Self-Medication Tax System × Points|Stacking Cashback and Tax Savings, vs. the Medical-Expense Deduction

Deep dives Published:2026-06-04 5 min read

The Self-Medication Tax System × Points — Stacking "Payment Cashback" and "Tax Savings"

Japan's self-medication tax system lets you potentially get an income deduction at tax filing — saving tax — when you buy a certain amount or more of eligible OTC medicines (switch OTC, etc.) at drugstores. Since it's an alternative to the medical-expense deduction, even people without large medical bills can sometimes use it. Combined with points, the two-stage play works well: pay for eligible medicines with a cashback method to get payment cashback while saving tax via the deduction.

As a major premise here, though, keep in mind that the real gain is "using necessary medicines appropriately," not buying medicines you don't need for points or tax savings. This system can't be combined with the medical-expense deduction (it's a choice between them), and it has requirements such as having had a certain health check or vaccination. Whether something is eligible, and which is more favorable, varies by individual, so it's safest to confirm with National Tax Agency information or a tax accountant. This article organizes the mechanism, checking eligible products, choosing between this and the medical-expense deduction, combining with payment cashback, and the filing flow. For the medical-expense deduction see the medical-expense deduction guide, for filing the tax-filing guide, and for drugstores the drugstore guide.

The Mechanism and the "Two-Stage Gain"

The self-medication tax system × points stacks two different kinds of gain. Importantly, both presume "the purchase of medicines you genuinely need."

Type of gainContentPremise
① Payment cashbackPay for eligible products with a cashback methodPremised on buying necessary medicines
② Tax savings via income deductionDeduction when annual eligible purchases exceed the thresholdMust meet requirements and file a return

※ Deduction requirements, scope, and calculation vary by the system and individual circumstances. There are also conditions like a certain health check or vaccination. For an accurate judgment, confirm with National Tax Agency information or a tax accountant. For the latest on points, check Pointnavi. For choosing a common-point program, see the common-points comparison.

Checking Eligible Medicines and Receipts

What qualifies for the deduction here is designated medicines such as switch OTC. Not all over-the-counter drugs are eligible, so it's important to make a habit of checking eligibility at purchase.

  • Check the eligibility mark: eligible products often carry a mark on the receipt indicating eligibility. Distinguish eligible from ineligible.
  • Combine family purchases too: purchases by family members of the same household may be combinable in some cases. Track the annual purchase total.
  • Keep a year of receipts: to claim the deduction, you need to keep eligible-product receipts. Organize them alongside payment statements.

The "Choice" vs. the Medical-Expense Deduction — Estimate Which Is Favorable

The self-medication tax system and the medical-expense deduction are mutually exclusive; you can't use both in the same year. Which is favorable depends on that year's medical expenses and eligible-medicine purchases.

SituationSystem likely to be favorable
A year with large medical bills (hospitalization, surgery)Medical-expense deduction
Low medical bills but mainly eligible-OTC purchasesSelf-medication tax system
Both applyEstimate both and choose the favorable one

For details on the medical-expense deduction, see the medical-expense deduction guide. When unsure, confirm with National Tax Agency information or a tax accountant.

Steps to Not Miss Payment Cashback + Tax Savings

  1. ① Pay for eligible medicines with cashbackWhen buying eligible OTC at drugstores, use a cashback card or code payment. You get payment cashback and a record for the deduction. Drugstore guide & tap-payment guide.
  2. ② Check eligible products and receiptsConfirm the eligibility mark, and track the annual eligible-purchase total including family. Keep a year of receipts.
  3. ③ Meet the requirements (health check, vaccination, etc.)This system requires having had a certain health check or vaccination. Have the records ready.
  4. ④ Choose the favorable one vs. the medical-expense deductionCompare the year's medical expenses and eligible purchases, estimate both, and choose the favorable option.
  5. ⑤ Claim the deduction at filing / consolidate pointsIf over the threshold, claim at filing. e-Tax lets you file from home. Consolidate payment-cashback points and use within expiry. Tax-filing guide & anti-expiry guide.

