What Is PITI?

Ask most people what a mortgage costs and they will quote the loan payment. Ask a lender and you will get a different, larger number — and the lender's number is the one that determines whether you can buy the house. The gap between them is PITI, and misunderstanding it is the most common reason first-time buyers are surprised by their monthly bill.

This guide explains all four components, how escrow works, and why the distinction matters for qualifying. To see the four parts assembled on a specific home price, use the mortgage calculator.

The problem PITI solves

A mortgage payment is not one bill. It is a bundle of obligations arriving on different schedules — a monthly loan payment, a property tax bill once or twice a year, an annual insurance premium — that lenders combine into a single monthly figure.

They do this for two reasons. The first is affordability: what matters is the total cost of holding the home, not the loan in isolation. The second is self-protection, and it is the more interesting one. Unpaid property taxes create a lien that outranks the mortgage. If you stop paying the county, the county can foreclose ahead of the bank. Lenders therefore have a strong interest in collecting the tax themselves rather than trusting you to set the money aside.

The four components

Principal is the portion of each payment that reduces what you owe. Early in the loan it is a small share of the payment; late in the loan it is nearly all of it. The amortization calculator shows that shift month by month.

Interest is the cost of borrowing, charged on the outstanding balance. Because the balance starts at its maximum, the first payments are mostly interest — which is why the balance seems barely to move for the first several years.

Together, principal and interest form the fixed portion of the payment on a fixed-rate loan. They are determined entirely by the loan amount, the rate, and the term.

Taxes means property tax, levied by your county or municipality and typically expressed as a percentage of assessed value. Rates vary enormously across the country — a difference of one percentage point on a $400,000 home is over $300 a month, which can matter more than a rate difference on the loan itself.

Insurance means homeowners insurance, which lenders require because the property is their collateral. Premiums depend on location, construction, claims history, and coverage level, and have risen sharply in some regions.

How escrow works

Rather than trusting borrowers to save for two large annual bills, most lenders collect one-twelfth of the estimated annual amount with each payment and hold it in an escrow account. When the tax bill or insurance premium arrives, the servicer pays it from that account.

At closing you will usually prepay several months of both, to seed the account. These "prepaid items" appear alongside closing costs and catch buyers off guard when they have budgeted only for the down payment.

Once a year the servicer performs an escrow analysis, comparing what was collected against what was actually paid. If taxes or premiums rose more than projected, the account runs short and you face an escrow shortage: either pay the difference as a lump sum or have it spread across next year's payments. This is the single most common reason a fixed-rate mortgage payment changes.

The reverse also happens. If the account holds more than needed, you receive a refund and the monthly escrow portion falls.

A worked example

Consider a $400,000 home with 20% down, leaving a $320,000 loan at 6.5% over 30 years.

Principal and interest work out to roughly $2,023 a month, using the standard amortization formula where the monthly rate is 6.5% ÷ 12 and the term is 360 payments.

Property tax at 1.1% of value is $4,400 a year, or about $367 a month.

Homeowners insurance at $1,500 a year adds $125 a month.

PITI is therefore about $2,515 — roughly 24% more than the loan payment alone. That difference separates a comfortable purchase from a stretched one, and it is why saying "my mortgage is $2,023" understates the real commitment.

Because the down payment reached 20%, no PMI applies. Drop it to 10% and a PMI premium would be added on top, as covered in what is PMI — and the loan itself would be larger, raising principal and interest too.

Why lenders qualify you on PITI

Underwriting uses two debt-to-income ratios.

The front-end ratio compares PITI against gross monthly income, conventionally capped around 28%. The back-end ratio compares all monthly debt payments — PITI plus car loans, student loans, and minimum card payments — against the same income, commonly capped somewhere between 36% and 43% depending on the program.

This has a practical consequence people often miss: paying off other debt increases how much house you can buy. Clearing a $400 car payment frees the entire $400 for housing under the back-end test. The house affordability calculator works backwards through exactly this arithmetic.

It also means a high-tax county reduces your buying power. The same income supports a smaller loan when more of the housing budget is consumed by taxes and insurance.

What PITI leaves out

Four costs sit outside PITI and are frequently forgotten.

HOA dues are paid directly to the association, not through escrow, but lenders count them against your ratios. In a condo they can add hundreds a month.

Maintenance and repairs. A common planning heuristic is 1% to 2% of the home's value annually. It is not a bill you receive, which is precisely why it gets left out of budgets.

Utilities, often higher than in a rental of comparable size.

Closing costs, typically 2% to 5% of the purchase price, due in cash at signing alongside the down payment and prepaid escrow.

Common mistakes

Budgeting on principal and interest. The most frequent error and the source of most payment shock. Always work from the full PITI figure.

Assuming a fixed rate means a fixed payment. The loan portion is fixed; the escrow portion is not, and it generally rises over time.

Using a national average property tax rate. Rates vary by county and sometimes by district within a county. Look up the actual rate for the specific address.

Forgetting prepaid escrow at closing. Several months of taxes and insurance are due upfront, on top of the down payment and closing costs.

Ignoring insurance availability, not just cost. In some regions the question is increasingly whether coverage is obtainable at all, which affects whether the purchase can close.

Treating an escrow refund as a windfall. It usually means the account was overfunded, and next year's analysis may swing the other way.

Practical tips

Get the actual property tax figure from the county assessor or a lender estimate rather than a rule of thumb. It is the component that varies most and it is knowable in advance.

Obtain an insurance quote before you are under contract, particularly in coastal or wildfire-exposed areas where premiums have moved sharply.

Compare the APR rather than the interest rate across lenders, since APR folds in points and lender fees.

Read the annual escrow analysis when it arrives instead of filing it. It explains exactly why your payment is changing and gives you the chance to question an assessment that looks wrong.

If your down payment is close to 20%, check whether crossing that line eliminates PMI — that saving is often larger than a marginal improvement in rate.

Where to go next

Estimate the full monthly cost of a specific home with the mortgage calculator, which builds PITI from the price, down payment, rate, tax, and insurance you enter. Work backwards from your income instead with the house affordability calculator. See how the principal and interest portion splits over time in the amortization calculator, and how extra payments change it in the mortgage payoff calculator.

For the insurance that applies below 20% down, read what is PMI. For how the rate structure itself affects the payment, see fixed vs adjustable rate mortgage. More tools and background sit in the real estate hub.

This guide is educational and does not constitute financial advice. Consult a qualified professional or your lender about your own situation.