Current for 2026Last updated: 2026-06-09How we verify data: Methodology →

Tax Interest Calculator

Updated: 9 June 2026

Work out the late payment interest owed to the tax office. Enter the amount of tax arrears and the number of days of delay.

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How we calculate tax interest

Interest = arrears amount x interest rate / 365 x number of days. Base rate 8% (2026).

Interest = 5,000 x 8% / 365 x 60 = 65.75 PLN.

How is tax interest calculated?

Interest = arrears x annual rate / 365 x number of days of delay.

What is the current rate?

The base late payment rate is 8% per year for 2026; verify on podatki.gov.pl.

From which day does delay start?

Delay counts from the day after the statutory payment deadline.

Is there a reduced rate?

A reduced rate can apply for voluntary correction; check the current rules.

Are small amounts due?

Interest below a statutory threshold is not charged; confirm the limit at the tax office.

Is the result binding?

No, it is indicative. The tax office sets the final figure.

Indicative result. The interest rate may change — verify on podatki.gov.pl.

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