Common Mistakes and How to Avoid Them

  • Buying unneeded medicines for cashback/tax savings: the real gain is using necessary medicines appropriately. Don't make unnecessary purchases.
  • Counting ineligible products without checking: eligible items are switch OTC, etc. Distinguish by the eligibility mark on the receipt.
  • Throwing away receipts and being unable to claim: you need a year of eligible-product receipts. Organize them with payment statements.
  • Trying to double-claim with the medical-expense deduction: they're mutually exclusive. Choose the favorable one.
  • Not meeting the health-check requirement: a certain health check/vaccination is required. Confirm your records.
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The real gain is "using necessary medicines appropriately," not buying medicines you don't need for points or tax savings. The self-medication tax system is mutually exclusive with the medical-expense deduction, and has requirements such as having had a certain health check or vaccination. Whether something is eligible, and which deduction is more favorable, varies greatly by individual, so when unsure, confirm with National Tax Agency information or a professional such as a tax accountant. Medicine should be used appropriately for your symptoms and constitution; stockpiling or overuse can harm your health. The proper approach is always "handling medicines you genuinely need rewardingly and correctly via payment cashback plus the deduction."

Prep to Have Ready Before Starting

  • A cashback payment method: decide the card or code payment to use for drugstore purchases.
  • A receipt-keeping system: prepare a way to collect a year of eligible-product receipts (envelope, app, etc.).
  • Health-check/vaccination records: keep records that meet the requirement (result notices, receipts, etc.).
  • Know your annual medical expenses: record medical expenses too, to estimate which deduction is favorable.
  • Prepare for filing: an e-Tax environment, My Number card, etc. Tax-filing guide.
💡

The core of the self-medication tax system × points is to pay for eligible medicines you genuinely need with a cashback method to get payment cashback, and, if you meet the requirements, save tax via the deduction. Even people with low medical bills can sometimes use it once eligible purchases exceed a threshold. But buying unneeded medicines defeats the purpose. Handle what you actually need correctly, and confirm the favorability with a professional too.

FAQ

What is the self-medication tax system?
It's a system letting you get an income deduction at tax filing when you buy a certain amount or more of eligible OTC medicines (switch OTC, etc.) at drugstores. It's an alternative to the medical-expense deduction, so even people without large medical bills can sometimes use it. It has requirements such as having had a certain health check or vaccination.
Which is better, this or the medical-expense deduction?
Which is favorable depends on the year's medical expenses and eligible-medicine purchases. They're mutually exclusive, so in years with high medical bills the medical-expense deduction may be better, and in years centered on eligible-medicine purchases the self-medication tax system may be. Estimate both and choose the favorable one. Confirm with National Tax Agency information or a tax accountant.
How do I combine it with points?
Paying for eligible medicines with a cashback credit card or code payment gives you payment cashback while recording an eligible purchase for the deduction. You make drugstore shopping itself rewarding, and if you meet the requirements, it can also save tax. But don't buy unneeded medicines for cashback or tax savings — handle what you actually need.
How do I tell which medicines are eligible?
Eligible items are designated medicines such as switch OTC; not all over-the-counter drugs qualify. Eligible products often carry a mark indicating eligibility on the receipt, so check eligibility at purchase. Family purchases may be combinable, so tracking the annual eligible-purchase total makes filing smoother.
What should I watch out for?
Don't buy unneeded medicines for cashback or tax savings (the real gain is using necessary medicines appropriately). It's mutually exclusive with the medical-expense deduction, and has requirements like a certain health check/vaccination. Keep a year of eligible-product receipts. Eligibility and favorability vary by individual, so when unsure, confirm with National Tax Agency information or a tax accountant. Use payment-cashback points before expiry.

This article was written from publicly available information on each point site as of May 2026. Cashback rates, campaign terms, and redemption rules can change without notice — always check each site's official page for the latest. This site uses each point site's referral program, but going through a referral link never changes the rate you receive.