Late Payment Interest Calculator

Calculate estimated late-payment interest from principal debt, overdue days, annual rate, and extra fees.

Formula

Simple interest = principal × annual rate × days / 365; compound interest = principal × ((1 + rate / 365)^days − 1).

Source / method note

Uses a 365-day year and offers simple or daily compound interest. The rate is entered by the user.

Legal / official rate note

This is a general estimate; tax, credit-card, rent, and contractual debts are governed by their applicable rules.

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