Japan Pension Guide 2026 — 国民年金・厚生年金・iDeCo・NISA

Overview — The Three Pillars of Japan's Pension System

Japan's retirement income system is structured in multiple tiers:

👉 1st Tier — National Pension (国民年金, Kokumin Nenkin): A flat-rate, mandatory pension for all residents aged 20–60. Provides a basic pension (老齢基礎年金) from age 65. Monthly premium: JPY 16,590 (2026). The full benefit after 480 months (40 years) of contributions is approximately JPY 780,000/year.

👉 2nd Tier — Employees' Pension (厚生年金, Kosei Nenkin): An income-proportional pension for employees covered through their employer. Contribution rate: 18.3% of standard monthly income (50/50 employer/employee split). Benefits are calculated based on average career earnings and years of coverage.

👉 3rd Tier — Voluntary Private Plans: Includes iDeCo (個人型確定拠出年金 — individual-type defined contribution pension), corporate DC/DB plans (企業型確定拠出年金/確定給付年金), and NISA (少額投資非課税制度 — tax-free investing). These are voluntary but offer significant tax advantages.

National Pension — 国民年金 (Flat JPY 16,590/mo)

The National Pension is the foundation of Japan's retirement system, covering all residents:

👉 Coverage: Mandatory for all residents aged 20–60, including self-employed, students, unemployed, and non-working spouses (Category 1 insured). Employees are covered through Kosei Nenkin (Category 2) and their dependent spouses are covered (Category 3).

👉 Monthly Premium (2026): JPY 16,590 for Category 1 insured persons (self-employed, students, etc.). The premium is adjusted annually. Payment can be made monthly, quarterly, or via bank transfer. Prepayment discounts are available (6 months/1 year advance payment reduces the total).

👉 Full Pension: 40 years (480 months) of contributions = full basic pension of approximately JPY 780,000/year (2026). Each month of contribution adds 1/480 of the full amount. Less than 10 years (120 months) of contributions = no pension eligibility (except for those with at least 10 years under the pre-2017 rules).

👉 Exemption System (免除制度): If your income is low, you can apply for full or partial exemption from National Pension premiums. Exempt periods still count toward the 10-year minimum but at reduced benefit levels (1/2, 3/4, or full depending on exemption type). Students can apply for the student exemption (学生納付特例制度).

👉 Voluntary Contribution for those 60–65: Those aged 60–65 can voluntarily continue contributing to increase their basic pension amount. This is useful for those with gaps in their contribution history.

Employees' Pension — 厚生年金 (Income-Proportional)

The Employees' Pension is the main pension for salaried workers, providing income-proportional benefits on top of the basic National Pension:

👉 Coverage: Employees of companies with 5+ regular employees (or 1+ in certain industries). Since 2022, part-time workers working 20+ hours/week with monthly income of JPY 88,000+ are also covered. The contribution is mandatory and automatic through payroll.

👉 Contribution Rate: 18.3% of standard monthly income (標準報酬月額), split 50/50 between employer and employee. The standard monthly income is determined from actual salary using a grade table ranging from JPY 88,000 to JPY 650,000 (cap). Bonuses are also subject to contributions (at the same 18.3% rate, capped at JPY 1.5 million per bonus).

👉 Benefit Calculation: The annual pension benefit is calculated as: Average career standard remuneration × 5.481/1000 × number of months of coverage (post-2003 formula; pre-2003 uses a different rate). The average is based on your entire career, revalued according to wage/salary growth.

👉 Example: An employee with average standard monthly income of JPY 400,000 over 40 years (480 months) would receive approximately: JPY 400,000 × 5.481/1000 × 480 = JPY 1,052,352/year in Employees' Pension, plus ~JPY 780,000/year National Pension = total approximately JPY 1,832,352/year (~JPY 153,000/month).

