Amortized Payment Breakdown
Calculator

For each payment in the loan's life, it splits the fixed payment amount into how much reduces the outstanding balance (principal) and how much compensates the lender for the loan (interest), based on the remaining balance at that point.

Interest is charged on the current outstanding balance, which is highest at the start, so early payments are interest-heavy; as the balance shrinks with each payment, less interest accrues and more of each fixed payment goes to principal.

The calculator's schedule typically shows a running total or lets you sum the interest column up to any given payment number, which is useful for estimating total interest paid if you plan to sell or refinance before the loan matures.

An extra principal payment reduces the balance immediately, which lowers the interest charged in all subsequent periods and shifts future payments to have a higher principal share, effectively shortening the loan even though the scheduled payment stays the same.

This is the defining feature of an amortized loan: the total payment is fixed by design, and only the internal split between principal and interest shifts each period as the balance declines, keeping the payment predictable for budgeting.