What PITI means and why it matters
PITI stands for Principal, Interest, Taxes, and Insurance — the four parts that make up your monthly mortgage payment. When you borrow money to buy a home, your lender bundles these four costs together into one payment you send each month. Understanding what each piece is helps you see where your money actually goes and predict what your payment will be before you commit to a loan.
Most people focus only on the interest rate when they shop for a mortgage, but PITI shows you the full picture. A lower interest rate matters, but so do property taxes in your county, homeowners insurance costs, and how much principal you're paying down each month. Calculating PITI yourself lets you compare loans fairly and budget for the real cost of homeownership.
Key Takeaways
- PITI has four parts: the principal you borrowed, the interest your lender charges, property taxes your county assesses, and homeowners insurance your lender requires.
- Principal and interest stay the same each month for a fixed-rate mortgage, but taxes and insurance can change year to year.
- You can calculate PITI by hand using the loan amount, interest rate, and loan term, then adding your county's tax rate and your insurance quote.
- Your lender may hold taxes and insurance in an escrow account and pay them on your behalf, so you send one payment that covers all four parts.
- Property tax rates and insurance premiums vary widely by location, so two identical homes in different counties can have very different PITI payments.
Principal and interest: the loan repayment part
Principal is the amount of money you borrowed. Interest is what the lender charges you for lending it. Together, they make up the bulk of most mortgage payments, especially in the early years of the loan.
For a fixed-rate mortgage, the principal and interest payment stays exactly the same every month for the entire loan term — whether that's 15 years, 20 years, or 30 years. Early in the loan, most of your payment goes toward interest. As time passes, more of each payment goes toward principal. By the end of the loan, you're paying mostly principal.
To calculate principal and interest, you need three numbers: the loan amount, the annual interest rate, and the number of months you'll be paying. The formula is:
M = P × [r(1 + r)^n] / [(1 + r)^n − 1]
Where M is your monthly payment, P is the principal (loan amount), r is the monthly interest rate (annual rate divided by 12), and n is the total number of months. If this formula feels abstract, a mortgage calculator does this math for you — you enter the loan amount, rate, and term, and it shows you the monthly principal and interest payment.
For example, a $300,000 loan at 6.5% interest over 30 years (360 months) produces a principal and interest payment of roughly $1,896 per month. That same loan over 15 years (180 months) would be roughly $2,896 per month — higher because you're paying it back faster.
Property taxes: what your county charges
Property tax is a yearly tax your county or municipality charges based on the assessed value of your home. The amount varies dramatically by location — a home worth $400,000 might have annual property taxes of $4,000 in one county and $8,000 in another.
To calculate the property tax portion of PITI, you need to know your county's effective tax rate (the percentage of home value you pay in tax each year) and the assessed value of your home. Many counties assess homes at less than market value, so a $400,000 home might be assessed at $350,000. Check your county assessor's website or your most recent property tax bill to find both numbers.
The calculation is straightforward: multiply the assessed value by the tax rate, then divide by 12 to get the monthly amount. If your home is assessed at $350,000 and your county's tax rate is 1.2% per year, your annual tax is $4,200. Divided by 12 months, that's $350 per month toward PITI.
Property taxes usually increase slightly each year, so your PITI payment will creep up over time. Some states cap the annual increase; others do not. When you're budgeting, assume your property tax portion will rise by 2 to 3 percent annually, though the actual increase depends on your county's policies and your home's assessed value.
Homeowners insurance: protecting the lender's investment
Homeowners insurance protects your home and belongings from damage or loss. Your lender requires you to carry it because the house is collateral for the loan — if it burns down, the lender loses their security. You choose the insurance company and coverage level, but the lender sets a minimum amount you must carry.
Insurance costs depend on your home's age, size, location, construction type, and your claims history. A newer home in a low-crime area with good fire protection costs less to insure than an older home in a remote area. The only way to know your actual cost is to get quotes from insurance companies. Most will quote you over the phone or online in minutes.
