How to Calculate a Monthly Mortgage Payment with Taxes and Insurance (PITI)

A $425,000 house with 20% down and a 6.5% mortgage rate gives a principal-and-interest payment of $2,149.03 a month. Yet the amount that actually leaves the borrower’s bank account each month is $2,738.61 — nearly $590 more. The difference is property taxes and homeowners insurance, which the lender collects alongside the loan payment and holds in an escrow account. Lenders call the full monthly amount PITI: Principal, Interest, Taxes, and Insurance. This guide works through the complete calculation with real numbers, shows how each of the four parts is figured, and explains the escrow account that ties them together.

What PITI actually is

PITI is the four-part monthly cost of owning a mortgaged home:

1. Principal (P). The slice of each payment that reduces the loan balance. It starts small and grows over the life of the loan.
2. Interest (I). The lender’s charge for the money, figured on the remaining balance each month. It starts large and shrinks as the balance falls.
3. Taxes (T). Your annual property tax bill, divided by 12 and collected monthly into escrow so the lender can pay the county on time.
4. Insurance (I). Your annual homeowners insurance premium, also divided by 12 and held in escrow so the policy never lapses.

If the down payment is under 20%, a fifth item usually joins the payment: private mortgage insurance (PMI), an extra monthly charge that protects the lender, not the borrower. PITI is the number that matters for budgeting and for the lender’s affordability test — a payment quoted as principal and interest only understates the real monthly cost by hundreds of dollars.

Step 1 — The principal and interest payment

The principal-and-interest portion comes from the standard amortization formula:

M = P × [r(1+r)^n] ÷ [(1+r)^n − 1]

Where P is the loan amount, r is the monthly interest rate (annual rate ÷ 12), and n is the total number of monthly payments. The mortgage calculator runs this formula for any loan amount, rate, and term.

Worked example: a $425,000 home, 20% down, 30-year fixed rate at 6.5%.

• Down payment: 20% × $425,000 = $85,000
• Loan amount (P): $425,000 − $85,000 = $340,000
• Monthly rate (r): 6.5% ÷ 12 = 0.0054167
• Number of payments (n): 30 × 12 = 360

Plugging those in:

• (1 + r)^n = (1.0054167)^360 ≈ 6.991
• M = $340,000 × [0.0054167 × 6.991] ÷ [6.991 − 1] = $2,149.03 per month

That $2,149.03 is principal and interest only. Over the full 30 years the borrower pays $2,149.03 × 360 = $773,651.26, of which $433,651.26 is interest — more than the loan itself. That is the cost of borrowing over three decades, and it is why the rate and the term matter as much as the price of the house. The same formula, with a different rate and term, is what sits behind the mortgage payment formula explained in detail.

Step 2 — Property taxes

Property tax is set by the county or municipality where the home sits, and it is the most variable part of PITI. The bill is the home’s assessed value multiplied by the local tax rate. The median effective property tax rate across the United States is roughly 0.9% to 1.1% of a home’s value per year, but the range is wide: New Jersey and Illinois run above 2%, while Alabama and Hawaii run under 0.4%. Always use the rate for the actual county, not a national average.

Worked example, continued: the $425,000 home sits in a county with a 1.1% effective tax rate.

• Annual property tax: 1.1% × $425,000 = $4,675.00
• Monthly tax collected in escrow: $4,675 ÷ 12 = $389.58

Two things catch new buyers off guard here. First, the tax bill is based on the county’s assessed value, which can be higher than the purchase price if the county reassesses after the sale — a common event, since the sale price itself is evidence of value. Second, tax rates and assessed values both move over time, so the tax portion of PITI rises over the years even though the principal-and-interest portion never changes on a fixed-rate loan.

Step 3 — Homeowners insurance

Lenders require homeowners insurance for as long as the mortgage is outstanding, because the house is the collateral for the loan. The average annual premium for a home in the $400,000 range runs roughly $2,000 to $3,000 a year, depending on the state, the age and construction of the house, the deductible chosen, and the coverage limits. Florida and Gulf Coast premiums run far higher than the national average; a newer home with a high deductible runs lower.

Worked example, continued: the annual premium is $2,400.

