Disclaimer: This article is for general education only and is not financial, tax or legal advice. Figures are examples based on public data available in November 2026. See our Disclaimer.
"How much money do I need to retire early?" is the first question almost everyone asks about FIRE. Most answers online are written for the U.S. They use dollars, American health insurance and American taxes.
If you live in Japan, the math is different. You will pay National Pension and National Health Insurance yourself after leaving your company. Resident tax arrives a year late. You may receive a public pension from age 65. All of this changes your FIRE number.
This guide walks you through a simple, four-step way to calculate your FIRE number in Japan, with yen examples you can copy.
Quick answer
Your FIRE number = (yearly living costs + costs you pay after leaving work) ÷ your safe withdrawal rate. With a 4% rate, that is about 25 times your yearly spending. A single person spending ¥200,000 a month in Tokyo might need roughly ¥68–78 million, depending on the withdrawal rate. Your number can be much lower if you keep some side income or plan around your pension.
Step 1: Find Your Real Yearly Spending
Your FIRE number starts with your spending, not the national average. Still, averages are a useful reality check. Here is what Japanese households spent per month in 2025, according to the government's Family Income and Expenditure Survey (家計調査):
| Household type (2025) | Average monthly spending | Per year |
|---|---|---|
| Single worker, age 34 or under | about ¥179,000 | about ¥2.15 million |
| Single worker, age 35–59 | about ¥206,000 | about ¥2.47 million |
| Households of two or more | about ¥314,000 | about ¥3.77 million |
Note that the survey's housing number is low because many households own their homes. If you rent in a big city, your rent alone may be ¥70,000–¥120,000 or more. Track your own spending for at least 3–6 months before you trust any FIRE number. Our guide Assessing Your Financial Situation shows how.
Step 2: Add the Costs That Appear After You Leave Your Company
This is the step most U.S.-based FIRE calculators miss. While you are an employee, your company pays half of your health insurance and pension, and takes your share out of your salary automatically. After you quit, you usually pay these yourself:
| Cost | What to expect |
|---|---|
| National Pension (国民年金) | ¥17,920 per month in fiscal 2026 (about ¥215,000 a year), generally until age 60. The amount is fixed and does not depend on income. |
| National Health Insurance (国民健康保険) | Based on last year's income and your city. With low income, discounts (軽減) can make it quite small. In your first year after quitting, it can be high because it is calculated from your salary. |
| Resident tax (住民税) | Also based on the previous year's income, so you still pay it in the year after you stop working. |
| Things your company used to cover | Commuting pass, health checks, sometimes housing allowance or a phone. |
The "first-year shock": because health insurance and resident tax are based on last year's income, your first year of FIRE is often the most expensive. Keep an extra year of these costs in cash. Also compare National Health Insurance with voluntary continuation (任意継続) of your company plan, which you can usually keep for up to two years after leaving.
Step 3: Choose a Safe Withdrawal Rate
The famous 4% rule comes from U.S. research on 30-year retirements. If you retire at 35 or 40, your money may need to last 50 years or more. Many early retirees use a more careful 3–3.5% instead.
Here is how the withdrawal rate changes your FIRE number:
| Yearly spending | 4% (×25) | 3.5% (×28.6) | 3% (×33.3) |
|---|---|---|---|
| ¥2.4 million (¥200,000/month) | ¥60 million | ¥68.6 million | ¥80 million |
| ¥3.0 million (¥250,000/month) | ¥75 million | ¥85.7 million | ¥100 million |
| ¥3.6 million (¥300,000/month) | ¥90 million | ¥102.9 million | ¥120 million |
A withdrawal rate is a planning tool, not a guarantee. Markets, inflation and the yen exchange rate can all change your results. A flexible plan, such as spending a little less after a bad market year, is often more important than the exact percentage.
Step 4: Plan Around Your Japanese Pension
Unlike the standard FIRE math in many guides, you do not have to fund your whole life from investments. If you have paid into Japan's pension system, you will usually receive a pension from age 65.
- In fiscal 2026, the full Basic Pension (老齢基礎年金) is ¥70,608 per month (about ¥847,000 a year) for people who paid premiums for the full 40 years.
- If you also worked as a company employee, you receive an additional Employees' Pension (厚生年金) based on your salary and years worked.
- Your ねんきん定期便 (pension statement) or the online ねんきんネット service shows your own estimate.
A practical way to use this is the two-bucket plan:
- Bridge bucket: money to cover your full spending from your FIRE date until 65.
- Long-term bucket: a smaller portfolio that only needs to cover the gap between your pension and your spending after 65.
Retiring early also means fewer years of Employees' Pension, so your pension will be smaller than if you worked until 60 or 65. Keep paying National Pension (or consider the optional 付加年金 add-on) to protect the basic part.
