How mortgage payments work

Last updated: 2026-08-14

A mortgage payment starts with the amount borrowed, the interest rate, and the number of payments. On a repayment mortgage, each regular payment covers interest first and then reduces principal with what is left.

The core payment

The principal-and-interest payment comes from the standard amortization formula. A higher rate, larger loan, or shorter term changes the payment because the same balance has to be repaid under different timing and interest assumptions.

The full monthly housing cost

Taxes, insurance, PMI, HOA dues, and other housing costs can sit beside the loan payment. They may be collected with the mortgage, but they do not reduce the loan balance.

Use the calculator

Use the mortgage calculator to estimate a full payment with taxes, insurance, and PMI. Use the mortgage amortization calculator to see the balance schedule.