• Monthly insurance collected in escrow: $2,400 ÷ 12 = $200.00

The premium is set by the insurer, not the lender, and it is renegotiated every year at renewal. A premium increase shows up as a higher monthly escrow collection, which is the most common reason a fixed-rate mortgage payment still changes from year to year.

Step 4 — Add it up: the full PITI payment

The full monthly payment is $2,738.61 — $589.58 a month above the principal-and-interest figure most rate quotes lead with. For budgeting, $2,738.61 is the real number: it is what the bank drafts every month, and it is the number a lender tests against income when deciding whether the loan is affordable.

When PMI joins the payment

With less than 20% down, the lender adds private mortgage insurance. PMI typically costs 0.3% to 1.5% of the loan amount per year, depending on the down payment size and the borrower’s credit score, and it is billed monthly through the same escrow collection.

Second worked example: a $380,000 home with 10% down, 30-year fixed at 6.75%.

• Down payment: 10% × $380,000 = $38,000
• Loan amount: $380,000 − $38,000 = $342,000
• Principal and interest: $2,218.21 per month
• Property taxes at 1.25%: $4,750 per year = $395.83 per month
• Homeowners insurance: $2,100 per year = $175.00 per month
• PMI at 0.6% of the loan: $2,052 per year = $171.00 per month
• Total monthly payment: $2,218.21 + $395.83 + $175.00 + $171.00 = $2,960.04

The smaller down payment saves $47,000 up front but costs $171 a month in PMI plus a higher rate on a larger loan. The good news: PMI is not permanent. Under the federal Homeowners Protection Act, a borrower can ask the lender to cancel PMI once the loan balance falls to 80% of the home’s original value, and the lender must cancel it automatically at 78%. On a conventional loan that point arrives through regular payments, extra payments, or a higher appraisal after a refinance. (FHA loans work differently — their mortgage insurance premium generally lasts for the life of the loan unless the loan is refinanced into a conventional mortgage.)

How escrow works

The tax and insurance portions are not paid directly to the county or the insurer by the borrower. Each month the lender collects one-twelfth of each annual bill and deposits it in an escrow account. When the property tax bill and the insurance premium come due, the lender pays them out of that account. The borrower sees one monthly draft; behind it, the lender is running a small holding account.

Three escrow facts matter in practice:

• The lender may hold a cushion. Federal rules (RESPA) let the servicer keep up to two months of escrow payments as a cushion against bill increases, so the account is not kept at zero.
• An annual escrow analysis resets the monthly amount. Once a year the servicer reviews what was collected against what was actually paid out. If taxes or insurance rose, the monthly collection goes up — and if the account ran short, the borrower either pays the shortage in a lump sum or spreads it over the next 12 months.
• A surplus comes back. If the account collected more than it paid out, the excess above the allowed cushion is refunded to the borrower.

Escrow is also the reason a “fixed” mortgage payment changes. The principal-and-interest part is genuinely fixed for 30 years, but the tax and insurance parts are re-priced every year, so the total PITI payment drifts up or down with them.

Where the first payment actually goes

The amortization schedule explains why the balance falls so slowly at first. On the $340,000 loan at 6.5%, the first monthly payment of $2,149.03 breaks down as:

• Interest: $340,000 × (6.5% ÷ 12) = $1,841.67
• Principal: $2,149.03 − $1,841.67 = $307.36

In month one, 86% of the payment is interest. By year 10 the split is closer to 60/40, and by the final years almost all of it is principal. The payment never changes; the mix does. Anyone comparing renting with buying should know this: in the early years, most of the mortgage payment is interest — a cost, not equity. The simple interest vs compound interest comparison shows the same time-value mechanics in a simpler setting.

What changes the payment

A shorter term. The same $340,000 at 6.0% over 15 years costs $2,869.11 a month in principal and interest — $720 more per month — but total interest falls from $433,651 to $176,440. The 15-year loan saves about $257,000 in interest and pays the house off in half the time, at the cost of a much larger monthly draft.

Extra principal payments. Adding just $200 a month toward principal on the 30-year, 6.5% example pays the loan off in about 284 months — 23 years and 8 months instead of 30 — and saves roughly $106,500 in interest. Extra payments go straight against the balance, which shrinks every future interest charge. It is the single most powerful lever a borrower has after the rate itself.

