Retirement Savings Calculator
Enter your current age, retirement age, savings, expected return, monthly expenses, and pension to calculate how much you need to save each month to reach your retirement goal.
| Current Age |
yrs
|
|---|---|
| Retirement Age |
yrs
|
| Plan Until Age |
yrs
|
| Current Savings |
JPY
|
| Expected Return (Annual) |
%
|
| Monthly Expenses in Retirement |
JPY
|
| Monthly Pension Income |
JPY
|
Results are simulations only. Actual returns, pension amounts, and tax treatment will differ. Consult a financial professional for personal retirement planning.
What this retirement savings simulator does
The number that matters in retirement planning is not how much to save but how much falls short each month. If living costs run to 280,000 yen a month and your pension pays 150,000, the gap is 130,000. You need enough capital to cover that gap from the day you retire until the end of your planning horizon. This tool takes your current age, planned retirement age, assumed life expectancy, current savings, expected rate of return, post-retirement living costs and expected pension, and works out the capital you need on the day you stop working plus the monthly contribution that gets you there.
The required capital is not the monthly gap multiplied by the number of months. It is calculated as the present value of an annuity, which accounts for the fact that **the remaining balance keeps earning a return while you draw it down** — so the figure comes out lower than simple multiplication suggests. Note that inflation is not modelled separately. If you want to allow for rising prices, enter a real rate of return (your expected return minus your assumed inflation rate) rather than a nominal one. The pension is also treated as constant over time. Treat the output as a rough figure for setting direction: real outcomes depend on tax treatment, the age at which you claim, and your own circumstances. Consult a qualified adviser before making decisions that matter.
How to estimate what you need for retirement
- Enter the three ages Your current age, the age you plan to retire and the age you are planning through. Setting the last one beyond average life expectancy gives you the safer estimate.
- Enter your current savings The total financial assets available for retirement. If you still have a mortgage, subtract whatever is earmarked for paying it off.
- Enter your expected rate of return An annual figure. To allow for inflation, use a real rate — your expected return minus your inflation assumption. Deposit-heavy portfolios sit near zero; portfolios holding equities are typically a few per cent.
- Enter living costs and expected pension Both as monthly amounts. Using the projection from your official pension statement rather than a guess makes the whole calculation noticeably more reliable.
- Read the results You get the capital required at retirement, the monthly contribution needed and how long the money lasts. If the contribution looks unrealistic, change an input — push the retirement age back, or revisit the spending assumption — and run it again.
Tips for getting more out of it
- This calculator assumes a constant annual return compounded monthly. Since actual investment returns vary, using a conservative rate (2–3%) is recommended for planning purposes.
- Your public pension estimate can be found on your annual pension statement (Nenkin Teiki-bin) or via the Nenkin Net portal. If planning for a couple, enter the combined total.
- Setting the "Plan Until Age" higher than the average life expectancy (87 for women, 81 for men in Japan) is standard practice to manage longevity risk. 90 years is a common benchmark.
- Tax-advantaged accounts like NISA (Nippon Individual Savings Account) and iDeCo can significantly boost your retirement savings by sheltering investment gains from taxes.
- A common guideline is that retirement expenses run at 70–80% of pre-retirement income, as housing and commuting costs often decrease while travel and healthcare costs may rise.
When this simulation helps
Deciding how much to contribute each month
When setting up a regular investment, working backwards from a target gives you a specific figure. That is far easier to sustain than a vague intention to save as much as possible.
Seeing what a later retirement is worth
Retiring five years later adds five years of contributions and removes five years of withdrawals, so the required capital falls twice over. The size of that effect is hard to appreciate until you see it as a number.
Revisiting your spending assumption
You can see exactly how much the required capital drops if monthly costs fall by twenty thousand yen. That feeds into decisions like owning versus renting, or whether to keep a car.
Checking the age at which the money runs out
Even when contributions cannot go any higher, knowing how long your current assets last tells you when to start thinking about working longer or adjusting your spending.
Retirement planning terms
- Required retirement capital
- The total financial assets you want to hold on the day you retire. It is the amount that can cover the monthly shortfall right through to your planning horizon while the balance continues to earn the assumed return.
- Monthly shortfall
- Post-retirement living costs minus expected pension income. It never goes negative: if the pension covers your costs, the shortfall is zero and, in principle, no drawdown capital is needed.
- Present value of an annuity
- A fixed sum received (here, withdrawn) every month over a period, restated as a single amount today after allowing for investment returns. Because the balance keeps working, it is smaller than the simple multiplication.
- Asset longevity
- How many years the money lasts after retirement, or the age at which it runs out. Reaching your planning horizon means the target is met; running out earlier means there is a gap.
- Expected rate of return
- The annual return you assume across your whole portfolio. **This tool does not handle inflation separately, so enter a real rate — expected return minus inflation — if you want rising prices reflected.**
- Real rate of return
- The nominal return less the rate of inflation, expressed in purchasing power. Earning 3% a year while prices rise 2% a year leaves you just 1% better off in real terms.
Frequently Asked Questions
Side Note — The "¥20 Million Shortfall" Debate
In 2019, a report from Japan's Financial Services Agency estimated that a retired couple would need an additional ¥20 million beyond their public pension over 30 years. The estimate assumed a monthly shortfall of ¥55,000 and sparked a national debate about the sustainability of the pension system. While the exact figure depends on individual circumstances, the underlying point — that public pensions alone may not be enough — resonates widely.
Retirement income in Japan traditionally relies on three pillars: public pension (nenkin), company retirement benefits (taishokukin), and personal savings. As lifetime employment becomes less common and corporate retirement packages shrink, self-directed savings have become increasingly important. Starting in your 20s or 30s gives compound interest decades to work in your favor.
The "4% rule," popularized in the United States, suggests that withdrawing 4% of your portfolio annually allows it to last 30 years. For a ¥20 million portfolio, that's ¥800,000 per year (about ¥67,000/month). This rule is based on U.S. historical data; in Japan's low-interest environment, many financial planners use a more conservative 3–3.5% withdrawal rate instead.