Your mortgage payment includes more than just principal and interest
When you see a mortgage payment quoted, it often shows only the loan portion — principal and interest. But your actual monthly payment to the lender usually includes property taxes and homeowners insurance too, bundled into what's called PITI (principal, interest, taxes, and insurance). Property taxes vary widely by location and can add $200 to $500 or more per month to your payment. Insurance adds another $100 to $300 monthly on average. Knowing the full number before you commit matters, because it changes whether a house actually fits your budget.
The calculation itself is straightforward once you have the pieces. You'll need your loan amount, interest rate, loan term, the property's assessed value or tax rate for your area, and an insurance quote. A lender can give you all of these during the pre-approval process, or you can estimate them yourself using public records and online tools.
Key Takeaways
- Your full monthly payment includes principal, interest, property taxes, and homeowners insurance — not just the loan amount.
- Property tax rates vary by county and municipality, so you must look up the actual rate for the specific property or neighborhood you're considering.
- You can estimate taxes by finding the property's assessed value and multiplying it by the local tax rate, then dividing by 12 months.
- Insurance estimates come from actual quotes, not calculations — call an agent or get quotes online for the specific house and coverage level you want.
- Lenders calculate PITI during pre-approval and show you the full payment before you commit to a loan.
How to find your property tax amount
Property taxes are set by your county or municipality and are based on the assessed value of the home, not the purchase price. The assessed value is often lower than what you pay for the house. To find the tax rate for a specific property, start with the county assessor's website — search "[your county] assessor" and look for a property search tool. You can usually search by address and see the assessed value and tax rate listed together.
Once you have the assessed value and the tax rate (often shown as a percentage or per $1,000 of value), multiply them together. For example, if a home is assessed at $300,000 and the tax rate is 1.2%, the annual tax is $3,600. Divide by 12 to get the monthly amount: $300 per month. If you're buying a new construction home or the property hasn't been reassessed recently, ask the seller's agent or the county assessor's office what the assessed value is likely to be after purchase — it may change.
Getting an insurance estimate for the calculation
Homeowners insurance is required by lenders and protects the structure of the house and your belongings. The cost depends on the home's age, size, location, construction type, and the coverage level you choose. You cannot calculate this yourself — you need an actual quote from an insurance company. Call a few agents or use online quote tools from major insurers. You'll need the property address, the home's age and square footage, and details about the roof and heating system.
Get quotes for the coverage level you actually want, not the minimum. A basic policy might be $100 per month, but adding higher limits or lower deductibles could bring it to $150 or $200. Use a realistic middle estimate for your calculation. If you're getting a mortgage, the lender will require proof of insurance before closing anyway, so you'll have the exact number before you finalize the loan.
Calculating principal and interest
The principal and interest portion is the largest part of PITI for most homeowners. You need three pieces: the loan amount (the purchase price minus your down payment), the interest rate, and the loan term in years. Most mortgages are 30-year or 15-year loans.
Use an online mortgage calculator — search "mortgage calculator" and enter these three numbers. The calculator will show you the monthly principal and interest payment. For example, a $300,000 loan at 6.5% interest over 30 years comes to roughly $1,896 per month for principal and interest alone. Do not do this math by hand; the formula is complex and calculators are free and accurate.
Putting the full PITI number together
Add the four pieces together: principal and interest, property tax, homeowners insurance, and any mortgage insurance if your down payment is less than 20%. Mortgage insurance (PMI) is an extra cost the lender requires when you put down less than 20%, and it protects the lender if you default. The cost varies but often runs 0.5% to 1% of the loan amount per year, divided by 12 for the monthly payment.
Using the example above: $1,896 (principal and interest) + $300 (property tax) + $150 (insurance) + $125 (PMI, if applicable) = $2,471 per month. This is what you'd actually pay to the lender each month. Lenders typically want your total housing payment to be no more than 28% of your gross monthly income, so if your income is $8,800 per month, a payment around $2,464 would be at the top of what they'll approve.
Why lenders calculate this during pre-approval
When you get pre-approved for a mortgage, the lender runs these numbers for you using the actual property address, current tax records, and insurance quotes they've obtained. They show you the estimated PITI payment as part of the pre-approval letter. This is the most accurate version because it's based on real data, not estimates. If you're shopping for houses before getting pre-approved, use your own calculations to get a ballpark figure and understand what price range makes sense for your budget.
Once you make an offer on a specific house, the lender will refine these numbers. Property taxes might change if the assessed value is different from what you estimated, and insurance quotes may shift based on the actual inspection. The final PITI payment is locked in at closing, and that's what appears on your loan documents.
How taxes and insurance change over time
Your PITI payment is not fixed for the life of the loan. Property taxes typically increase every few years when the county reassesses properties, and insurance premiums rise when insurers adjust rates or you change your coverage. Most lenders put your tax and insurance payments into an escrow account — a separate account they hold — and adjust the monthly payment when taxes or insurance go up. You might see your payment increase by $50 or $100 per month if your county reassesses and raises your tax bill.
Principal and interest stay the same for a fixed-rate mortgage, but taxes and insurance do not. Budget for the possibility that your payment will grow slightly each year. When you're deciding whether you can afford a house, use the current PITI number but keep in mind that the tax and insurance portions may be higher in five years.
Frequently Asked Questions
Does the mortgage calculator include taxes and insurance?
Most basic mortgage calculators show only principal and interest. Look for a "full PITI calculator" or "mortgage payment with taxes and insurance" to get the complete picture. Some calculators let you enter your local tax rate and insurance estimate to show the full payment in one number.
What if I don't know the property tax rate for my area?
Search "[your county] assessor" or "[your county] property appraiser" online — most counties have a public database where you can look up any address and see the tax rate. If you're buying in a new development, ask the builder or real estate agent what the tax rate is for that neighborhood. Tax rates don't vary by individual house, only by location.
Can I get an insurance quote before I make an offer?
Yes. Call insurance agents with the address of the house you're interested in, and they'll give you a quote based on the property details. You don't need to own the house or have it under contract. Getting a quote early helps you understand the true cost before you commit to an offer.
What happens to my PITI payment if I pay off the mortgage early?
If you pay off the loan, principal and interest stop, but you still owe property taxes and homeowners insurance separately — they don't disappear. You'll pay those directly to the county and insurance company instead of through the lender's escrow account. Your total housing costs drop significantly, but taxes and insurance remain.
Is PMI included in the PITI calculation?
PMI is a separate cost that gets added to PITI when your down payment is less than 20%. It's not part of the standard four-part acronym, but lenders include it in your total monthly payment. Once your equity reaches 20% of the home's value, you can request to have PMI removed.