🏖️ Retirement Calculator

Calculate how much you will have saved by retirement based on current savings, regular contributions, and expected returns.

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Complete Retirement Planning Guide: Building Your Retirement Fund in Japan

Understanding Retirement Savings in Japan: How Much Do You Really Need?

Japan's "old-age 20 million yen problem" (老後2000万円問題), raised in a 2019 Financial Services Agency report, estimated that a retired couple relying only on public pension income faces a monthly shortfall of roughly ¥50,000, adding up to about ¥20 million over a 30-year retirement. According to the Statistics Bureau's Family Income and Expenditure Survey, a retired couple household with no other income spends on average around ¥268,000 per month (2023 data), while average combined public pension income covers roughly ¥220,000-¥230,000 of that. Use a retirement calculator to model your current age, target retirement age (typically 65, though 60-70 is common), current savings, monthly contributions (often via iDeCo or NISA), and an expected annual return of around 3-5% for a diversified portfolio. Starting early makes an enormous difference: contributing ¥30,000/month from age 30 to 65 at a 5% annual return builds roughly ¥34 million, while starting at 45 yields only about ¥12 million. Factor in inflation (the Bank of Japan targets 2% annually) when projecting future living costs.

Japan's Public Pension System: Kokumin Nenkin and Kosei Nenkin

Japan's public pension has two tiers. Kokumin Nenkin (National Pension, 国民年金) is the basic pension all residents aged 20-59 must contribute to; the full monthly benefit for 2024 is approximately ¥68,000 for those with a complete 40-year contribution record. Kosei Nenkin (Employees' Pension, 厚生年金) is the earnings-related second tier for company employees and public servants, funded jointly by employee and employer at a combined rate of 18.3% of salary. Average combined pension income for a retired couple (one on Kosei Nenkin, spouse on Kokumin Nenkin) is roughly ¥220,000/month. The standard pension start age is 65, but you can start as early as 60 (benefit reduced up to 24%) or delay up to 75 (benefit increased up to 84% if delayed to 75, or 42% if delayed to 70). Self-employed individuals and freelancers only receive Kokumin Nenkin, making supplementary private savings especially important for this group.

iDeCo (Individual-type Defined Contribution Pension): Tax-Advantaged Retirement Savings

iDeCo lets individuals contribute pre-tax income into a personal investment account, with contributions fully deductible from taxable income. Monthly contribution limits depend on employment status: self-employed individuals can contribute up to ¥68,000, company employees without a corporate pension up to ¥23,000, employees with a corporate pension typically ¥12,000-¥20,000, and public servants up to ¥12,000 (2024 rules; limits for company-plan participants were revised in December 2024). Funds are locked until age 60 (or later if you start contributing after 60), and withdrawals are taxed favorably as retirement income or as an annuity with special deductions. Investment options typically include index funds tracking domestic and international stock markets, balanced funds, and principal-guaranteed deposits.

NISA (Nippon Individual Savings Account): Japan's Tax-Free Investment Program

The new NISA, effective from January 2024, made the program permanent and expanded limits significantly. It has two components usable simultaneously: the Tsumitate (accumulation) investment quota allows up to ¥1.2 million per year in eligible index funds, while the Growth investment quota allows up to ¥2.4 million per year in a broader range of stocks and funds. The combined lifetime tax-free holding limit is ¥18 million. Unlike iDeCo, NISA funds can be withdrawn at any time without penalty, making it a flexible complement to retirement-specific accounts. Investment gains and dividends within NISA are completely tax-free, compared to the standard 20.315% tax on investment gains outside NISA.

Retirement Allowance (Taishokukin): Lump-Sum Severance Pay

Many Japanese companies pay a one-time retirement allowance (退職金) upon resignation or retirement, calculated by tenure, position, and reason for leaving. Ministry of Health, Labour and Welfare surveys put the average lump-sum retirement payment for university graduates retiring after 35+ years of service at roughly ¥19-20 million at large companies, though amounts have trended downward and vary widely by company size and industry, with smaller firms paying considerably less. Retirement allowances receive favorable tax treatment through the "退職所得控除" (retirement income deduction), which increases with years of service, meaningfully reducing the taxable portion. Because the practice is not guaranteed at all employers and is shrinking over time, retirement calculators should treat this as a supplementary source, not a substitute for pension and personal savings.