Once you have an annual insurance premium, divide it by 12 to get the monthly amount for PITI. If your annual premium is $1,200, that's $100 per month. Unlike property taxes, insurance premiums don't automatically increase each year — they stay the same unless you change your coverage or the insurer raises rates. When you budget, plan for a small increase every few years, but don't assume it will rise annually.
Putting the four parts together
Once you have calculated or found each of the four numbers, adding them is simple:
| Component | Example Amount |
| Principal and Interest | $1,896 |
| Property Tax (monthly) | $350 |
| Homeowners Insurance (monthly) | $100 |
| Total PITI | $2,346 |
In this example, your total monthly PITI payment would be $2,346. This is what you send to your lender each month. Most lenders collect all four parts in a single payment and hold the tax and insurance money in an escrow account — a separate account the lender controls. When property taxes are due, the lender pays them from escrow. When your insurance premium is due, the lender pays it from escrow. You never write separate checks; one payment covers everything.
Your lender will send you an escrow statement once a year showing how much they collected for taxes and insurance, how much they paid out, and what balance remains. If there's a shortfall — if taxes or insurance costs rose more than expected — your lender may increase your monthly payment. If there's a surplus, they may lower it or refund the difference.
What PITI does not include
PITI covers the four largest costs, but homeownership has other expenses that come out of your pocket separately. Mortgage insurance (PMI) is one — if you put down less than 20 percent, your lender requires you to pay insurance that protects them if you default. PMI is sometimes rolled into your monthly payment, sometimes paid separately.
Homeowners association (HOA) fees, if your home is in a community with one, are separate from PITI. Utilities, maintenance, repairs, and improvements are also your responsibility and not part of the PITI calculation. When you budget for homeownership, add these costs on top of PITI to see your true monthly housing expense.
How to use PITI when comparing loans or homes
PITI is most useful when you're deciding between two mortgages or two homes. If you're comparing a 30-year loan at 6.5% to a 15-year loan at 6.0%, calculating the full PITI for each shows you the real monthly cost difference, not just the interest rate difference.
When you're house hunting, calculate PITI for each home you're considering. A home that costs $50,000 less might have higher property taxes in a different county, so the monthly payment difference is smaller than you'd expect. Conversely, a home in a low-tax area might be worth the higher purchase price because your long-term monthly cost is lower.
Keep in mind that property tax assessments can change when you buy a home. Some counties reassess at sale; others reassess on a schedule. Ask your real estate agent or county assessor whether the assessed value will change, because that affects your PITI calculation after closing.
Frequently Asked Questions
Does PITI include PMI or mortgage insurance?
No, PITI does not include PMI. If you put down less than 20 percent, your lender requires mortgage insurance, but it's a separate cost. Some lenders roll PMI into your monthly payment; others bill it separately. Ask your lender to show you the PMI cost separately so you can see the true total.
Can my PITI payment change after I lock in a mortgage rate?
Your principal and interest payment never changes on a fixed-rate mortgage, but property taxes and insurance can. If your county reassesses your home or raises tax rates, your tax portion goes up. If your insurance company raises premiums or you change coverage, your insurance portion goes up. Your lender adjusts your escrow payment to cover these increases.
What if I want to pay property taxes and insurance myself instead of through escrow?
Some lenders allow you to pay taxes and insurance directly to the county and insurance company instead of through escrow, but most require escrow for the first few years or if you put down less than 20 percent. Ask your lender about their escrow policy. Even if you pay separately, you still owe these amounts — escrow just makes sure they get paid on time.
How do I find my county's property tax rate?
Search online for your county assessor's office or visit your county government website. Most assessor offices have a searchable database where you can look up your address and see the assessed value and tax rate. You can also call the assessor's office directly — they answer questions about tax rates regularly.
Should I use a PITI calculator or do it by hand?
A PITI calculator is faster and less error-prone, especially for the principal and interest part, which uses a complex formula. Most mortgage lenders and real estate websites offer free calculators. If you want to understand how the numbers work, doing it by hand once teaches you what each part means — then use a calculator for speed.