Taking a 20 Million Yen Retirement Payout: Lump Sum, Pension or Both
- The same retirement payout yields materially different net amounts depending on how it is taken.
- A lump sum is taxed as retirement income, calculated separately from other income.
- Taking it as a pension counts as miscellaneous income, combined with other earnings and affecting social insurance premiums.
- A split approach takes part as a lump sum and part as instalments to lower the applicable rate.
- The original article includes worked simulations; current deduction rules should be checked against National Tax Agency guidance.
For Taiwanese working in Japan, or anyone planning to retire there, this decision arrives eventually: a retirement payout can be taken as a lump sum, as instalments like a pension, or as a combination — and the choice changes how much you actually keep.
The three routes are taxed differently. A lump sum is treated as retirement income, calculated separately from other income and reduced by a deduction based on years of service, which usually makes it the lighter option. Instalments count as miscellaneous income, combined with other earnings for the year, and they also feed into health and other social insurance premium calculations — a cost that is easy to overlook. A split takes part each way, typically to keep any single year's income in a lower bracket.
Four factors decide which fits: length of service, whether you will have other income after retiring, whether you need a large sum at once, and which country you will live in afterwards.
For readers planning to return to Taiwan there is a currency layer too. With the yen near 158, converting one large sum differs materially from converting in annual slices, which spreads exchange-rate risk.
Confirm with your employer which scheme applies, then run the numbers on all three. Deduction rules change with tax revisions, so check current National Tax Agency guidance before deciding — the choice is usually irreversible once made.