Statutory Interest Calculator

Written byOleh Soloninupdated 5 October 2026

Debt

How to count

First day overdue

Payment day (inclusive)

Leave empty for today.

Result

Interest28,292.47 ₽
Days232
By key rate period
12.01.2026–15.02.2026 35 d 16% / 365 4,602.74 16.02.2026–22.03.2026 35 d 15.5% / 365 4,458.90 23.03.2026–26.04.2026 35 d 15% / 365 4,315.07 27.04.2026–21.06.2026 56 d 14.5% / 365 6,673.97 22.06.2026–26.07.2026 35 d 14.25% / 365 4,099.32 27.07.2026–31.08.2026 36 d 14% / 365 4,142.47
Rate applied6 rate periods
Per day now115.07 ₽
Debt with interest328,292.47 ₽

The fallback when the contract is silent

Interest for the wrongful use of another party's money, calculated at the Bank of Russia key rate over the actual number of days.

Article 395 is the default mechanism. It applies automatically whenever money is withheld without grounds and the contract sets no penalty of its own — a private loan note, a supply contract, a delayed refund all qualify.

Since 2016 the calculation follows a single benchmark, the key rate, rather than the regional deposit averages used before. That change made these claims far easier to compute and to defend.

How to use

Enter the amount owed and choose whether to set the period by dates or as a number of days.
Enter the key rate for the period, or let the calculator apply the rates that were in force between your dates.
Choose the day count basis, 365 or 366, and read the interest, the daily figure and the total.

The statutory floor for late money

Article 395 of the Civil Code sets interest for money withheld without grounds, and it applies whenever a contract says nothing about a penalty. The rate is the central bank key rate for the days in question, applied day by day: on 300,000 at 14 percent that is 115.07 a day, so 120 days come to 13,808.22.

Because the key rate moves, a long delay usually spans several rates. Calculating by dates rather than by a day count lets the calculator apply each rate to its own stretch, which is how a court would do it.

A key rate of 14% throughout, on a 365-day basis. Worked out with this calculator.
Days of delay	Interest on 300,000 ₽	Total due
30	3,452.05 ₽	303,452.05 ₽
120	13,808.22 ₽	313,808.22 ₽
365	42,000.00 ₽	342,000.00 ₽

What this calculator shows

Interest over the period and the cost of a single day
The full claim including the principal
The rate and day count used, so anyone can re-check the arithmetic

What to keep in mind

From dates, the key rate follows each period in which it applied, from 1 January 2023; the number-of-days mode uses one rate throughout.
Each period divides by the days in its own year — 366 in 2024 — and is rounded to the kopeck before adding up.

Where the numbers come from

Checked against Article 395 of the Russian Civil Code; Bank of Russia key rate from cbr.ru · verified September 2026.

FAQs

From what date does interest run?

From the day after payment was due. Where no date was set, the rule for that obligation decides: generally seven days after a demand (article 314(2) of the Civil Code), but a loan with no term is repaid within 30 days of a demand (article 810(1)). Interest runs once the applicable period has passed.

Can I claim both a penalty and statutory interest?

As a general rule, no: where the contract sets a penalty for late payment, that is recovered and article 395 interest is not added on top. A law or the contract itself may provide otherwise (article 395(4) of the Civil Code).

What if the key rate moved?

Calculate each rate period separately and add them. That is how courts check the arithmetic, and a single blended rate invites objections.

Is a pre-claim letter required?

Between businesses, yes, or the claim is left without consideration. Between private individuals it is usually optional but still worth sending.

What does 120 days of delay cost on 300,000?

13,808.22 ₽ at a key rate of 14 percent, which is 115.07 ₽ a day, bringing the total to 313,808.22 ₽.

When does article 395 apply rather than a contractual penalty?

Where the contract is silent about a penalty. Article 395 sets the statutory minimum; where a penalty is agreed, that governs instead, and interest under 395 is generally not charged on top of it.

Worked example

A debt repaid seven and a half months late

Input: 300,000 ₽, 12 January to 31 August 2026

Output: Interest 28,292.47 ₽ over 232 days at six rates

Note: Interest sits on top of the principal and keeps running to the day of actual repayment, not to the day the claim is filed.

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