Deposit with compounding
Deposit growth with compound interest and top-ups
Interest earned
195 618,17 ₽
over 12 months
Total invested
1 000 000,00 ₽
start 1 000 000,00 ₽ + top-ups
Tax on interest
Interest on deposits is subject to personal income tax. Part of each calendar year’s interest is exempt — the key rate sets how much — and everything above it is taxed on the scale for interest income.
Net of tax
1 192 317,06 ₽
interest after tax 192 317,06 ₽
Tax on interest
3 301,11 ₽
exempt 300 000,00 ₽
Tax year by year
| Year | Interest paid | Key rate | Exempt | Taxable base | Tax |
|---|---|---|---|---|---|
| 2026 | 30 225,00 ₽ | 16% | 160 000,00 ₽ | 0,00 ₽ | 0,00 ₽ |
| 2027 | 165 393,17 ₽ | 14% | 140 000,00 ₽ | 25 393,17 ₽ | 3 301,11 ₽ |
| Total | 195 618,17 ₽ | — | 300 000,00 ₽ | 25 393,17 ₽ | 3 301,11 ₽ |
The exempt amount belongs to the person, not to the deposit: interest from your other deposits in the same year eats into it. Interest is booked in the year the bank pays it, and the deposit is taken to open today; a year still to come uses the latest known key rate.
Key rate — Bank of Russia data, published 27 July 2026
Month by month
12 months| Month | Opening balance | Interest | Balance | Yield |
|---|---|---|---|---|
| 1 | 1 000 000,00 ₽ | +15 000,00 ₽ | 1 015 000,00 ₽ | 1,5% |
| 2 | 1 015 000,00 ₽ | +15 225,00 ₽ | 1 030 225,00 ₽ | 3,0% |
| 3 | 1 030 225,00 ₽ | +15 453,38 ₽ | 1 045 678,38 ₽ | 4,6% |
| 4 | 1 045 678,38 ₽ | +15 685,18 ₽ | 1 061 363,55 ₽ | 6,1% |
| 5 | 1 061 363,55 ₽ | +15 920,45 ₽ | 1 077 284,00 ₽ | 7,7% |
| 6 | 1 077 284,00 ₽ | +16 159,26 ₽ | 1 093 443,26 ₽ | 9,3% |
| 7 | 1 093 443,26 ₽ | +16 401,65 ₽ | 1 109 844,91 ₽ | 11,0% |
| 8 | 1 109 844,91 ₽ | +16 647,67 ₽ | 1 126 492,59 ₽ | 12,7% |
| 9 | 1 126 492,59 ₽ | +16 897,39 ₽ | 1 143 389,98 ₽ | 14,3% |
| 10 | 1 143 389,98 ₽ | +17 150,85 ₽ | 1 160 540,83 ₽ | 16,1% |
| 11 | 1 160 540,83 ₽ | +17 408,11 ₽ | 1 177 948,94 ₽ | 17,8% |
| 12 | 1 177 948,94 ₽ | +17 669,23 ₽ | 1 195 618,17 ₽ | 19,6% |
Empty so far
Empty so far
The comparison appears once both scenarios are saved.
Reference block: the method, a worked example and answers to common questions. It does not affect the calculation above.
How it is calculated
- The projection runs month by month: each month interest accrues on the current balance at the monthly share of the annual rate — balance * rate / 1200. The rate is kept as an exact fraction, not a pre-divided decimal, so no kopecks are lost step by step.
- Compounding decides when accrued interest joins the principal and starts earning itself: monthly, quarterly or yearly. Until the compounding boundary the interest accumulates separately, though the month’s balance already shows it.
- A monthly top-up is added after that month’s interest and starts working from the next month — as in a real deposit, where money paid in late in the month misses that month’s interest.
- The result is the end-of-term amount, the income (all interest accrued) and a month-by-month table: the month’s interest, the top-up and the growing balance. Every figure is rounded to the kopeck once, from the true value.
Worked example
The figures the page opens with: 1 000 000 ₽ for 12 months at 18% per annum, monthly compounding, no top-ups. The first month brings 15 000 ₽ (1 000 000 * 18 / 1200), and from then on interest accrues on the grown balance.
By year end the account holds 1 195 618.17 ₽ — an income of 195 618.17 ₽. Note that this is 19.56% of the money invested at a nominal 18% rate: the difference is compound interest earned by monthly capitalisation.
Frequently asked questions
What is interest compounding?
Joining accrued interest to the deposit’s principal, after which interest is charged on it too. The more frequent the compounding, the higher the effective rate: 18% per annum compounds to 19.56% a year monthly, and to exactly 18% yearly.
How do top-ups change the picture?
Every top-up raises the balance and earns interest from the next month. Regular top-ups over a long term beat a single late contribution of the same total — switch the top-up on in the form and compare the table rows.
Why doesn’t the result match my bank’s offer?
Banks differ in the accrual day (calendar day vs month), the base (365/366 vs 30/360) and the compounding moment. This calculator works monthly with compounding at the chosen cadence — the most common scheme; the binding terms are in your deposit agreement.
Is deposit income taxed?
Yes. Each calendar year exempts 1 000 000 ₽ multiplied by the highest key rate standing on the 1st of a month that year; everything above it is taxed at 13% (15% on the part above 2.4 млн ₽ in a year). The calculator works this out for you — year by year, as the deposit pays the interest — and shows what you keep. Note that the exempt amount belongs to the person rather than to the deposit: interest from your other deposits in the same year eats into it.
How do I tell whether the deposit beats inflation?
Compare the effective yield with expected inflation: the “Inflation” calculator shows what today’s sum will be worth after the same 12 months. A deposit at 18% against 8% inflation preserves and grows purchasing power; with inflation above the rate it only slows the loss.
Monthly or yearly compounding — which is better?
At the same nominal rate, always the more frequent one: interest starts working sooner. Flip the compounding in the form and watch the total change; on 1 000 000 ₽ at 18% over a year the gap exceeds 15 000 ₽.
How do I compare deposits with different terms?
By the effective rate — the year’s income as a percent of the money invested, compounding included. A nominal 18% with monthly compounding beats a nominal 18.5% without it: 19.56% against 18.5%. Enter both offers here and compare the final amounts themselves.