Tax Burden Varies Dramatically by Account Type
When drawing down assets in retirement, the order in which you withdraw from different accounts can significantly affect your tax burden. The main account types held by individual investors in Japan are taxable accounts (tokutei koza), NISA accounts (tax-exempt), and iDeCo/corporate DC accounts (eligible for retirement income deduction and public pension deduction). Because each has different tax rules, optimizing the withdrawal order can create a difference of several million yen in after-tax income from the same asset base.
The basic principle is "taxable accounts first, tax-exempt accounts last." Withdrawals from taxable accounts are subject to 20.315% tax on investment gains, while NISA accounts can continue to grow tax-free. By deferring withdrawals from tax-exempt accounts, you enjoy the tax-free compounding effect for longer. In a simulation of drawing down 30 million yen (3,000 man-yen) over 30 years, the difference in total after-tax proceeds between the optimal and worst withdrawal orders can reach 4 to 6 million yen (400-600 man-yen).
How iDeCo Withdrawal Methods Affect Your Tax Burden
iDeCo offers three withdrawal options: lump sum, annuity, or a combination. Each has different tax treatment. A lump-sum withdrawal qualifies for the retirement income deduction, which provides a tax-free allowance based on years of service (enrollment). Annuity withdrawals qualify for the public pension deduction, but since they are combined with public pension income, amounts exceeding the deduction are taxed as miscellaneous income.
The optimal withdrawal method depends on individual circumstances. guides on iDeCo withdrawal methods explain in detail that salaried employees with large retirement bonuses may have already used up their retirement income deduction on the bonus, making annuity withdrawals more advantageous for iDeCo. Conversely, freelancers with small retirement bonuses can maximize the retirement income deduction through a lump-sum withdrawal.
Withdrawal Strategies That Control Annual Taxable Income
An often-overlooked aspect of withdrawal order optimization is controlling annual taxable income. Japan's income tax is progressive, meaning the tax rate jumps when taxable income crosses certain thresholds. For example, taxable income up to 3.3 million yen (330 man-yen) is taxed at 10%, but amounts above that threshold are taxed at 20%. By adjusting the amount withdrawn from taxable accounts each year so that taxable income stays below these thresholds, you can minimize your lifetime tax burden.
Specifically, use your public pension income as the baseline and work backward to determine the withdrawal amount from taxable accounts. If the taxable portion of your public pension is 1.5 million yen (150 man-yen) per year, keeping taxable account withdrawals under 1.8 million yen (180 man-yen) maintains total taxable income below 3.3 million yen (330 man-yen). Cover any shortfall with tax-free withdrawals from your NISA account. books on post-retirement asset management and drawdown planning present optimal drawdown simulations that combine pension income with different account types.
Concrete Steps for Building Your Drawdown Plan
Preparing a drawdown plan before retirement can reduce your tax burden by millions of yen. Start by listing your asset balances by account type. Knowing exactly how much you have in taxable accounts, NISA accounts, and iDeCo/corporate DC is the starting point. Next, check your projected public pension amount on "Nenkin Net" (the pension information portal) and calculate the annual shortfall between your living expenses and pension income. Determining which accounts to draw from and in what order to cover this shortfall is the core of your plan.
As a concrete simulation, try working backward to ensure your post-retirement taxable income stays below 3.3 million yen (330 man-yen) per year. Withdraw from taxable accounts within the remaining allowance after subtracting the taxable portion of your public pension, and supplement any shortfall from your NISA account. Since the optimal iDeCo withdrawal method depends on the size of your retirement bonus, it is advisable to consult a tax accountant or financial planner two to three years before retirement. Early planning is the best way to maximize your after-tax income in retirement.