How to Estimate Your Full Monthly Mortgage Payment (PITI)

A practical walkthrough for understanding what a lender actually expects you to pay each month: principal, interest, property taxes, home insurance, and — if your down payment is small — PMI. Every example below can be run in the Mortgage Calculator.

The quick version

Lenders quote a monthly mortgage payment as PITI: Principal, Interest, Taxes, and Insurance. Principal and interest pay down the loan itself. Property tax and home insurance are usually collected monthly and held in an escrow account, then paid by the lender when due. If your down payment is below 20% of the home price, lenders typically also require PMI (private mortgage insurance), which protects the lender — not you — if you default.

Example 1: 20% down, no PMI

A $400,000 home with a $80,000 (20%) down payment, a 6.5% annual rate, a 30-year term, $4,400 a year in property tax, and $1,600 a year in home insurance:

  • Home price: 400,000
  • Down payment: 80,000
  • Annual interest rate: 6.5
  • Loan term: 30 years
  • Property tax (annual): 4,400
  • Home insurance (annual): 1,600

The loan amount is $320,000, so principal and interest come to $2,022.62 a month. Adding $366.67 for taxes and $133.33 for insurance brings the total monthly payment to $2,522.62. Because the down payment is exactly 20%, no PMI applies. Over 30 years, total interest paid is $408,142.36.

Example 2: 5% down, PMI applies

Same home and rate, but a much smaller down payment of $20,000 (5%), with a 0.5% annual PMI rate:

  • Home price: 400,000
  • Down payment: 20,000
  • Annual interest rate: 6.5
  • Loan term: 30 years
  • PMI rate (annual): 0.5

The loan amount jumps to $380,000, so principal and interest rise to $2,401.86. Because the down payment is below 20%, PMI kicks in at $158.33 a month. With taxes and insurance, the total monthly payment is $3,060.19 — over $500 more than Example 1, both from the larger loan and from PMI. Based on the standard amortization schedule, this loan reaches 20% equity and PMI could be removed around month 124 (10 years, 4 months in). Total interest over the life of the loan also rises to $484,669.06, since a smaller down payment means a larger, more expensive loan.

Example 3: 15-year term versus 30-year term

Same $400,000 home with a 20% down payment, but a 15-year term instead of 30:

  • Home price: 400,000
  • Down payment: 80,000
  • Annual interest rate: 6.5
  • Loan term: 15 years

Principal and interest rise to $2,787.54 a month — about $765 more than the 30-year payment in Example 1 — but total interest over the life of the loan falls to just $181,757.84, less than half of the 30-year scenario. Property tax and insurance stay the same regardless of term, so the full monthly payment is $3,287.54.

Step-by-step: using the Mortgage Calculator

  1. Open the Mortgage Calculator.
  2. Enter the purchase price in Home price.
  3. Enter how much you're putting down in Down payment.
  4. Enter the loan's stated annual rate in Annual interest rate.
  5. Enter the repayment period in Loan term (years).
  6. Enter your expected Property tax and Home insurance as annual amounts — check a recent tax bill or insurance quote if you have one.
  7. If your down payment is below 20%, enter your lender's PMI rate; otherwise leave it at 0.
  8. Enter any HOA fees as a monthly amount, or 0 if none apply.
  9. Optionally set a Loan start date to see actual payment dates in the schedule.
  10. Select Calculate to see the full PITI breakdown and a downloadable month-by-month or year-by-year amortization schedule.

Common mistakes to avoid

  • Budgeting only for principal and interest.The P&I figure alone can look far more affordable than the real monthly cost once taxes, insurance, PMI, and HOA fees are added.
  • Forgetting that PMI eventually goes away.PMI is generally required only until the loan balance drops to 80% of the original home price — it's an added cost early on, not for the life of the loan.
  • Guessing at property tax and insurance. These vary significantly by location and can change the total monthly payment by hundreds of dollars — use real numbers from a tax bill or insurance quote whenever possible.
  • Comparing homes by list price alone.As Example 2 shows, a smaller down payment increases both the loan amount and the interest rate's effect on it, plus adds PMI — the true cost difference is larger than the price difference alone.

Frequently asked questions

Why do I need PMI if I'm already paying interest?

PMI protects the lender, not you, in case you default while the loan balance is still large relative to the home's value. A down payment of 20% or more is the usual threshold for skipping it entirely.

Can I get PMI removed early?

Once your loan balance reaches 80% of the original home price — through regular payments, extra principal payments, or rising home value — you can typically request that your lender remove PMI.

Do property taxes and insurance ever change?

Yes. Property tax assessments and insurance premiums are typically reviewed annually, and your escrow payment can go up or down as a result — this calculator estimates your payment based on the current annual figures you enter.

Try it yourself: