What Is PITI? The Four Parts of Your Monthly Mortgage Payment Explained
Principal, Interest, Taxes, and Insurance (PITI) make up your true monthly housing cost. Learn how each component works and how lenders use PITI to size your loan.
Key Takeaways & Executive Summary
- PITI combines Principal, Interest, property Taxes, and Insurance into one monthly figure
- Lenders qualify you against full PITI, not the advertised loan payment
- Taxes and insurance can change annually even on a fixed-rate loan
- Escrow accounts spread large annual bills into predictable monthly amounts
When lenders quote a mortgage payment, the number they advertise is usually just principal and interest. But the payment you actually make every month is PITI — Principal, Interest, Taxes, and Insurance. Understanding each part is the fastest way to know what you can truly afford.
Principal: paying down the loan itself
Principal is the portion of your payment that reduces your loan balance. Early in a 30-year mortgage, principal is a small slice of the payment; by the final years it is most of it. This "amortization" curve is why extra principal payments in the early years have an outsized impact on total interest paid.
Interest: the lender's charge
Interest is the cost of borrowing, calculated on your remaining balance at your note rate. On a fixed-rate loan the rate never changes, but the interest portion of each payment shrinks as your balance falls. On an adjustable-rate mortgage (ARM), the rate itself can reset — which changes the entire payment.
Taxes: the piece that keeps moving
Local property taxes are typically collected by your lender through an escrow account and paid to your municipality on your behalf. Two things catch homeowners off guard:
- Assessments rise over time, so your payment can increase even on a fixed-rate mortgage.
- Tax rates differ dramatically between municipalities — two identical houses across a border can carry very different monthly costs.
Insurance: more than homeowner's coverage
PITI insurance generally includes:
- Homeowner's insurance — required by virtually every lender.
- Flood insurance — required in designated flood zones.
- Mortgage insurance (PMI or MIP) — required on conventional loans with less than 20% down, and on all FHA loans. Unlike the others, PMI can eventually be removed.
Why lenders care about full PITI
Lenders size your loan using a debt-to-income (DTI) ratio measured against full PITI — not the principal-and-interest teaser number. If taxes and insurance push your PITI beyond the allowed DTI, your loan amount is reduced even if the principal payment looked affordable.
The bottom line
Before falling in love with a listing price, model the full PITI at today's tax and insurance rates for that specific property. Our mortgage calculator lets you experiment with principal, rate, and amortization — and our insurance calculator helps you estimate the coverage side of the equation.
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