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amount × (rate / 365) × number of daysExample: 10,000 PLN × (15.75% / 365) × 30 days = 129.45 PLN
Calculate each invoice separately - each has its own due date and its own number of days overdue. The sum of the individual calculations gives the total interest amount.
No - interest is compensatory in nature and falls outside the scope of VAT. You issue an interest note (nota odsetkowa), not a VAT invoice.
From the day after the due date on the invoice. If an invoice due on 15 March was not paid, interest starts accruing from 16 March.
When the debtor is a public entity (e.g. a government office or public hospital), the rate is 13.75% (NBP reference rate 5.75% + 8 pp) instead of the standard 15.75% for private entities.
The calculator applies a single rate for the entire period entered. If the NBP reference rate changed during the overdue period (e.g. the Monetary Policy Council raised or cut rates), split the period into sub-periods corresponding to each rate and run a separate calculation for each. Sum the results to get the exact interest amount reflecting all rate changes.
Statutory interest for late payment (11.75%) applies to consumer relationships and wherever the Commercial Transactions Act does not apply. Commercial transaction interest (15.75%) applies automatically when both contract parties are entrepreneurs or public entities. The 4-percentage-point gap can mean hundreds of zloty on every large invoice. Make sure you select the right rate — an error understates your claim.
Yes, though a slightly lower rate applies: 13.75% (NBP reference rate 5.75% + 8 pp) instead of 15.75% for private debtors. Public entities covered by the Act include state and local government authorities, independent public healthcare facilities, public universities, and government agencies. The flat-rate compensation of EUR 40/70/100 applies in the same way as for private debtors.
EUR 40–100 Compensation Calculator - see how much flat-rate recovery compensation you are owed per invoice.
Statutory interest for late payment is compensation owed to creditors when debtors fail to pay on time.
Terminovo calculates interest automatically with every reminder — no manual work needed. Start free →
| Transaction type | Rate | Basis |
|---|---|---|
| B2B transactions (private debtor) | 15.75% | NBP reference rate 5.75% + 10 pp |
| Public entity debtor | 13.75% | NBP reference rate 5.75% + 8 pp |
| Consumer transactions | 11.75% | NBP reference rate 5.75% + 6 pp |
Rates effective from 1 January 2026. Check for updates after each NBP reference rate change.
You can claim interest together with the principal amount. Send a formal payment demand or generate one automatically. You are also entitled to a flat-rate compensation of EUR 40–100.
An interest note (nota odsetkowa) is an accounting document issued by the creditor to document and claim accrued interest for late payment.
With Terminovo you don't need to issue interest notes manually — the system generates interest calculations with every reminder. Start free →
A commercial transaction under the Polish Act of 8 March 2013 on Counteracting Excessive Delays in Commercial Transactions means any agreement for the paid supply of goods or paid provision of services where both parties are entrepreneurs or public entities. In practice: whenever both the seller and the buyer run a business or are public institutions (government offices, public hospitals, universities), the rules of this Act apply automatically.
The 15.75% rate for commercial transactions is 4 percentage points above the consumer rate (11.75%). This was a deliberate legislative choice: for decades, large companies forced their smaller suppliers to accept extended payment terms, effectively obtaining free financing at the smaller party's expense. The higher interest rate makes withholding payment costly — deterring that practice.
In addition to interest, every commercial transaction automatically entitles the creditor to a flat-rate recovery cost compensation:
| Claim amount | Compensation | Note |
|---|---|---|
| Claim up to PLN 5,000 | EUR 40 | due from the first day of delay |
| Claim PLN 5,000 – 50,000 | EUR 70 | regardless of actual costs incurred |
| Claim above PLN 50,000 | EUR 100 | converted at the NBP rate on the due date |
The compensation arises automatically — you do not need to claim it separately or prove any actual costs. If your actual recovery costs exceeded the flat rate, you may pursue the excess in court.
A complete guide to statutory interest rates and how to calculate them.
Learn moreCalculate the flat-rate recovery cost compensation owed on every B2B invoice.
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Learn moreInterest calculator
Find out how much interest you can charge on overdue invoices, based on the Polish Commercial Transactions Act.
Interest to charge
Calculations based on statutory interest for commercial transactions (Art. 7 of the Act). Current rate: 15.75% annually (NBP reference rate 5.75% + 10 p.p.).
Terminovo tracks your invoices and sends your client the current interest amount before you have to call.