👉 Spousal Dependent Coverage: A spouse who earns less than JPY 1.3 million/year (Category 3 insured) is covered by the employees' pension without paying separate premiums. They receive the basic National Pension based on the employee's coverage period.

iDeCo — 個人型確定拠出年金 (Individual DC)

iDeCo is a voluntary, tax-advantaged defined contribution pension plan for individuals:

👉 Eligibility: Available to all residents aged 20–65 (up to 60 for new enrollment) who have some form of pension coverage. Self-employed, employees without corporate DC plans, and public servants can join. Employees with corporate DC plans may also be eligible with restrictions.

👉 Monthly Contribution Limits (2026):

• Self-employed (Category 1): Up to JPY 68,000/month
• Employees with corporate DB only: Up to JPY 23,000/month (if no corporate DC) or JPY 20,000/month (if corporate DC exists)
• Employees with no corporate DB or DC: Up to JPY 12,000/month (for those with corporate DC only, up to JPY 20,000/month combined)
• Public servants: Up to JPY 12,000/month (plus mutual aid)

👉 Tax Benefits:

• Contributions are fully deductible from taxable income (所得税 and 住民税 deduction)
• Investment gains within iDeCo are tax-free (no capital gains or dividend tax)
• Withdrawals at age 60+ are taxed as miscellaneous income (公的年金等控除 applied)
• Lump-sum withdrawal qualifies for retirement income tax (退職所得控除) which is highly favorable

👉 Investment Options: iDeCo accounts offer a selection of investment products: mutual funds (investing in domestic/foreign equities, bonds, REITs), bank deposits (定期預金), and insurance products. Most providers offer 10–30+ fund choices. You can change your asset allocation within the account.

👉 Withdrawal: Funds can be withdrawn from age 60 (with at least 10 years in the plan). The withdrawal can be taken as a lump-sum (一時金) or as an annuity (年金). Lump-sum withdrawals benefit from the retirement income deduction (退職所得控除): JPY 800,000 × years of service, then 1/2 of the excess is taxed.

NISA — 少額投資非課税制度 (Tax-Free Investing)

NISA is Japan's tax-free investment account for individuals, significantly expanded in 2024:

👉 Two Tiers (2026 Rules):

• Tsumitate NISA (積立NISA): For long-term, regular investing. Annual limit: JPY 1.2 million. Tax-free period: unlimited (permanent). Eligible investments: approved mutual funds (investment trusts) that meet diversification and low-cost criteria.
• Growth NISA (成長投資枠): For individual stocks and broader investments. Annual limit: JPY 2.4 million (combined with Tsumitate, total annual limit JPY 3.6 million). Tax-free period: unlimited (permanent). Total lifetime contribution limit: JPY 18 million.

👉 Key Features: No tax on capital gains or dividends within the NISA account. No upper age limit (available to anyone 18+). Unused annual allowance does not carry forward to future years. You can open a NISA account with any eligible financial institution (securities company, bank).

👉 Comparison with iDeCo: NISA contributions are not tax-deductible (unlike iDeCo), but withdrawals are completely tax-free at any time (no age restriction, no tax on withdrawal). iDeCo gives upfront tax deductions but taxes withdrawals (albeit favorably). NISA is more flexible; iDeCo is better for tax efficiency if you are in a high tax bracket.

👉 Strategy: Many Japanese investors use a combination: maximize iDeCo for the upfront tax deduction (especially high earners), then use NISA for additional tax-free investing. Contribution order: NISA should generally be prioritized over taxable accounts due to permanent tax-free treatment.

Corporate Pensions — 企業年金

Many large companies offer additional corporate pension plans on top of the mandatory public system:

👉 Defined Benefit (確定給付企業年金, DB): Company promises a specific benefit at retirement, usually based on salary and years of service. The company bears the investment risk. Premiums are set actuarially. Common in large Japanese companies.

