How Mortgage Payments Work: Principal, Interest, and Amortization

A typical monthly mortgage payment is made up of four parts often summarized as PITI: principal, interest, taxes, and insurance. The principal reduces what you owe, the interest is the lender's charge for the loan, and taxes and insurance are usually collected into an escrow account.

In the early years of a loan, most of your payment goes toward interest because the outstanding balance is large. As the balance shrinks, more of each payment chips away at the principal.

Amortization is the schedule that maps out exactly how each payment is divided between principal and interest over the life of the loan. Early on, the split is heavily weighted toward interest; later, it flips toward principal.

This front-loading of interest is why making extra principal payments early in a mortgage has an outsized impact. A single extra payment in year one removes that principal from every future interest calculation.

A fixed-rate mortgage keeps the same interest rate for the entire term, giving you predictable payments. An adjustable-rate mortgage starts lower but can rise or fall after an introductory period, introducing uncertainty.

Which is better depends on how long you plan to stay in the home and your tolerance for payment changes. Fixed rates suit long-term owners who value stability.

Paying extra toward principal, switching to biweekly payments, or refinancing to a shorter term can dramatically reduce the total interest you pay. Even small additional amounts add up over a 30-year loan.

Run the numbers with our mortgage and refinance calculators before committing. Seeing the interest savings often makes the case for an aggressive payoff plan.

• Add a fixed extra amount to principal each month
• Make one extra full payment per year
• Refinance to a 15-year term if you can afford it