Worked Example: A Single Person in Tokyo
Hypothetical example for illustration only. Your numbers will be different.
| Item | Per year |
|---|---|
| Living costs (¥200,000/month, including rent) | ¥2,400,000 |
| National Pension (¥17,920 × 12) | ¥215,040 |
| National Health Insurance (assumed, low income after year 1) | ¥100,000 |
| Total yearly need | about ¥2.72 million |
| FIRE number at 4% | about ¥67.9 million |
| FIRE number at 3.5% | about ¥77.6 million |
Add a separate cash reserve for the first-year shock (higher health insurance and resident tax), plus an emergency fund. The National Health Insurance figure is an assumption: check your city's premium calculator for a real estimate.
Ways to Make Your FIRE Number Smaller
| Strategy | How it works | Effect (at 4%) |
|---|---|---|
| Barista FIRE | Keep a part-time or freelance income that covers part of your costs | ¥100,000/month of income cuts the target by about ¥30 million |
| Lower housing costs | Move outside central Tokyo or to a regional city | Every ¥10,000/month saved cuts about ¥3 million |
| Coast FIRE | Invest early, then work a lighter job while investments grow untouched | Less pressure to save more each year |
| Passive income streams | Dividends, royalties or other income that pays part of your bills | Same math as Barista FIRE |
For ideas on building income streams in Japan, see Passive Income, Aggressive Retirement in Japan.
Where to Keep Your FIRE Money in Japan
- New NISA: gains and dividends are tax-free with no time limit, and you can sell at any time. This makes it the natural core of a FIRE portfolio.
- iDeCo: strong tax benefits, but money is generally locked until age 60. Useful for the long-term bucket, not the bridge bucket.
- Taxable accounts: gains and dividends are usually taxed at about 20.315%. If you report investment income on your tax return, it can also raise your National Health Insurance premium, so check how your account is set up.
- Cash: keep 1–2 years of spending in cash so you do not have to sell investments in a market crash.
Not sure which account to use first? Read New NISA vs iDeCo: Which Should You Use First for FIRE in Japan?
Important Note for Foreign Residents
If your residence status depends on your job (for example, a work visa), quitting work can affect your right to stay in Japan. Living on investments alone is usually not a basis for a work-related visa. Check your situation with the Immigration Services Agency or a qualified professional before you plan your FIRE date. Permanent residents and spouse-visa holders face different rules.
Also think about where you will live later. If you may return to your home country, check how the Japanese pension is paid abroad and whether a lump-sum withdrawal payment (脱退一時金) or a social security agreement applies to you.
Checklist: Calculate Your FIRE Number
- ☐ I tracked my real spending for at least 3 months.
- ☐ I added National Pension (¥17,920/month in FY2026) until age 60.
- ☐ I estimated National Health Insurance with my city's calculator.
- ☐ I set aside cash for the first-year health insurance and resident tax.
- ☐ I chose a withdrawal rate (3–4%) and calculated my number.
- ☐ I checked my pension estimate on ねんきん定期便 or ねんきんネット.
- ☐ I considered side income (Barista FIRE) to lower my target.
- ☐ I confirmed how quitting work affects my visa (foreign residents).
Frequently Asked Questions
Is ¥100 million (1億円) enough to retire early in Japan?
For many single people and couples with moderate spending, ¥100 million is enough even at a careful 3% withdrawal rate, which supports about ¥3 million a year. It depends on your rent, family size and lifestyle.
Can I retire early in Japan with ¥30 million?
At 4%, ¥30 million supports about ¥1.2 million a year, or ¥100,000 a month. That is rarely enough on its own, but it can work as Barista FIRE, combined with part-time income.
Do I have to keep paying National Pension after I retire early?
Generally, people aged 20–59 who live in Japan and are not covered by an employer plan must pay National Pension. If your income is low, you can apply for an exemption or reduction, but exempted periods reduce your future pension.
Is the 4% rule safe in Japan?
No withdrawal rate is guaranteed. The 4% rule was based on U.S. data and a 30-year retirement. For a longer early retirement, many people use 3–3.5% and stay flexible with spending.
Should I count my pension in my FIRE number?
Yes, but carefully. Use your own pension estimate, remember that retiring early lowers it, and plan for the years before 65 separately.
Final Thoughts
Your FIRE number in Japan is not just "spending × 25." It is spending + pension and health insurance + a first-year buffer, divided by a withdrawal rate you are comfortable with, then adjusted for your future pension and any side income.
Start with three numbers this week: your real monthly spending, your city's health insurance estimate, and your pension estimate. Once you have those, the rest is simple math.
Related Reading
- New NISA vs iDeCo: Which Should You Use First for FIRE in Japan?
- Passive Income, Aggressive Retirement in Japan
- Assessing Your Financial Situation
- Common Pitfalls in FIRE
- Personalized Pre-FIRE Productivity Plan
Sources: Statistics Bureau of Japan, Family Income and Expenditure Survey (2025); Japan Pension Service, pension amounts and National Pension premium for fiscal 2026. Figures are accurate to the best of our knowledge as of November 2026 and can change. Please check official sources for the latest information.
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