The rate. Each half-point of rate moves the payment by roughly $110 a month on a $340,000 loan. That is why a rate buydown or a credit-score improvement before applying can be worth more than negotiating the price down by a few thousand dollars.

Taxes and insurance. A reassessment, a tax-rate increase, or an insurance renewal can each move PITI by $50 to $150 a month with no change at all to the loan. Budget for drift: the payment in year five will almost certainly not equal the payment in year one.

Common mistakes and how to avoid them

Budgeting on principal and interest alone. The quoted payment is not the payment. Add taxes and insurance — and PMI, if applicable — before deciding whether the house is affordable. A common lender test is that total PITI should stay near 28% of gross monthly income, and total debt payments near 36%.

Forgetting that taxes and insurance rise. Property taxes and premiums are re-priced annually. A payment that is comfortable today can become tight in three years if the county reassesses and the insurer raises premiums in the same year.

Paying PMI longer than necessary. Once the balance reaches 80% of the home’s original value, request cancellation in writing — lenders do not always volunteer it. Keep records of extra principal payments and any appraisal that supports a higher home value.

Confusing PITI with total housing cost. PITI leaves out HOA dues, flood insurance where required, utilities, and maintenance. A house with a $300 monthly HOA fee costs $300 more than its PITI suggests.

Using the list price instead of the assessed value for taxes. The tax bill follows the county assessment, which often changes after a sale. Ask the seller for the current tax bill and check the county’s assessment before closing.

How to check your answer

Take a real loan estimate or closing disclosure and reproduce it with the four steps above: run the amortization formula on the loan amount, rate, and term; divide the annual property tax by 12; divide the annual insurance premium by 12; add PMI if the down payment is under 20%. If your computed PITI is within a few dollars of the lender’s figure, the math is right — small differences come from rounding and from the exact day count the servicer uses. If it is off by more, check first whether the loan estimate’s tax figure uses a different assessed value, and then whether the insurance quote is for the same coverage and deductible. The same divide-by-12 escrow logic applies to the EMI calculation for a home loan, which uses the identical amortization formula under a different name.

Frequently asked questions

How do I calculate my monthly mortgage payment with taxes and insurance?

Calculate principal and interest with the amortization formula M = P × [r(1+r)^n] ÷ [(1+r)^n − 1], where P is the loan amount, r is the monthly rate, and n is 360 for a 30-year loan. Then divide the annual property tax by 12 and the annual homeowners insurance premium by 12, and add all three. Add PMI if the down payment is under 20%. On a $425,000 home with 20% down at 6.5%, that works out to $2,149.03 + $389.58 + $200.00 = $2,738.61 a month.

What does PITI stand for?

PITI stands for Principal, Interest, Taxes, and Insurance — the four parts of a monthly mortgage payment. Principal and interest repay the loan; taxes and insurance are collected monthly into an escrow account and paid by the lender when the bills come due. With less than 20% down, PMI (private mortgage insurance) is often added as a fifth monthly charge.

Why is my mortgage payment higher than the principal and interest amount?

Because the lender also collects one-twelfth of the annual property tax bill and one-twelfth of the annual homeowners insurance premium each month. On a $425,000 home those two items add about $590 a month to a $2,149 principal-and-interest payment. The lender holds that money in escrow and pays the county and the insurer on your behalf.

Does my mortgage payment change if I have a fixed rate?

The principal-and-interest portion never changes on a fixed-rate loan, but the total payment can still move. Property taxes and insurance premiums are re-priced every year, and the lender adjusts the monthly escrow collection after its annual escrow analysis. PMI removal also lowers the payment once the loan balance reaches 80% of the home’s original value.

How is PMI calculated and when does it go away?

PMI typically costs 0.3% to 1.5% of the loan amount per year, divided by 12 and added to the monthly payment. On a $342,000 loan at 0.6%, that is $171 a month. A borrower can request cancellation once the loan balance falls to 80% of the home’s original value, and the lender must cancel it automatically at 78%.

Is PITI the same as my total monthly housing cost?

No. PITI covers the loan payment, property taxes, and homeowners insurance. It does not include HOA dues, flood insurance if required, utilities, or maintenance and repairs. When budgeting for a home, add those on top of PITI to get the true monthly cost of ownership.