A mortgage payment is usually one monthly check that covers several costs: principal, interest, property taxes, homeowners insurance, and sometimes PMI (private mortgage insurance). Principal and interest follow an amortization schedule that lenders use for the life of the loan.
Understanding how that split changes over time helps you budget, compare loan offers, and decide whether extra payments or a recast make sense.
Principal and interest
Principal is the loan balance you are paying down. Interest is the lender's charge on the remaining balance. Early in a 30-year loan, most of each payment is interest; later years shift toward principal.
The standard payment formula spreads the loan so each payment is the same amount (for fixed-rate mortgages). Total interest paid depends on rate, term, and whether you prepay.
A $400,000 loan at 6.5% for 30 years has a principal-and-interest payment of about $2,528 — but the first payment allocates roughly $2,167 to interest and only $361 to principal.
Escrow, taxes, and PMI
Many lenders collect property taxes and insurance in an escrow account as part of your monthly bill. That makes the payment higher than principal and interest alone.
PMI applies when your down payment is less than 20%. It protects the lender, not you, and can add $100–$300+ per month depending on loan size and credit. PMI typically drops off once you reach 20% equity.
When comparing homes, use the full payment (PITI + PMI + HOA), not the rate quote alone.
15-year vs. 30-year and rate shopping
Shorter terms mean higher monthly payments but far less total interest. A 15-year mortgage often carries a lower rate than a 30-year, compounding the savings.
Even a 0.25% rate difference on a large loan can mean tens of thousands over the life of the mortgage. Shop multiple lenders and compare APR, not just the rate.
Adjustable-rate mortgages (ARMs) start with lower rates that reset later. They can work for short holds but add uncertainty if you stay past the fixed period.
Paying off faster
Extra principal payments reduce the balance ahead of schedule, which cuts total interest and can shorten the loan by years. Even one extra payment per year makes a noticeable difference on a 30-year loan.
A mortgage recast lets you make a lump-sum principal payment and re-amortize the loan at the same rate, lowering the required monthly payment without refinancing.
Refinancing replaces your loan with a new one — worthwhile when rates drop enough to offset closing costs and you plan to stay long enough to break even.
Calculate your payment
Enter home price, down payment, rate, and term to see monthly principal and interest, total interest, and how the balance declines over time.
Use the mortgage calculator for baseline payments, the mortgage payoff calculator to model extra payments, and the recast calculator if you are considering a lump-sum principal reduction.