Furusato-tax limit x point activity: the core is grasping your own deduction limit with a simulator and donating within it

Exceeding the limit just increases your out-of-pocket cost — understand the mechanism before worrying about the amount

Furusato tax is often described as "a system where you get return gifts for just ¥2,000 out-of-pocket," but that ¥2,000 figure only holds when you donate within your deduction limit. Even one yen over the limit, and that excess receives zero deduction — it becomes entirely out-of-pocket. Donating beyond your limit for the sake of return gifts, only to end up spending more than you would have bought them outright, is the single most common reason people say they "lost money" on furusato tax.

The limit varies greatly from person to person depending on annual income, household composition, and other deductions (mortgage deduction, medical expense deduction, etc.). Even at the same income, the presence of a spouse, number of dependents, and whether you own a home all affect the result — so a generic table of "earn ¥○○M → limit is ¥○○" is just a rough guide. You must check your own numbers with a simulator every year.

There is also one more important change: as of October 1, 2025, point-related rules for furusato tax changed dramatically. Under a directive from Japan's Ministry of Internal Affairs and Communications (MIC), the following are now fully banned: point rewards via point-activity sites (point-back sites) and portal-exclusive point programs. The formerly popular tactic of "stacking double or triple points via a point site" is no longer possible. The only remaining cashback option is the regular points earned from the credit card you use to make the donation. The system itself remains worthwhile through its deduction + return gifts, but you need to size your donations based on realistic return expectations.

This article walks through the deduction mechanism, how the limit is determined, how to use a simulator, the post-2025 points landscape, how to choose your deduction filing method, and common pitfalls. Always confirm your exact limit with each furusato-tax portal's simulator or your local tax office. See also the One-Stop Exception guide, the furusato-tax points guide, and the tax payment cashback guide.

How the deduction works — income tax refund plus residence tax reduction in two stages

The furusato-tax deduction operates in two stages: a refund from income tax and a reduction in residence tax. Understanding this structure makes it clear what happens when you exceed the limit.

Income tax refund: If you file a tax return, a portion of your donation above ¥2,000 is refunded from your income tax. The refund amount depends on your income tax rate (higher rate = larger income-tax portion). If you choose the One-Stop Exception instead, this income-tax refund portion is redirected and applied entirely to your residence tax instead.

Residence tax reduction: Your next year's residence tax is reduced. With a tax return, this is the sum of a "basic deduction" and a "special deduction" portion; with the One-Stop Exception, the full amount — including what would have been the income-tax refund — is applied to the residence tax. Because the reduction shows up when you pay next year's residence tax, there is a time lag: "donate this year → residence tax decreases next year."

The residence tax special deduction has a cap of roughly 20% of the resident tax income levy (shotoku-wari). This cap is effectively the main factor that determines your furusato-tax deduction limit. Since the income levy itself changes with income, household composition, and various deductions, the limit differs significantly from person to person.

Another point to grasp is "the time lag in money coming back." With furusato tax, money goes out first in the year you donate, and what comes back as deductions (income-tax refund, next fiscal year’s reduced resident tax) arrives the following year. In other words, in household cash-flow terms it’s a "pay first, get back later" structure — you don’t gain the moment you donate. Especially when you donate in a lump at year-end, the burden in the month the spending precedes feels larger. The logic that "within the limit, the effective burden is small" is correct, but the return comes the next year — understanding this lag and donating within a comfortable range is safe.

How the limit is determined — three axes: income, household, and other deductions

There is no single answer like "earn ¥○○M → limit is ¥○○." The limit is calculated per individual based on the combination of three axes below.

① Salary / taxable income level

As income rises, taxable income rises, pushing up both the income tax rate and the resident tax income levy. As a result, the furusato-tax deduction limit also tends to rise. However it does not rise linearly with income; it shifts at tax bracket thresholds. Also, the basis for calculation is "taxable income" — gross income minus non-taxable deductions like the salary income deduction — so gross income alone is not enough to calculate the limit.

② Household composition (number of dependents)

More dependents mean more deductions available (dependent deduction, spouse deduction, special spouse deduction), which reduces taxable income and therefore lowers the resident tax income levy. This pushes the limit down. Two people earning the same income can have very different limits — "single," "spouse only," and "two children" each produce a different result. Generally, the more dependents you have, the lower the limit.

