Semi-retirement is a lifestyle in which you leave full-time employment and secure more free time while supplementing your income through part-time work or asset management. There is no single fixed definition, but unlike full retirement, its defining feature is maintaining a certain level of income. By combining asset building with an investment strategy, it can be achieved realistically even from your 30s.
How much money do you need for semi-retirement? A simulation by age group
The required funds are calculated as "(monthly living expenses - monthly income) × 12 months × (90 years old - retirement age)." The result varies significantly depending on monthly income, living expenses, and retirement age.
Case for your 30s (age 35)
If you retire at age 35 with a monthly income of 100,000 yen and living expenses of 170,000 yen:
（170,000 - 100,000）×12×55 years＝46.2 million yen
If your monthly income is 150,000 yen, the required assets fall to 13.2 million yen. Because a 50,000-yen difference in monthly income can change the required assets by more than 33 million yen, designing a reliable income plan is the highest priority.
Case for your 40s (age 45)
Under the same conditions, if you retire at age 45:
（170,000 - 100,000）×12×45 years＝37.8 million yen
Compared with retiring at 35, this can be achieved with about 8.4 million yen less in assets. If your monthly income is 150,000 yen, the amount drops sharply to 10.8 million yen.
Case for your 50s (age 55)
If you retire at age 55 with a monthly income of 100,000 yen and living expenses of 170,000 yen:
（170,000 - 100,000）×12×35 years＝29.4 million yen
Your 50s are a comparatively favorable stage for semi-retirement because you are more likely to have accumulated assets over many years. If your monthly income is 150,000 yen, the required amount is 8.4 million yen, bringing it below the 10 million yen level.
What are the benefits of semi-retirement?
- Financial stability: Unlike full retirement, having an income source helps reduce the risk of running out of money before pension benefits begin
- More free time: You can gain time while you are still healthy and before the standard retirement age, expanding your room to take on new challenges
- Relief from workplace relationships: By using part-time work or investment income, you can significantly reduce workplace stress
What risks should you watch for before semi-retirement?
Securing funds for emergencies
To prepare for illness, injury, or interrupted income, it is essential to set aside a buffer in addition to the calculated required assets. It is advisable to manage 6 to 12 months of living expenses separately as an emergency reserve.
Risk of reduced social creditworthiness
If you rely only on freelance or part-time income, it may become difficult to pass a home loan screening or obtain a new credit card. It is important to organize your loans before entering semi-retirement.
Underestimating investment risk
Investing does not guarantee a profit. You need an asset plan with a safety margin that allows you to maintain your lifestyle even when markets decline.
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Frequently Asked Questions (FAQ)
What is the difference between semi-retirement and early retirement (FIRE)?
FIRE refers to complete financial independence, where you live only on investment income. Semi-retirement differs in that you secure a certain level of income through part-time work or similar means while increasing your free time, which significantly reduces the amount of assets required.
What income sources work well after semi-retirement?
Common options include rental income from real estate, stock dividends, part-time work, and freelance work. Having multiple income sources helps diversify risk.
Should pension income be included in semi-retirement calculations?
It is possible to run the numbers based on receiving pension benefits from age 65 onward. However, if your full-time working period is short, the amount you receive may decrease, so it is important to confirm the actual projected amount through your pension statement.
What investment methods are suitable for semi-retirement?
Methods such as index investing and real estate investing, which require less effort and aim for stable income gains, are well suited. High-return, high-risk approaches require caution because they increase the risk of depleting your assets.
