PITI is an acronym that stands for principal, interest, taxes and insurance. Many lenders will estimate PITI as they are deciding whether a borrower qualifies for a mortgage. PITI stands for principal, interest, taxes, and insurance, and refers to the sum of each of these charges, typically quoted on a monthly basis.

These costs are calculated and compared to the borrower’s monthly gross income when approving a mortgage loan. A borrowers PITI should generally be less than or equal to 28% of their gross monthly income.