Most furusato nozei guides stop at "net cost ¥2,000." That's only true if you stay under your ceiling. Mio doesn't do vibes — the whole game here is estimating that ceiling before you click donate.
Furusato nozei isn't free money — it redirects tax you'd pay anyway. The government lets you deduct (your donation − ¥2,000) across income tax and resident tax, but only up to a point that scales with how much tax you owe. The binding cap is the resident-tax special deduction, which MIC limits to about 20% of your resident-tax "income levy" (shotokuwari) — and that levy itself grows with your income. So higher income → bigger resident tax → higher furusato nozei ceiling.
Say your true limit is ¥40,000 but you donate ¥70,000. The first ~¥40,000 works as intended (net ¥2,000). The extra ~¥30,000 is not refunded through tax at all — it becomes a plain donation. You still get gifts for it, but at ~30% value you're getting maybe ¥9,000 of goods for ¥30,000 of cash. That's the loss. The excess doesn't carry to next year either.
| Taxable income (approx.) | Rough furusato nozei limit |
|---|---|
| ¥3,000,000 | ~¥55,000–70,000 |
| ¥5,000,000 | ~¥110,000–140,000 |
| ¥7,000,000 | ~¥170,000–210,000 |
Very rough, illustrative ranges for a single person with no dependents and no other big deductions. "Taxable income" here is after basic deductions, not gross salary — your real number differs. Do not donate to these figures; run an official simulator first.
The table above assumes a simple single filer. Your real ceiling drops when other things already reduce your tax:
A dependent spouse (claimed as a deduction) lowers your resident tax, which lowers the furusato nozei cap — often noticeably. Dependent children, a housing-loan (mortgage) deduction, large medical-expense or iDeCo/insurance deductions all do the same: they cut your resident-tax income levy, so the ~20% ceiling shrinks. If you have several of these, your limit can be far below the single-person figure for the same salary.
Because the answer depends on your exact income and deductions, use an official simulator — the exact figure needs your income. A "simple" simulator asks only salary and whether you have a spouse; a "full/detailed" one asks for dependents and other deductions and is more accurate. Enter your numbers, donate at or under that limit, and stop there.
Then claim it. If you donated to 5 municipalities or fewer and don't otherwise file, the One-Stop Exception (submit a form to each town) handles the deduction through resident tax — no tax return. If you donated to 6+ towns, or you file a tax return anyway (e.g. for other reasons), you claim furusato nozei on your tax return (kakutei shinkoku) instead. See year-end adjustment vs. tax return → for which path is yours.