Mortgage payment explained: what goes into PITI

When a lender quotes you a monthly mortgage payment, they usually mean the full PITI amount — principal, interest, taxes, and insurance. Each component serves a different purpose, and understanding what you’re actually paying each month helps you compare loan offers accurately and plan your housing budget.

Principal

Principal is the portion of your payment that reduces the outstanding loan balance. In the early years of a 30-year mortgage, principal makes up a relatively small share of each payment — the bulk goes to interest. Over time, that ratio flips. This shift is called amortization: each month, you owe slightly less, so slightly less interest accrues, and slightly more of your fixed payment chips away at the balance.

An amortization schedule shows this breakdown month by month. On a $300,000 loan at 6.5% over 30 years, your first payment might include roughly $675 in principal and $1,625 in interest. By year 20, the same fixed payment includes closer to $1,300 in principal and $1,000 in interest.

Interest

Interest is the lender’s charge for lending you the money. On a fixed-rate mortgage, the rate stays the same for the entire loan term. On an adjustable-rate mortgage (ARM), the rate is fixed for an initial period — commonly 5, 7, or 10 years — then adjusts periodically based on a benchmark index.

Small rate differences compound significantly over time. Research from Freddie Mac found that borrowers who obtained just one additional mortgage quote saved an average of $1,500 over the life of the loan, and those who got five quotes saved an average of $3,000 — underscoring how much lender comparison matters.^[1]

Property taxes

Most lenders require property taxes to be included in your monthly payment and collected in an escrow account, then paid to the local government when due. Property tax rates vary significantly by location. According to the Tax Foundation, effective property tax rates range from around 0.3% in Hawaii to over 2% in New Jersey, with the U.S. median near 1%.^[2] On a $350,000 home in a 1.1% tax area, that adds roughly $320 per month to PITI.

Homeowners insurance

Lenders require homeowners insurance to protect their collateral. Like taxes, premiums are typically collected monthly via escrow. Insurance costs vary widely based on location, home value, coverage level, and risk factors like proximity to flood zones or wildfire areas. In high-risk areas, premiums can run several times the national average — a factor that has meaningfully changed affordability calculations in coastal and fire-prone states in recent years.

Private mortgage insurance (PMI)

If your down payment is less than 20% on a conventional loan, your lender will require private mortgage insurance. PMI protects the lender — not you — if you default. The CFPB reports that PMI typically costs between 0.5% and 1.5% of the original loan amount per year.^[3]On a $300,000 loan, that’s $1,500–$4,500 annually, or $125–$375 added to your monthly payment.

PMI is not permanent on conventional loans. Under the Homeowners Protection Act, lenders must automatically cancel PMI when your loan-to-value ratio reaches 78% based on the original purchase price. You can also request cancellation once you reach 80% LTV, sometimes sooner if home values have risen and you document it with an appraisal.^[4]

FHA loans work differently: most require an upfront mortgage insurance premium (MIP) of 1.75% of the loan amount plus an annual MIP that, for borrowers who put down less than 10%, lasts the life of the loan.^[5]

How to lower your monthly mortgage payment

Several levers affect your total PITI. A larger down payment lowers your principal and can eliminate PMI on conventional loans. A better credit score qualifies you for a lower interest rate. A longer loan term spreads principal over more payments, reducing the monthly amount — though total interest paid increases substantially. Shopping lenders and comparing Loan Estimates can reduce origination fees and may yield a lower rate. And in some cases, paying discount points upfront to buy down the rate makes sense if you plan to stay in the home long enough for the monthly savings to recover the upfront cost.

What the payment calculator shows vs. what you’ll actually pay

A mortgage payment calculator typically computes the principal and interest portion of PITI — the piece determined by the loan amount, rate, and term. Taxes and insurance are estimates that vary by property and location. When budgeting, add realistic tax and insurance estimates on top of the calculator output to get a complete picture of your true monthly housing cost.