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Interest calculator — calculate interest amountTable of contents
Tax interest is charged on tax arrears when a tax is paid late. This guide explains when it applies, how to calculate it and how to find the correct rate.
Usually from the day after the payment deadline. Each day of delay increases the amount.
arrears amount × annual rate × number of days / 365
Rates are set by law and can change. If the rate changes during the delay period, calculate separately for each part.
If only part of the amount is paid, interest applies to the remaining balance. Corrections can affect the start date of interest.
Use the tax interest calculator for an indicative result.
In practice, interest arises by law, although authorities may show it in a decision or an arrears notice. The key factors remain the legal deadlines and rates.
If the arrears are large, the period is long or the rate changes, it is safer to verify the calculation with a specialist.
If a taxpayer receives a deferral or installments, the interest calculation may change. Always verify the decision terms.
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