You paid for education, medical treatment, or bought an apartment with a mortgage — and you have the right to get part of the money back from the budget. But many people lose this money: they don't know the limits, collect the wrong certificates, miss deadlines, or calculate the amount incorrectly. As a result, the state returns less than it could, and sometimes refuses altogether.
Let's break down step by step how to calculate your deduction, what documents are needed for each type, and where to hedge your bets. And we'll also show you which routine tasks can be delegated to an AI twin and what you'll still have to do yourself.
Three Types of Deductions and Their Limits
A tax deduction is the amount by which your income subject to 13% personal income tax (NDFL) is reduced. You can get back not the entire amount of expenses, but 13% of them, and no more than from the established limit.
Here are the main types and limits (according to the Tax Code of the Russian Federation):
| Type of deduction | Maximum amount of expenses | How much will be returned (13%) |
|---|---|---|
| Education (your own, children's, brothers/sisters') | 120,000 RUB per year (for your own education together with treatment and other social deductions), for children's education — up to 50,000 RUB per child | Up to 15,600 RUB (from the total amount), for children — up to 6,500 RUB per child |
| Treatment (except expensive treatment) | 120,000 RUB per year (included in the same limit as education) | Up to 15,600 RUB |
| Expensive treatment | No limit | 13% of actual expenses |
| Apartment purchase (property deduction) | 2,000,000 RUB (for mortgage interest — 3,000,000 RUB) | Up to 260,000 RUB (for interest — up to 390,000 RUB) |
If you pay for education and treatment at the same time, the social deduction is still limited to 120,000 RUB per year. The exception is expensive treatment: it does not count toward the limit.
How Much Money You'll Get Back: Calculation Example
Let's imagine: you work, earn a salary of 60,000 RUB per month, pay 13% NDFL — 7,800 RUB per month, 93,600 RUB per year. During the year you spent 80,000 RUB on treatment and 50,000 RUB on education.
The total amount of social expenses is 130,000 RUB. But the limit is 120,000 RUB. This means the deduction will only be from 120,000 RUB, and 10,000 RUB will "go up in smoke." The refund will be 15,600 RUB.
If you had submitted documents for a property deduction (bought an apartment for 1,800,000 RUB), you could have gotten back 234,000 RUB — but only if your annual NDFL allows it. You paid 93,600 RUB for the year, so you cannot get back more than this amount in one year. The remainder is carried over to subsequent years.
What Documents Are Needed for Each Deduction
Collecting documents is the most routine part. Here's what you'll need.
Education Deduction
- Contract with the educational institution (copy). The institution must have a license — check that it exists.
- Certificate of payment for education (or payment documents: receipts, invoices).
- If you pay for a child — their birth certificate and a certificate confirming full-time enrollment (for children under 24).
- Certificate of your income (from the accounting department or in the personal account of the Federal Tax Service).
- 3-NDFL declaration — you can fill it out in the personal account on the FTS website or through a program.
Treatment Deduction
- Contract for the provision of medical services (copy).
- Certificate of payment for treatment — issued by the clinic. It indicates the service code: 1 — regular treatment (counts toward the limit), 2 — expensive (no limit).
- If you bought medications — doctor's prescription and pharmacy receipts.
- Income certificate and 3-NDFL declaration.
Property Deduction When Buying an Apartment
- Purchase and sale agreement or shared participation agreement.
- Extract from the Unified State Register of Real Estate (EGRN) (confirms ownership).
- Payment documents (receipt, checks, bank statements).
- If mortgage — loan agreement and bank certificate of interest paid.
- Income certificate and 3-NDFL declaration.
How an AI Twin Takes Away the Routine
Collecting documents is only half the battle. Then you need to sort through them, verify amounts, and correctly transfer them into the declaration. This is where the AI twin at asibiont.com helps.
It can search for documents in your email and files: for example, it finds a contract with a clinic or a certificate from the accounting department by keywords. It parses PDFs and scans — extracts amounts, dates, organization names. It cross-checks receipts and certificates: if one amount is in the receipt and another in the certificate, it will show the discrepancy.
It can also calculate the total refund amount taking into account limits and prepare a draft application or a filled-out declaration. But you will still have to submit the documents to the tax office yourself: the AI does not send applications to government agencies without a configured integration and does not certify documents. However, it will remind you of the deadline — for example, that the declaration for the previous year must be submitted by April 30 (if you are required to submit it), and you can apply for a refund within three years.
Where the Mechanism Breaks: Refusal Modes
Even correctly collected documents do not guarantee a refund. Here's what can go wrong.
- The educational institution's license was revoked. You studied, paid, and then the license was annulled. The tax office will refuse. How to notice in advance: check for a license before paying — on the institution's website or in the registry. If it's too late — you can only get the money back through court, and the chances are low.
- The clinic closed and didn't issue a certificate. Without a payment certificate, you cannot get a treatment deduction. So get the certificate immediately after payment, don't delay.
- You bought an apartment from a relative. Transactions between close relatives do not give the right to a property deduction. This is a common situation that people learn about after submitting documents.
- Mortgage interest was paid, but the bank didn't provide a certificate. The bank is obliged to issue a certificate of interest paid, but sometimes delays. Request it in advance, before submitting the declaration.
- You have already used the deduction. The property deduction is given once in a lifetime (since 2014, you can top up the remainder when buying another apartment, but not for everyone). Check whether you have submitted before.
Non-Obvious Conclusion: You Can Get the Deduction Through Your Employer
Many people submit a declaration at the end of the year and wait for a refund for several months. But there is a faster way: get the deduction through your employer. You submit an application to the tax office, the tax office confirms the right to the deduction, and the employer stops withholding NDFL from your salary — you receive more in hand each month.
This is especially convenient for social deductions (education, treatment). It also works for property deductions. The only downside is that you'll have to interact with the accounting department and the tax office, but the money comes faster than after submitting a declaration.
What to Do Right Now
If you paid for education, treatment, or bought an apartment in 2026 — start with something simple: gather all receipts and certificates in one folder. Check whether you have an income certificate. Calculate the approximate refund amount taking into account the limits.
And if you don't want to spend an evening searching for documents and cross-checking numbers — entrust it to the AI twin at asibiont.com. It will find the necessary files in your email, parse the certificates, calculate the amount, and prepare a draft. All you have to do is check and submit.