Your monthly mortgage payment is rarely just one number ā it's usually a bundle of four separate costs. Understanding each piece makes it far easier to spot where you can save, and why your payment might change over time even on a fixed-rate loan.
The four parts of PITI
Lenders commonly refer to a mortgage payment as PITI: Principal, Interest, Taxes, and Insurance. Each behaves differently over the life of the loan.
- Principal ā the portion that pays down your actual loan balance.
- Interest ā the lender's charge for borrowing, highest in the early years.
- Taxes ā property taxes, often collected monthly via escrow.
- Insurance ā homeowners insurance, and PMI if your down payment is under 20%.
Why your payment can still change
Even with a fixed interest rate, your total payment can rise if your property taxes are reassessed or your insurance premium increases ā both are re-evaluated annually and adjusted in your escrow account.
Knowing this breakdown ahead of time means fewer surprises at closing, and a clearer picture of how extra principal payments actually accelerate your payoff timeline.
PrimeCalculator Editorial Team
Calculator & Finance Writers