Estimating the Income You Need After Retirement
Post-retirement living expenses are often said to be 70-80% of working-age expenses, but in practice individual variation is large. According to Japan's Ministry of Internal Affairs and Communications Household Survey, the average monthly expenditure for married couples aged 65 and over is about 25-28 man-yen. Adding increased medical costs, home maintenance, and hobby and travel expenses, a comfortable retirement is said to require 35-38 man-yen per month. Meanwhile, the average combined public pension for a married couple is about 22-25 man-yen per month, leaving a monthly shortfall of 10-15 man-yen.
To cover this shortfall for 30 years (age 65 to 95), you need 3,600-5,400 man-yen in assets. The so-called "20 million yen retirement problem" is a bare-minimum estimate; for a comfortable life, preparing 4,000-5,000 man-yen is a more realistic target. If you have a retirement lump sum, you can subtract that, but the average retirement payment is about 2,000 man-yen at large companies and about 1,000 man-yen at small and medium enterprises - not enough to cover the full amount.
Designing a Three-Pillar Income Structure
Post-retirement income should be designed around three pillars: public pension, dividend and interest income, and asset drawdowns. If you choose to defer your public pension (up to age 75), it increases by 0.7% per month of deferral - deferring to age 70 yields a 42% increase, and to age 75 an 84% increase. A pension of 15 man-yen per month at age 65 would grow to about 21.3 man-yen if deferred to age 70, making deferral a compelling option if you can cover living expenses from age 65 to 70 with other income sources.
Dividend income can generate stable cash flow by combining high-dividend stocks and REITs. Books on dividend income and income investing show that holding a portfolio with a 3-4% dividend yield worth 3,000 man-yen generates 90-120 man-yen per year (7.5-10 man-yen per month) in dividend income. However, since dividends carry the risk of being cut, diversifying across multiple stocks and sectors is important.
Determining the Optimal Pace of Asset Drawdowns
For asset drawdowns, the "4% rule" is widely known. This method involves withdrawing 4% of your assets at retirement in the first year, then adjusting the withdrawal amount for inflation in subsequent years. U.S. research shows a greater than 95% probability that assets will not be depleted over 30 years. However, this research is based on U.S. historical data, and in Japan's low-interest-rate environment, reducing the rate to 3-3.5% is safer.
The order of drawdowns is also an important strategy. Generally, drawing down taxable account assets first and leaving NISA and iDeCo tax-free assets for later minimizes the tax burden. Books on asset drawdown and retirement strategies provide detailed explanations of flexible drawdown strategies that adapt to age and market conditions.
Steps to Start Designing Your Post-Retirement Income Now
Ideally, you should start designing your post-retirement income 10-15 years before retirement. First, check your projected pension amount on "Nenkin Net" (Japan's pension information portal) to establish the baseline of your monthly post-retirement income. Next, calculate your expected post-retirement monthly expenses and determine how much the monthly gap with your pension will be. This gap multiplied by 12 months multiplied by 30 years (age 65 to 95) gives you a rough target for the assets you need to prepare by retirement.
As a concrete action, in your 40s maximize your contributions to iDeCo and NISA, and from your late 50s gradually shift your portfolio toward stable assets (bonds, high-dividend stocks). Five years before retirement, organize the information needed to decide whether to defer your pension, and secure enough cash and bonds to cover living expenses from age 65 to 70. Design your post-retirement income around the three pillars of "pension," "dividends," and "drawdowns," and summarize in a table when each pillar starts and how much it provides - this will give you a retirement plan you can feel confident about.