③ Interaction with other deductions

The mortgage tax credit (jutaku kariirekin-to tokubetsu koujyo) is a deduction taken directly from income tax. If the mortgage credit is so large that it brings income tax to zero, the income-tax refund portion of furusato tax shrinks or disappears, changing the net benefit. Similarly, deductions that reduce taxable income — medical expense deductions, casualty loss deductions — lower the resident tax income levy, which in turn lowers the furusato-tax limit. When multiple deductions overlap, always use a simulator or consult a tax accountant or the tax office.

The limit changes every year. A pay raise, job change, marriage, childbirth, home purchase, or swings in medical spending — all of these affect the limit for that year. Assuming "same amount as last year is safe" is dangerous. Check with a simulator every year without exception.

How to use a simulator and its limits — treat it as a "guide," do a final check at year-end

Major furusato-tax portals (Satofull, Furusato Choice, Rakuten Furusato Tax, Furunavi, etc.) each offer a deduction-limit simulator. Input fields typically include: "annual salary (or, for tax-return filers, income amount)," "household composition and number of dependents," "whether you have a mortgage credit and its amount," and "whether you claim a medical expense deduction." The output is a "guide deduction limit."

Steps for using a simulator

1. ① Have your withholding slip or pay stub readyTo input income and deduction amounts accurately, prepare your withholding slip (issued by your employer in December or January) or a recent pay stub. Mid-year, use your estimated annual income for the year.
2. ② Confirm household composition and dependent informationEnter accurately: presence of a spouse and their income, the number of dependents aged 16 or older. Children under 16 are not eligible for the dependent deduction, and simulator input fields may differ accordingly.
3. ③ Enter the mortgage credit and other deductionsEnter the annual credit amount for the mortgage tax credit (jutaku kariirekin-to tokubetsu koujyo) and the estimated medical expense deduction amount if applicable. These affect the limit.
4. ④ Set the result as your ceiling and donate with some bufferThe simulator result is a "guide," not a precise guarantee. Set your actual donations a little below the guide figure and use any remaining allowance at year-end — this is the safer approach.
5. ⑤ Recheck when your withholding slip arrives at year-end (Nov–Dec)Once your employer issues the withholding slip at year-end, run the simulator again with the confirmed income and deduction figures. If you find you've already exceeded the limit there's nothing you can do for this year, but be careful the following year.

The MIC also operates its own furusato-tax portal with a calculation tool — search for "furusato tax simulator" (furusato nouzei simulator) to find it. Comparing results across multiple simulators gives added confidence.

Don’t "run the simulator once and be done"; it’s safer to use it in two stages: once on an estimate basis mid-year, and again on a confirmed basis at year-end. Mid-year, hold a rough cap guide with your estimated annual income and donate conservatively. Then when your withholding slip comes at year-end, recalculate with confirmed income and deductions, and decide on additional donations within the remaining limit. Simulators of different furusato-tax portals can have slightly different input items and assumptions, so cross-checking results with two or more tools is more reassuring. If results diverge, take the lower one; in years where multiple deductions like home-loan and medical-expense deductions overlap, it’s surest not to judge alone but to confirm with the tax office or a tax accountant.

The points landscape after October 2025 — point-site routing rewards are now fully banned

From October 1, 2025, the rules around point awards for furusato tax changed dramatically. Under an MIC directive, the following are now fully prohibited:

• Portal-exclusive point programs: Portals awarding their own points for donations — such as Rakuten Points accrual on Rakuten Furusato Tax, or Satofull point campaigns — are banned.
• Point-site routing rewards: The mechanism of routing donors through point-activity sites (Moppy, Hapitas, Point Income, etc.) to furusato-tax portals and awarding points for the referral is banned.

The once-popular strategy of "route through a point site → Rakuten Furusato Tax → Rakuten Points" for double or triple stacking is no longer possible after October 2025. Point-site furusato-tax listings have disappeared, and portals no longer run exclusive point programs for donations.

What reward options remain

The only remaining reward option is the regular credit card points earned from the card used to make the donation. Paying by credit card earns the card's standard reward points. However, reward rates and eligibility vary by card, so check each card's official terms for up-to-date information.

The loss of point stacking does not make furusato tax a "bad deal." The core value of the system — receiving return gifts (food, household goods, experiences) for a ¥2,000 net outlay — has not changed. It simply means returning to the original use case: receiving return gifts through tax deductions, within the deduction limit, without expecting extra point bonuses on top.

