Result
Monthly payment
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This calculation is for informational purposes only and does not replace advice from a qualified professional. Formulas and rates may not fit your exact situation — double-check the figures before making decisions.
How it is calculated
An annuity payment stays the same for the entire loan term, even though the split inside it keeps changing: early on, most of the payment goes to interest; toward the end, almost all of it goes to principal.
Formula: payment = loan amount × monthly rate × (1 + monthly rate) ^ number of months ÷ ((1 + monthly rate) ^ number of months − 1), where monthly rate = annual rate ÷ 12 ÷ 100.
Total interest = total amount paid − loan amount. Over the full term, annuity payments usually cost more in total interest than a declining-payment ("differentiated") schedule, where the principal is repaid in equal chunks and the payment shrinks over time — but in exchange, the annuity payment is predictable and doesn't front-load a heavier burden in the first months the way a declining schedule does.
The balance chart shows it doesn't decline in a straight line but along an accelerating curve: the first payments barely dent the principal, and most of the paydown happens in the second half of the term.