Asset Allocation for Retirement: Adjusting Risk by Age

A traditional guideline suggests holding a percentage of stocks roughly equal to 100 (or 110) minus your age, shifting toward bonds and deposits as retirement nears. In your 20s-30s, an aggressive allocation of 80-90% in equities (often through low-cost index funds tracking Japan's TOPIX/Nikkei 225 and global indices such as the S&P 500 or an all-country world index) is common within NISA and iDeCo. In your 40s-50s, many advisors suggest shifting to 60-70% equities with the remainder in bonds and JGBs (Japanese Government Bonds). In your 60s and beyond, moving to 40-50% equities balances continued growth against capital preservation. Because Japanese bank deposits pay near-zero interest, many retirees supplement fixed income with dividend-paying stocks and J-REITs for cash flow.

Healthcare and Long-Term Care Costs in Retirement

Japan's universal health insurance covers most medical costs, with patients generally paying 30% out-of-pocket until age 70, dropping to 20% (ages 70-74), and then to 10-20% under the Late-Stage Elderly Healthcare System (後期高齢者医療制度) from age 75, with a 20-30% co-pay for higher-income retirees since a 2022 reform. A high-cost medical expense cap (高額療養費制度) limits monthly out-of-pocket spending regardless of treatment cost. Long-term care insurance (介護保険), which all residents aged 40+ pay premiums into, covers a large share of nursing and home-care costs from age 65 (or earlier for specific conditions), with users typically paying 10-30% co-insurance depending on income. Even so, retirees should budget for co-pays, non-covered services, and potential nursing-home costs, which can run ¥150,000-¥300,000+ per month at private facilities.

Catching Up: Strategies If You're Starting Late on Retirement Savings

If you're behind on savings, several catch-up strategies can help. Maximize iDeCo and NISA contributions immediately, since both offer tax advantages that compound over time. Consider working past the standard retirement age—many Japanese companies now offer continued employment to 65 or beyond under the Elderly Employment Stabilization Act, and delaying your pension claim to 70 or later meaningfully boosts your monthly benefit. Pay down high-interest debt before retirement. Consider downsizing your home, especially in expensive urban areas such as Tokyo, to free up capital. Reassess retirement living costs realistically using the Statistics Bureau's household expenditure data as a benchmark, and consider relocating to a lower cost-of-living region. Consult a licensed financial planner (ファイナンシャルプランナー, CFP/AFP-certified) for a personalized plan.

Building Multiple Retirement Income Streams in Japan

A resilient retirement plan typically combines several income sources rather than relying on one. The base layer is public pension (Kokumin Nenkin plus Kosei Nenkin for employees). A second layer comes from tax-advantaged personal savings—iDeCo and NISA withdrawals. A one-time retirement allowance, where available, adds a third source. Continued part-time or contract work after formal retirement, increasingly common and supported by government employment programs for seniors, provides a fourth stream. Rental income from real estate, dividend income from a stock portfolio, and private annuities (個人年金保険) can further diversify. Building 3-4 distinct income sources reduces the risk that any single source—such as a market downturn or reduced pension benefits—derails your retirement plan.

Questions fréquentes

What annual return should I use in the calculator?

A common assumption for a diversified NISA/iDeCo portfolio is 3-5% per year, but returns are never guaranteed. Try running the calculator at a few different rates (e.g. 3%, 4%, 5%) to see a range of outcomes rather than relying on a single number.

Does this calculator account for Japan's public pension (Kokumin Nenkin/Kosei Nenkin)?

No, the calculator only projects your personal savings, contributions, and investment growth. You should add your expected pension income separately when deciding whether your total retirement income will cover your living costs.

What retirement age should I enter?

Japan's standard pension age is 65, though many people plan around 60-70 depending on when they intend to stop working or start claiming their pension. Enter the age you personally expect to retire, not necessarily the pension start age.

Should I include my iDeCo and NISA balances as "current savings"?

Yes, include any existing iDeCo, NISA, and other investment or deposit balances earmarked for retirement as your starting savings, and use "monthly contribution" for what you regularly add to those accounts going forward.

How does starting age affect the result so much?

Because returns compound over time, money contributed in your 20s and 30s has many more years to grow than money contributed in your 40s and 50s. Even a modest monthly contribution started early can outgrow a larger contribution started late.