Self-Medication Tax System Calculator (Japan)

Enter your annual purchases of eligible switch OTC medicines to estimate the deduction under Japan's Self-Medication Tax System (Act on Special Measures Concerning Taxation, Article 41-17) and the resulting income and resident tax refund.

Last updated: 2026-10-17

Estimating the deduction under Japan's self-medication tax relief

Enter the year's spending on qualifying over-the-counter medicines and this tool estimates the deduction under Article 41-17 of Japan's Act on Special Measures Concerning Taxation, together with the income tax and residence tax you stand to get back. The deduction is the amount spent less 12,000 yen, and it is capped at 88,000 yen.

What is overlooked most often about this relief is the requirement that you have undertaken one of the prescribed health measures. However much you may have spent on qualifying medicines, the relief does not apply unless you underwent something that year such as a full medical check-up, a statutory health examination, a vaccination or a metabolic screening. Judging by the spending alone leaves you to discover this when the return is already being drawn up. The other point concerns the ordinary medical expenses deduction, with which this relief cannot be combined. One or the other must be chosen for a given year, so the practical course is to estimate both and take whichever comes out better.

Sources used in this calculation

Statutory figures such as tax and insurance rates come from the public bodies listed below. They change when the law is revised, so please also check the primary source before relying on the result for an important decision.

Japan self-medication tax system deduction & validity period — National Tax Agency (国税庁) Effective 2022-01 to 2031-12 ／ Last checked 2026-09-25

How we source and maintain these figures

How to work it out

Enter the year's spending on qualifying medicines Add together the whole household's purchases. Qualifying products carry an identifying mark on the packaging and the receipt.
Choose your income tax band Pick the rate that corresponds to your taxable income; the refund follows from it.
Read the deduction and the estimated refund The deduction is the spending less 12,000 yen, capped at 88,000 yen.
Compare it with the medical expenses deduction Only one of the two may be used, so take whichever serves you better.

Tips for getting more out of it

Eligible products display an identification mark (such as a star) on the receipt, making it easy to tell which purchases qualify at tax time. Ask the pharmacy if you are unsure.
You can combine purchases made for family members who share your livelihood (a spouse or dependents), so keeping everyone's receipts together helps maximize the deduction.
You do not need to submit proof of your health-maintenance efforts (such as a checkup result notice or a vaccination receipt), but you must record the details on your tax return, so note the date and content in advance to make filing smoother.
Eligible medicines are added to or removed from the list each year, so check the Ministry of Health, Labour and Welfare or National Tax Agency websites for the current list.

Where it comes in useful

Estimating before filing a return

You can establish whether there is anything to claim at all before you start on the paperwork.

Deciding between this and the medical expenses deduction

It gives you the material to set the two estimates side by side.

Judging whether to keep the receipts

Entering your spending partway through the year shows whether they are worth collecting.

Considering whether to pool the household's purchases

Since a household may be added together, what falls short for one person can clear the threshold combined.

Terms in the self-medication relief

Switch OTC medicine: A medicine moved from prescription to over-the-counter sale. Qualifying products carry an identifying mark on the packaging.
The 12,000 yen floor: The threshold of the deduction. Spending up to this amount does not count towards it.
The 88,000 yen cap: The ceiling on the deduction. Spending beyond 100,000 yen brings no further relief.
Prescribed health measure: The condition of eligibility. You must have undergone, in the same year, a check-up, a health examination, a vaccination or a metabolic screening.
Medical expenses deduction: The deduction covering medical costs generally. It cannot be combined with this relief; one must be chosen.
Refund: Income tax overpaid and returned. The deduction multiplied by your rate gives the rough figure.

Frequently asked questions

It depends on your total medical costs and OTC purchases. The regular deduction covers medical costs above 100,000 yen (or 5% of total income if under 2 million yen), capped at 2 million yen, while the self-medication deduction covers eligible OTC purchases above 12,000 yen, capped at 88,000 yen. It is best to estimate both and compare.

The main eligible category is "switch OTC" medicines: over-the-counter drugs containing active ingredients that previously required a doctor's prescription. Eligible products are marked on the package and receipt, and the Ministry of Health, Labour and Welfare publishes the full list.

Yes, you must have undertaken at least one qualifying health effort during the year, such as a health checkup, a specific health checkup, or a vaccination. Since a routine workplace checkup or a flu shot both qualify, most salaried workers meet this requirement without extra effort.

You need a statement of eligible purchases (based on your receipts) and a tax return. You record your health-maintenance efforts on the return itself; supporting documents generally do not need to be submitted, though you should keep them in case they are requested later.

Side Note — The medical cost containment goal behind the Self-Medication Tax System

The Self-Medication Tax System was introduced in 2017 to encourage people with minor ailments to treat themselves with over-the-counter medicine rather than visiting a doctor, as part of an effort to contain Japan's rising medical costs. Ministry of Health, Labour and Welfare estimates suggested that hospital visits for conditions manageable without a doctor, such as colds or mild headaches, were pushing up overall medical spending, so the tax incentive was designed to reduce the number of such visits by making self-treatment more attractive.

The eligibility is limited to "switch OTC" medicines, rather than general health foods or supplements, because these products contain active ingredients that were originally available only by prescription. Limiting eligibility this way targets products with confirmed therapeutic effects. The word "switch" refers to the ingredient having switched classification from a prescription drug to an over-the-counter (OTC) medicine sold across the pharmacy counter.

The requirement to have undertaken a health checkup or vaccination exists so that the deduction rewards people who are already managing their health proactively, aligning the incentive with the broader policy goal of early detection and prevention of disease. This requirement originally demanded that supporting documents be submitted with the return, which was seen as a high filing hurdle; the fiscal 2021 tax reform simplified it so that, for returns filed on or after January 1, 2022, simply recording the details on the return is sufficient.

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