👉 Corporate DC (企業型確定拠出年金): Company contributes a defined amount to individual employee accounts. The employee chooses how to invest. The company bears no investment risk after contribution. Contribution limits: up to JPY 55,000/month (if no DB plan exists) or JPY 27,500/month (if DB plan also exists).

👉 Interaction with iDeCo: Employees with a corporate DC plan can also contribute to iDeCo, subject to combined contribution limits. The total (corporate DC + iDeCo) cannot exceed the individual limit (JPY 55,000/month or JPY 27,500/month).

👉 Tax Treatment: Corporate pension contributions are tax-deductible for the company. Employee contributions (if any) are also tax-deductible. Investment growth is tax-deferred. Withdrawals are taxed as miscellaneous income (annuity) or retirement income (lump-sum).

Pension Payment and Taxation

Japanese public pensions are paid from age 65 and are subject to specific tax treatment:

👉 Start Age: Standard start age is 65. You can choose to start earlier (age 60–64) with a reduced monthly amount (0.5% reduction per month of early start, 6% per year) or later (age 66–75) with an increased amount (0.7% increase per month of delay, 8.4% per year).

👉 Taxation: Public pension income is treated as miscellaneous income (雑所得). The taxable amount is calculated as: Gross pension - Public Pension Deduction (公的年金等控除). For those under 65, the deduction is JPY 600,000 minimum. For those 65+, the deduction is JPY 1,100,000 minimum. Above these thresholds, a portion becomes taxable.

👉 Withholding: Public pension payments have withholding tax (源泉徴収) at source. The rate depends on the pension amount and other income. Annual tax return (確定申告) may be needed if you have other income or deductions.

👉 Social Insurance Premiums: Pensioners must pay health insurance and long-term care insurance premiums on their pension income. These are typically deducted from the pension payment before disbursement.

FAQ

What is the monthly National Pension premium for 2026?

JPY 16,590 per month for Category 1 insured persons (self-employed, students, unemployed). Prepayment for 6 or 12 months offers a discount. Employees pay through their Kosei Nenkin contribution.

How is the Employees' Pension (Kosei Nenkin) calculated?

Annual benefit = average career standard monthly income × 5.481/1000 × months of coverage (post-2003 formula). Combined with the basic National Pension (~JPY 780,000/year for 40 years of contributions).

What is iDeCo and who can join?

iDeCo is a voluntary defined contribution pension plan with tax-deductible contributions. Available to residents aged 20–65. Contribution limits range from JPY 12,000 to JPY 68,000/month depending on employment type and existing pension coverage.

What is the difference between iDeCo and NISA?

iDeCo contributions are tax-deductible (reduces taxable income now), but withdrawals are taxed at retirement. NISA contributions are not deductible, but all investment gains and withdrawals are permanently tax-free. iDeCo has age/withdrawal restrictions; NISA offers full flexibility.

What are the 2026 NISA contribution limits?

Tsumitate NISA: JPY 1.2 million/year. Growth NISA: JPY 2.4 million/year. Combined annual limit: JPY 3.6 million. Total lifetime contribution limit: JPY 18 million. Tax-free period is permanent (unlimited).

Can I receive a Japanese pension if I leave Japan?

Yes, if you have contributed for at least 10 years (120 months) combined in the National Pension and/or Employees' Pension, you are eligible for a Japanese pension from age 65, even if you live abroad. If less than 10 years, you can claim a lump-sum withdrawal (脱退一時金).

How is pension income taxed?

Public pension income is taxed as miscellaneous income (雑所得) with a special deduction (公的年金等控除): JPY 600,000 (under 65) or JPY 1,100,000 (65+). Withholding tax is applied at source. Additional tax is due if total income exceeds withholding amounts.

Can I work and receive a pension at the same time?

Yes. If you continue working while receiving a pension, the Employees' Pension may be partially suspended if your total income (salary + pension) exceeds certain thresholds (在職老齢年金制度). The National Pension (basic pension) is not affected by employment income.