Mortgage Payment Breakdown: Principal, Interest, Taxes, and Insurance

The payment quote on the table says $3,100 a month. The listing said the house was affordable. Those two numbers disagree because the payment is four lines: principal, interest, taxes, and insurance.

On a $400,000 loan at 6.7% for 30 years, principal and interest run $2,581 a month (Freddie Mac Primary Mortgage Market Survey, mid-2026). Add property tax at about 1.1% of value, homeowners insurance, and sometimes PMI, and the real payment lands near $3,100-3,150. The mortgage payment calculator builds the full number from your price, rate, and down payment.

Principal and interest: the part the rate sets

For a fixed-rate loan, the principal and interest payment never changes across 360 months. What changes is the split. Early payments are mostly interest: on this loan, about $2,233 of the first payment goes to interest and $348 to principal. The split flips only in the final years.

The rate drives the monthly cost more than most buyers expect. At 6.7%, this loan costs $2,581 a month. At 5.7%, the same loan costs about $2,322. At 7.7%, about $2,856. A point of rate is roughly $260 a month on a loan this size.

Rate is also the line you can change later. The refinance break-even calculator shows how many months a lower rate takes to pay for itself.

The term is the second dial. The same $400,000 at the same 6.7% on a 15-year loan costs about $3,530 a month — steeper, but total interest falls from about $529,000 to about $235,000, a saving of roughly $294,000 over the life of the loan. The shorter term trades monthly cash flow for total cost, and it is the quietest way to cut interest without making a single extra payment.

Property taxes: the line the county controls

Property tax is a percentage of assessed value, set by local government. The national average runs about 1.1% of home value a year, and the range by locality is wide. On a $400,000 home, that is about $367 a month.

Assessed value moves independently of your mortgage. A reassessment, a new bond, or a change in local rates changes this line, sometimes by hundreds of dollars a year. Treat the tax estimate in any quote as an estimate, and check the actual rate for the county before you commit.

Insurance: the line you can shop

Lenders require homeowners insurance, and the coverage protects more than the loan. Budget roughly $150-200 a month on a $400,000 home, depending on location, roof age, and the limits you choose.

This is the PITI line you can move the most. Raise the deductible, bundle policies, and compare quotes. The insurance protection tools cover the rest of the stack, and the home contents guide shows what your belongings are actually worth to insure. Bundling auto coverage is where the auto insurance cost guide pays off.

The full PITI picture

PITI is the number lenders underwrite and escrow collects. Some quotes show only principal and interest to make the payment look smaller. Always ask for the full PITI number, because that is the amount that leaves your account each month.

Why escrow collects four bills at once

Escrow is a holding account the lender runs. Each month, one-twelfth of the annual tax and insurance bills is added to the payment, and the lender pays those bills when they come due. The system protects the lender — an unpaid tax lien or a lapsed policy puts the house at risk — and it turns four annual bills into one predictable monthly number.

Escrow balances are reviewed once a year. If taxes rose, the shortfall is spread across the next 12 payments, which is why the escrow line can jump without warning. Budget for the reviewed amount, not the first-year estimate.

When PMI shows up

Private mortgage insurance protects the lender, and the borrower pays for it. With a down payment under 20%, add roughly $150-250 a month on a loan this size. Conventional loans drop PMI automatically once you reach 20% equity; FHA loans have their own premium rules.

The two ways to remove PMI faster are a larger down payment and extra principal payments. The extra payment calculator prices that trade-off.

Loan program matters here. Conventional loans cancel PMI at 20% equity by law, while FHA loans carry mortgage insurance premiums for the life of the loan unless you put 10% or more down. If you bought with a small down payment, refinancing into a conventional loan once equity builds is the usual exit.

Which line moves first

• Rate. Refinancing or buying points lowers principal and interest. This is the biggest lever on a 30-year loan.
• Loan size. A larger down payment shrinks principal and can remove PMI at the same time.
• Taxes. Appeal an assessment you believe is too high. The savings are small monthly and real yearly, and the appeal costs an afternoon.
• Insurance. Shop it every year or two. Premiums drift upward when you are not watching, and the same coverage can cost 20% less at the next carrier.

Bottom line

The mortgage payment is four lines, and each line moves for a different reason. Know the principal and interest at your quoted rate, add the local tax rate, and shop the insurance before you sign. The mortgage payment calculator puts all four lines into one number in about a minute.