The self-employed retirement toolkit in Japan
Small-business mutual aid, iDeCo, the National Pension Fund, and the extra pension — how the deductible schemes fit together.
Self-employed savers can stack deductible schemes — small-business mutual aid (up to ¥840,000/yr), iDeCo with the National Pension Fund (up to ¥816,000/yr combined), and the low-cost extra pension — to build a retirement while cutting taxable income.
Key points
- Small-business mutual aid: ¥1,000–70,000/month, fully deductible, a self-made severance fund.
- iDeCo for the self-employed: up to ¥68,000/month, combined with the National Pension Fund.
- The extra pension (付加年金) is a cheap way to raise the state pension floor.
- All are income-deductible, so they cut this year’s tax as they build your future.
Three deductible layers
Because the self-employed have a thinner public pension than employees, Japan offers schemes built to close the gap — and each reduces taxable income. Small-business mutual aid (小規模企業共済), run for small proprietors, lets you contribute ¥1,000–70,000 a month (up to ¥840,000 a year), fully deductible, and pays out as a lump sum or pension when you close or retire the business — effectively your own severance fund. iDeCo, the individual defined-contribution pension, lets the self-employed contribute up to ¥68,000 a month, and that ceiling is shared with the National Pension Fund (国民年金基金), so you split one budget between them. The extra pension (付加年金) adds a small fixed amount to your monthly National Pension premium to raise your lifelong state pension cheaply.
Contributions to all of these are deducted from income (as small-business mutual aid premiums, iDeCo/pension-fund premiums, or social-insurance premiums), so a yen saved for later is also a yen off this year’s taxable base — a rare double benefit.
A sensible order — and one caution
A common sequence is: first make sure the mandatory National Pension is paid (add the cheap extra pension), then use small-business mutual aid for flexible, deductible saving you can borrow against and unwind if the business closes, then iDeCo for long-horizon retirement money you accept is locked until age 60. Fit the amounts to cash flow — these are commitments, and small-business mutual aid can penalize very early voluntary exits, while iDeCo is locked by design.
One caution worth flagging: the tax treatment of lump-sum payouts depends on timing rules that interact across iDeCo, mutual aid, and any severance, and those rules have been tightened. If you expect large lump sums, plan the order and years of withdrawal with a professional so the retirement-income deduction is not reduced by overlap.
Who this is for
- Profitable freelancers wanting deductible retirement saving
- Anyone comparing mutual aid vs iDeCo
What this is not
- Personalized withdrawal-timing tax planning
- Employees with a company pension
- Contribution ceilings and lump-sum taxation rules change and interact — confirm current limits and, for large payouts, consult a 税理士.
Frequently asked questions
How can a self-employed person save for retirement in Japan tax-efficiently?
Self-employed savers can stack deductible schemes. Small-business mutual aid (小規模企業共済) allows ¥1,000–70,000/month (up to ¥840,000/year), fully deductible, paid out when you close or retire the business. iDeCo lets the self-employed contribute up to ¥68,000/month, a ceiling shared with the National Pension Fund. The extra pension (付加年金) cheaply raises the state pension. All reduce this year’s taxable income while building your own safety net; lump-sum payout timing rules interact, so plan large withdrawals with a professional.
What about pension and health insurance when self-employed in Japan?
As a sole proprietor you generally enroll in National Health Insurance (国民健康保険) and the National Pension (国民年金), and you pay both yourself — there is no employer split. National Pension is a flat monthly amount; National Health Insurance premiums are income-based and billed by your municipality. You can add optional coverage (e.g. the national pension fund, iDeCo, or income-protection insurance) to close gaps. Budget these into your tax reserve.