PITI is an acronym that stands for Principal, Interest, Taxes, and Insurance — the four components that make up a standard monthly mortgage payment. Understanding PITI is essential for budgeting because your true monthly housing cost is not just the loan payment — it includes all four elements, and each one can change over time. When a lender evaluates your ability to afford a home, they look at your total PITI payment relative to your income, not just the principal and interest portion.
Principal is the portion of each payment that reduces your loan balance — building your equity in the property. Interest is the cost of borrowing money — what the lender charges you for the use of their funds. Together, principal and interest (P&I) make up the core mortgage payment. For a fixed-rate mortgage, the combined P&I amount never changes. However, the split between principal and interest shifts over time through amortization — early payments are mostly interest, while later payments are mostly principal.
Taxes refers to property taxes levied by local governments. The annual tax bill is divided by 12 and collected each month as part of the mortgage payment, then held in an escrow account until the tax bill is due. Insurance includes homeowners insurance and, if applicable, private mortgage insurance (PMI) or flood insurance. These are also collected monthly and held in escrow. Because tax rates and insurance premiums change annually, the T&I portion of PITI fluctuates — even on a fixed-rate mortgage.
Lenders use PITI to calculate two key affordability ratios. The front-end ratio (housing expense ratio) is your total PITI divided by your gross monthly income — most loan programs require this to be 28% to 31% or less. The back-end ratio (total debt-to-income ratio) adds all monthly debt payments (PITI plus car loans, student loans, credit card minimums) divided by gross income — typically capped at 36% to 43% for conventional loans, though FHA allows up to 50% in some cases.
At closing, the closing disclosure shows your estimated total monthly PITI payment, broken down by component. This helps you budget accurately from day one. Use Beycome's mortgage calculator to estimate your full PITI payment based on your purchase price, down payment, rate, taxes, and insurance. For property tax estimates specific to your area, try the property tax calculator. Get your free closing quote.