How to Calculate Your Full Monthly Mortgage Payment, Including Taxes and Insurance
What Goes Into Your Monthly Mortgage Payment
Your mortgage payment is not just principal and interest. Most lenders bundle four separate costs into one monthly bill: principal (the loan amount you borrowed), interest (what the lender charges), property taxes (paid to your county or municipality), and homeowners insurance (paid to an insurance company). This bundle is called PITI. If you have a mortgage-backed loan, your lender collects all four and distributes them to the right places—but you see one number on your statement.
The principal and interest portions stay the same for the life of a fixed-rate loan. Property taxes and insurance change over time, so your lender recalculates your payment once or twice a year. Understanding how each piece works helps you predict what you will actually owe each month and spot errors on your statement.
Key Takeaways
- Your monthly payment includes principal, interest, property taxes, and homeowners insurance—four separate costs bundled into one bill.
- Property tax rates and amounts vary by county and municipality, so you need your local tax rate and your home's assessed value to estimate taxes.
- Homeowners insurance premiums vary by insurer, home age, location, and coverage level, so you should get quotes from at least two companies.
- Your lender holds property taxes and insurance in an escrow account and pays them on your behalf, then adjusts your monthly payment when either cost changes.
- You can use an online mortgage calculator that includes PITI, or build your own estimate using your loan documents, tax assessor records, and insurance quotes.
How to Find Your Property Tax Amount
Property taxes are calculated by multiplying your home's assessed value by your local tax rate. Both numbers change, and both are public record. Start by visiting your county assessor's website—search "[your county] assessor" or "[your county] property appraiser." Most assessor offices let you search by address and see the assessed value, the tax rate, and the annual tax bill.
The assessed value is not the same as what you paid for the house or what it is worth today. Assessors use their own formula, which varies by state. Some states reassess every year; others reassess every few years or only when the property sells. If you just bought the home, the assessed value may still reflect the previous owner's purchase price until the next assessment cycle.
Once you have the annual property tax amount, divide by 12 to get the monthly portion. For example, if your annual tax is $2,400, your monthly tax payment is $200. This is the number your lender will use to calculate your escrow payment.
How to Estimate Homeowners Insurance
Homeowners insurance protects the lender's investment in the house. Your lender will require you to carry it, and the cost varies widely based on the home's age, location, construction type, your claims history, and the coverage level you choose. There is no public database of insurance rates—you have to get quotes directly from insurers.
Contact at least two insurance companies (State Farm, Allstate, GEICO, and local or regional insurers all write homeowners policies) and ask for a quote. You will need the home's address, year built, square footage, construction type (wood frame, brick, etc.), and the coverage amount you want. Most lenders require coverage equal to the replacement cost of the structure, not the land value. Your real estate agent or the home inspector can help you estimate replacement cost if you are unsure.
Insurance quotes are usually valid for 30 to 60 days. Once you have two or three quotes, use the middle estimate for your mortgage payment calculation. Remember that this is an estimate—your actual premium may be higher or lower, and it will likely increase over time.
Calculating Principal and Interest
Principal and interest are fixed for the life of a fixed-rate loan. You can find both numbers on your loan estimate (the document your lender gave you before closing) or your promissory note. The loan estimate shows the loan amount, interest rate, and loan term (usually 15, 20, or 30 years).
To calculate the monthly payment, you can use an online mortgage calculator—search "mortgage calculator PITI" and enter your loan amount, interest rate, and term. The calculator will show you the principal and interest portion. Do not use a calculator that only shows principal and interest; you need one that includes property taxes and insurance to see your true monthly cost.
If you want to build your own estimate without a calculator, the formula is complex, but many spreadsheet programs (Excel, Google Sheets) have a built-in PMT function that does the math for you. Your lender can also provide an amortization schedule, which shows exactly how much principal and interest you pay each month over the life of the loan.
How Escrow Accounts Work
When you close on a mortgage, your lender sets up an escrow account (also called an impound account). Each month, you pay your lender a total amount that includes principal, interest, property taxes, and insurance. The lender holds the tax and insurance portions in the escrow account and pays the bills on your behalf when they come due.
Your lender estimates how much you will owe in taxes and insurance over the next year, divides by 12, and adds that to your monthly payment. Once a year (usually in the fall or winter), the lender reviews the actual bills paid and recalculates. If taxes or insurance went up, your monthly payment goes up. If they went down, your payment goes down. You will receive a notice of the change before it takes effect.
Some lenders also require an escrow cushion—an extra two months' worth of taxes and insurance held in the account as a buffer. This cushion protects the lender if a bill comes in higher than expected. You do not earn interest on escrow money, so it is not an investment; it is simply a holding account.
Building Your Own PITI Estimate
Once you have gathered the four pieces of information, you can build a simple estimate. Here is the order:
- Principal and interest: Use your loan estimate or an online calculator. Write down the monthly amount.
- Property tax: Find your annual tax on the assessor's website, divide by 12, and write down the monthly amount.
- Homeowners insurance: Get quotes from two or three insurers, pick a middle estimate, divide by 12, and write down the monthly amount.
- Add all four together. This is your estimated total monthly payment.
Keep in mind that this is an estimate. Property taxes can change when the assessor reassesses, and insurance premiums usually increase each year. Your actual payment may be higher or lower than your estimate, especially after the first year.
What Happens If Your Estimate Is Wrong
If your lender's escrow calculation was too high or too low, you will find out during the annual escrow review. If the account has a surplus (the lender paid less than expected), you may receive a refund or a credit toward next year's payment. If there is a shortage (the lender paid more than expected), you will owe the difference, usually spread over the next 12 months as an increase to your payment.
You can also request an escrow analysis at any time if you believe the estimate is significantly off—for example, if your property taxes jumped after a reassessment or your insurance premium doubled. Contact your lender's escrow department and ask them to recalculate based on current bills.
Some states limit how much a lender can charge for an escrow shortage. A few states also allow borrowers to opt out of escrow altogether and pay taxes and insurance directly to the county and insurance company. This is rare and usually only available to borrowers with strong credit and substantial equity in the home. Ask your lender whether this option is available in your state.
Frequently Asked Questions
Can I pay my property taxes and insurance myself instead of through escrow?
In most cases, no—your lender requires escrow as a condition of the loan. A few states and lenders allow borrowers to opt out if they have excellent credit and significant home equity, but this is uncommon. Ask your lender whether you have this option.
Why did my monthly payment go up if I have a fixed-rate loan?
Your principal and interest are fixed, but property taxes and insurance are not. When your lender recalculates escrow, an increase in either taxes or insurance will raise your total payment. You will receive a notice before the change takes effect.
What if I disagree with my property tax assessment?
You can file a formal appeal with your county assessor's office. The process and deadline vary by state, but most assessors allow appeals once a year. Contact your assessor's office for the specific steps and deadline in your county.
How often do property taxes and insurance change?
Property taxes are reassessed on a schedule set by your state—anywhere from every year to every few years. Insurance premiums typically increase annually, though the amount varies by insurer. Your lender reviews escrow once a year and adjusts your payment if needed.
Should I get homeowners insurance quotes before or after making an offer on a house?
You can get quotes anytime, but most people wait until after an offer is accepted. Once you have a signed contract, you know the address and can get accurate quotes. You will need a final quote before closing to confirm the cost for your lender.