Loans & Credit
Published on September 26, 2025
PITI is the four parts of a monthly mortgage payment: principal, interest, taxes and insurance. Calculate principal and interest with the standard amortisation formula, then add one twelfth of the annual property tax and one twelfth of the annual homeowners insurance premium. On a $400,000 home with 20% down at 6.5% over 30 years, that is $2,022.62 principal and interest, $366.67 tax and $150.00 insurance, giving PITI of $2,539.28.
Published by PraxisCalc, a Zeta Digilux Labs project
When you're calculating the cost of homeownership, it's easy to focus only on the loan amount and interest rate. However, your total monthly housing payment is actually made up of four distinct components, commonly known by the acronym PITI. Understanding PITI is essential for accurate budgeting.
PITI stands for Principal, Interest, Taxes, and Insurance. Let's look at each part:
This is the portion of your payment that goes directly toward paying down the original amount you borrowed. In the beginning of your loan, the principal portion is small, but it grows larger over the loan's term.
This is the cost you pay to the lender for borrowing the money. The interest portion of your payment is highest at the beginning of the loan and gradually decreases over time.
This refers to the property taxes levied by your local government. Lenders typically collect 1/12th of your estimated annual property tax bill with each monthly mortgage payment and hold it in an escrow account. They then pay the tax bill on your behalf when it's due.
This is your homeowners insurance premium. Similar to property taxes, the lender collects 1/12th of your annual premium each month and pays the bill for you from the escrow account. This protects their investment (and yours) against damage from events like fire or natural disasters.
Don't get caught by surprise. Our Mortgage Calculator lets you input all four components to see your true, complete monthly housing payment.
Use the Mortgage Calculator →Calculating your full PITI payment is crucial because it represents your actual monthly housing expense. A simple principal and interest calculation can be misleadingly low, causing you to underestimate what you can truly afford. Lenders use your PITI to calculate your Debt-to-Income (DTI) ratio when determining your eligibility for a loan.
By understanding and planning for all four components, you can budget effectively and ensure your journey into homeownership is a smooth and sustainable one.
Many buyers estimate affordability from principal and interest alone, but the real monthly cost is usually PITI: principal, interest, taxes, and insurance. PMI, HOA fees, and maintenance can add even more. A mortgage that looks affordable on loan payment alone may feel tight once all housing costs are included.
Use the Mortgage Calculator to estimate a complete payment, then check the broader borrowing limit with the Loan Affordability Calculator.
Private Mortgage Insurance isn't permanent for most conventional loans. Under the federal Homeowners Protection Act, your lender must automatically cancel PMI once your loan balance is scheduled to reach 78% of the home's original value, based on the original amortization schedule, assuming your payments are current. You can also request cancellation earlier, once your balance reaches 80% of the original value, though the lender may require a good payment history and, in some cases, a new appraisal to confirm the home hasn't lost value.
Two common ways to reach 80% faster: pay down principal ahead of schedule (see the Loan Amortization Calculator to see how extra payments shift your balance over time), or benefit from home value appreciation, which some lenders will recognize with a new appraisal. Removing PMI directly reduces your PITI payment, since PMI is the one component that doesn't apply once it's cancelled.
Your lender collects monthly taxes and insurance into an escrow account and pays those bills on your behalf when they come due. Because property tax assessments and insurance premiums both tend to rise over time, it's common for the escrow account to fall short of what's actually owed, this is called an escrow shortage.
When a shortage happens, lenders typically offer two options: pay the shortage as a lump sum, or spread it across the next 12 months as a temporary increase to your monthly payment. Either way, expect your PITI payment to be re-evaluated annually as your escrow account is reconciled, even if your interest rate never changes. Budgeting a small annual buffer for property tax and insurance increases can prevent an escrow shortage from becoming an unpleasant surprise.
The Mortgage Calculator on this page models a fixed-rate loan, where principal and interest stay constant for the life of the loan. An adjustable-rate mortgage (ARM) instead holds the rate fixed for an initial period, commonly 5, 7, or 10 years, and then adjusts periodically based on a market index plus a lender margin, subject to caps on how much the rate can move at each adjustment and over the life of the loan.
ARMs typically start with a lower rate than a comparable fixed-rate loan, which lowers the initial P&I portion of PITI. That makes them worth considering if you expect to sell or refinance before the fixed period ends, but they carry the risk that principal and interest could rise significantly after the adjustment period begins. To compare scenarios, run the calculator at both the ARM's introductory rate and its maximum possible rate after adjustment, so you understand the full range of what your PITI payment could become.
For official guidance on this topic, see the CFPB's home-buying resources.
Work out principal and interest first using M = P x (r(1+r)^n) / ((1+r)^n - 1), where P is the loan amount, r is the annual rate divided by 12 and n is the number of months. Then add the monthly share of property tax and homeowners insurance. The sum of all four is PITI.
Principal, Interest, Taxes and Insurance. Principal reduces the loan balance, interest is the lender's charge, taxes is the monthly portion of your annual property tax bill, and insurance is the monthly portion of your homeowners premium. Lenders use PITI rather than principal and interest alone when deciding what you can borrow.
It is a calculator that returns the full monthly housing payment rather than just principal and interest. Entering the home price, down payment, rate, term, property tax rate and insurance premium produces the figure a lender will actually underwrite against.
The method is identical everywhere, but the tax input differs. California's Proposition 13 caps the base rate at 1% of assessed value with local additions typically bringing the effective rate to around 1.1% to 1.25%, and the assessed value resets to the purchase price when you buy. Use your county's effective rate rather than a national average.
Not in the acronym, but lenders include both when they test affordability. If your down payment is under 20% you will usually pay private mortgage insurance, and homes in an association carry monthly HOA dues. Some lenders describe the full figure as PITIA to make the association fee explicit.
The common front-end guideline is 28% of gross monthly income. On the $2,539.28 payment above, that implies roughly $9,069 a month in gross income, or about $108,800 a year. Lenders also apply a back-end limit covering all debt payments, frequently 36% to 43%.
Advertised payments usually quote principal and interest only, because tax and insurance vary by property. In the example above principal and interest is $2,022.62, while the actual monthly obligation is $2,539.28. The $516.66 gap is the part that catches buyers out.
The principal and interest portion stays fixed on a fixed-rate loan, but taxes and insurance do not. Property reassessments and premium increases raise the escrow portion, so a payment that started at $2,539.28 will drift upward over the life of the loan even when the interest rate never moves.
For faster estimates, open the mortgage calculator and test the numbers with your own assumptions.
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