Bonuses and RSUs

Your furusato nozei donation limit is not based on your base salary alone. It tracks your total taxable income for the calendar year, so anything that adds to your income, including bonuses and equity compensation, changes the number. This matters a lot for foreign professionals at multinationals, where a year-end bonus and a batch of vesting RSUs can shift income well beyond what monthly pay stubs suggest. If you estimate your limit using only your base salary, you risk setting it too low and leaving donation room on the table, or in some cases getting the timing wrong and donating against income that has not actually landed yet.

Bonuses count toward your limit (and timing)

Bonuses (賞与) are part of your annual employment income in Japan, just like your regular salary. When you estimate your income for the calculator, include your expected bonus for the year, not just your monthly pay. Leaving it out will understate your income and understate your limit, meaning you could safely have donated more.

The catch is timing. Many companies pay bonuses in summer and winter, with the winter bonus often landing in December, sometimes with the exact amount not confirmed until close to payday. Because furusato nozei donations must be made within the calendar year to count against that year's limit, this creates a real planning problem: donate early based on an optimistic bonus estimate, and a smaller-than-expected bonus could mean you have over-donated beyond your actual limit. A practical approach is to make a portion of your planned donations early in the year based on your base salary alone, then wait until your bonus is reasonably certain, often November or December, before making donations that assume the bonus amount.

RSUs at vesting are employment income (they raise the limit)

Restricted stock units (RSUs) are common at foreign-headquartered multinationals, and they interact with furusato nozei differently from how many people expect. For a Japanese tax resident, the value of shares at the moment they vest is taxable in Japan as employment income (給与所得), valued at the market price on the vesting date. This is not a capital gain and it is not taxed only when you eventually sell the shares; the vesting event itself creates taxable income.

Because this vesting income is added to your aggregated income for the year, it raises your furusato nozei limit, sometimes substantially, depending on how much stock vests and the share price on the vesting date. Someone with a large RSU grant vesting in a given year may find their real limit is much higher than a calculation based on salary and bonus alone would suggest. If you have RSUs vesting, track the vesting dates and the value at vesting throughout the year so you can factor this into your estimate before donating.

The reporting catch: foreign-parent RSUs and 確定申告

The reason this trips people up is practical rather than legal: RSU income paid by a foreign parent company is frequently not reflected on the 源泉徴収票 (withholding statement) issued by your Japanese employer, since the parent company, not your local employer, granted and settled the award. Japanese payroll systems generally only report what passed through Japanese payroll withholding. As a result, RSU vesting income commonly has to be self-reported by the employee, and once you are filing a 確定申告 for that reason, your furusato nozei deduction gets handled through the same return rather than through one-stop.

If you know you have RSU income to report, the practical move is to treat one-stop as unavailable from the start of the year and to keep every donation receipt (寄附金受領証明書) you receive from municipalities, since you will need them when you prepare your return.

Stock sales and ESPP: taxed separately (a nuance)

It is worth distinguishing RSU vesting from selling shares you already hold, including shares acquired through an employee stock purchase plan (ESPP) or shares you received earlier through RSU vesting and are now disposing of. Capital gains from ordinary sales of listed shares are generally taxed under a separate schedule (分離課税) rather than being combined with your salary and bonus income the way vesting income is. Because of this separate treatment, gains from selling listed shares usually do not raise your furusato nozei limit in the same direct way that salary, bonus, and RSU vesting income do.

This is a nuance with exceptions depending on the type of account, how the sale is reported, and your specific circumstances, so treat this as a general pattern rather than a rule to apply blindly. If a meaningful share sale is part of your year, it is worth confirming how it will be taxed in your specific case before assuming it does or does not affect your limit.

How to estimate

A reasonable estimate for someone with base salary, a bonus, and vesting RSUs is to add up three figures: your base salary for the year, your expected bonus, and the value of any RSUs vesting during the year at their vesting-date share price. Run that combined figure through the calculator to get a working limit.

• Update the estimate as your bonus amount is confirmed, generally in the months it is actually paid.
• Update the estimate again as RSU vesting events occur during the year, using the actual vesting-date value rather than the grant-date value.
• If any RSUs will vest late in the year, hold back some donation capacity rather than committing your full estimated limit early.
• If you have foreign-parent RSU income, assume you will file a 確定申告 and keep every donation receipt for that filing.
• If you also sold listed shares during the year, check separately whether that sale affects your aggregated income before folding it into the same estimate.

Because bonuses and RSU vesting can both change late in the year, professionals with either form of compensation are often better served by donating in stages rather than all at once early in the year, revisiting the estimate as each piece of income becomes certain.