How Much a Month to Save ¥20 Million for Retirement? Working Back by Years and Return

Where the "¥20 million for retirement" figure comes from

It started with a 2019 report from a market working group of Japan's Financial System Council. For a retired couple with a husband 65 or older and a wife 60 or older, it estimated that spending exceeds pension and other income by about ¥55,000 a month, leaving a shortfall of about ¥13 million over 20 years and about ¥20 million over 30 years.

But that's one example based on the average household budget at the time. The amount you need varies widely depending on whether you own or rent, your pension, any retirement allowance and your standard of living. A realistic approach is to start with ¥20 million as a guide and then review the shortfall against your own budget. A ¥30,000 monthly shortfall comes to about ¥10.8 million over 30 years, and ¥80,000 comes to about ¥28.8 million.

Monthly contributions needed to reach ¥20 million

This works back to the monthly contribution for saving ¥20 million from zero, by years and return (contributing at month-end, monthly rate = annual rate ÷ 12).

With 30 years, investing at 5% gets you there on about ¥24,000 a month, less than half of saving alone (about ¥56,000). With only 10 years, you need about ¥129,000 a month even at 5%, and investing saves only about ¥38,000 compared with saving alone. The shorter the period, the less investing can close the gap, and the more it matters to secure the contribution itself.

At 5% over 20 years, contributing ¥48,658 a month gives a principal of about ¥11.68 million, with the remaining ¥8.32 million or so coming from gains. At 3% over 30 years, principal is about ¥12.36 million and gains about ¥7.64 million.

Targets of ¥5 million, ¥10 million and ¥30 million

Doubling the target exactly doubles the contribution needed. For amounts not in the table, scale a nearby row to get an estimate. For example, saving ¥15 million over 20 years at 5% is 1.5 times the ¥10 million row (¥24,329), or about ¥36,000.

If you already have savings

If you invest money you already have as a lump sum at the start, your monthly contribution falls accordingly. This compares aiming for ¥20 million over 20 years at 5%.

Investing ¥3 million at the start lowers the monthly contribution by about ¥20,000. But if you invest all your cash, every sudden expense could force you to sell assets that have fallen in value. The basic approach is to keep 6 months to 1 year of living expenses in deposits and use the rest as your initial investment.

How long it takes once you fix a monthly amount

Starting from the amount you can set aside each month, this shows the time needed to reach ¥20 million.

At ¥30,000 a month, savings alone take more than 55 years, while 5% gets you there in 26 years 8 months. Starting at 35, that's a pace that reaches the goal just past 60. Going from ¥20,000 to ¥30,000 a month saves about 6 years, and going from ¥30,000 to ¥50,000 saves another 7.

Work back from your own target

1. 1

   Enter the target and period

   On the "Work back from a goal" tab of the Savings & Compound Interest Simulator, enter the target amount (presets for 5M, 10M, 20M, 30M and 100M yen), money you already have, assumed return and period.

2. 2

   Check the monthly contribution needed

   You'll see the monthly contribution needed, the total you put in (principal), the amount covered by gains, and the difference from saving alone.

3. 3

   Find the years from what you can contribute

   Enter an amount under "How much you can contribute each month" to see the time needed to reach your target. A years × return quick-reference table also lets you compare terms.

For how to use the money after retirement, see retirement savings withdrawal simulation. For the future value of each contribution amount, see the regular investing quick-reference table.

FAQ

How much a month do I need to save ¥20 million in 20 years?

About ¥83,000 a month with savings alone, about ¥61,000 if invested at 3%, and about ¥49,000 at 5%. At 5%, principal is about ¥11.68 million, with the remaining ¥8.32 million or so covered by gains.

Can ¥30,000 a month reach ¥20 million?

Yes, but it takes time. Investing at 5% gets you there in 26 years 8 months, and at 3% in 32 years 9 months. Savings alone take 55 years 7 months, so if you aim for this amount, investing is a given.

How much a month do I need to save ¥10 million in 10 years?

About ¥83,000 a month with savings alone, about ¥72,000 at 3% and about ¥64,000 at 5%. With a short 10-year period, investing makes a difference of only about ¥20,000.

Do I really need ¥20 million for retirement?

It varies greatly from person to person. ¥20 million is the 2019 report's estimate for a deficit of about ¥55,000 a month lasting 30 years. You'll need less if you own your home and have no housing costs, have a larger pension, or receive a retirement allowance, and more if you rent or have a high standard of living. Work out your own shortfall from your expected pension and monthly spending.

Is it too late to start saving for retirement in my 40s?

For the 20 years from 45 to 65, the guide for ¥20 million is about ¥49,000 a month at 5% and about ¥61,000 at 3%. If you can use a retirement allowance or existing savings as an initial investment, the monthly amount falls further. For example, putting in ¥3 million at the start brings it to about ¥29,000 a month at 5%.