Calculator
Polish tax-arrears interest calculator
Estimate interest on Polish tax arrears using the applicable entered rate. Data is processed only in your browser, and the page explains the formula and limitations of the result.
Calculator
Enter data
Tax arrears, applicable rate and days in one rate period. Fields marked with an asterisk are required.
How to use the calculator
- Enter the required data: tax arrears, applicable rate and days in one rate period.
- Check the values and select “Calculate”.
- Review the primary result and the detailed calculation components.
Calculation details
Formula and calculation method
Interest = tax arrears × applicable annual rate × days ÷ 365; each rate change is handled as a separate period.
Worked example
For PLN 5,000 of arrears, a 12% rate and 20 days, the estimate before statutory rounding is about PLN 32.88.
Limitations
- The Tax Ordinance contains reduced and increased rates, exclusions, special rules and statutory rounding.
Sources
Engine version: 1.0 · Last reviewed: 3 August 2026
Frequently asked questions
Is the entered data sent to a server?
No. The calculation runs locally in your browser and the values are not saved by default.
Is the result definitive?
Not always. The Tax Ordinance contains reduced and increased rates, exclusions, special rules and statutory rounding.