Reframing it, this change is actually healthy. When point rewards were large, the motive of "donate right up to the limit, or even beyond, to maximize rewards" tended to kick in, sometimes inviting overage = self-burden. With the reward top-up gone, you can instead focus on the system’s original use: "choosing the return gifts you truly want, within your limit." Choose recipients not by the height of a reward rate but by "whether the return gift’s contents are useful in your life," and stay within the limit — this is the right way to engage with furusato tax after the point ban. For the overall positioning of points play using this system, also check our furusato-tax points guide (that referral rewards are currently impossible is a premise there too).

Choosing your deduction filing method — One-Stop Exception vs. tax return

Just donating is not enough — furusato tax requires you to file either the "One-Stop Exception" or a "tax return" to claim the deduction. Which you choose depends on your personal situation.

Conditions to use the One-Stop Exception

• Salaried employee who does not file a tax return: In any year you file a tax return — for a medical expense deduction, first-year mortgage credit, side income, etc. — the One-Stop Exception is voided and the donation must be included in the tax return.
• Donations to 5 or fewer municipalities: Donating to 6 or more municipalities in the same year disqualifies you from the One-Stop Exception; a tax return is required.
• Meet the application deadline: Must arrive by January 10 of the following year (mailed to each municipality). Missing the deadline voids the application; you must use a tax return instead.

Common situations that require a tax return

• You want to claim a medical expense deduction (file everything together on the tax return)
• First year of mortgage tax credit (from the second year onward it can be handled through year-end adjustment)
• You have side income, freelance work, rental income, or other income requiring a filing
• You donated to 6 or more municipalities through furusato tax
• You failed to submit the One-Stop application by January 10

If you chose the One-Stop Exception but later realize you need to file a tax return, just add the donation deduction to your return. Any One-Stop application you submitted becomes void, but you won't lose anything — the tax-return deduction takes effect. When in doubt, a tax return is the more flexible option. See the One-Stop Exception detail guide for more.

Common pitfalls and how to avoid them

• Running the simulator once at the start of the year and ignoring it after that: A job change, pay raise, new baby, or home purchase during the year can shift your limit. Get into the habit of rechecking when your withholding slip arrives at year-end.
• Taking a generic table's "earn ¥○○M → limit ¥○○" at face value: Those tables assume "single, no dependents, no other deductions." A mortgage or multiple dependents can significantly lower the real limit. Always run the simulator with your own inputs.
• Using multiple portals and losing count of municipalities: Using Rakuten Furusato Tax, Satofull, Furusato Choice, and others simultaneously can push you past 6 municipalities without realizing it. If you want the One-Stop Exception, track the total count and stay at 5 or fewer.
• Forgetting to submit the One-Stop application or missing the January 10 deadline: If you leave it too long after donating, you may miss the deadline. Fill out and mail the application immediately after donating, or use a portal that supports online submission.
• Last-minute year-end donations that hit payment or delivery problems: Donations by December 31 count for that year's deduction, but server congestion and delivery delays are common at year-end. Aim to complete donations in early to mid-December.
• Assuming "routing through a point site still earns points" based on old information: After October 2025, both point-site routing and portal-exclusive points are banned. Acting on old information expecting point rewards will yield nothing.
• Overlooking the interaction with a large mortgage tax credit: If your mortgage credit is large enough to wipe out your income tax entirely, the income-tax refund component of furusato tax becomes zero. The residence-tax deduction via One-Stop or tax return still applies, but the limit calculation is affected — check in advance.

Mini glossary — key terms for furusato-tax deduction limits

Understanding the core terminology around the deduction mechanism and limits helps you avoid costly mistakes. Learn each term alongside the "watch out" note for loss prevention.

These are the foundational concepts for understanding furusato-tax deduction limits. Focus on the mechanism, not just the amount — exceeding the limit means the excess is entirely out-of-pocket, making the purchase more expensive than buying outright. The limit varies by person based on income, household composition, and other deductions, and changes every year — always verify with a simulator and donate with a small buffer. Claiming the deduction requires filing via the One-Stop Exception or a tax return without exception. Note that point-site routing rewards and portal-exclusive point programs are now both banned; the only remaining reward is the regular points from the credit card used for the donation (see main article for details).

FAQ