in PR paperwork.8 The same transition affects health coverage, so coordinate the job-change insurance steps in the same week.
See also
- Health Insurance and Pension for Freelancers
- Shakai Hoken Overview
- Blue-Form vs. White-Form Tax Returns
- The Financial and Tax Criteria for Permanent Residency
- Preparing the Permanent Residency Application
- Nenkin Teikibin and Nenkin Net Statements