Calculate your complete monthly mortgage payment — Principal, Interest, Taxes, and Insurance — plus PMI, debt-to-income ratio, affordability analysis, and year-by-year amortization schedule.
When you buy a home with a mortgage, your monthly payment is more than just paying back the loan. PITI — Principal, Interest, Taxes, and Insurance — represents the complete cost of your housing payment. Understanding each component is critical for budgeting, qualifying for a mortgage, and avoiding financial stress as a homeowner.
P — Principal: The portion of your payment that reduces your loan balance. In early years, this is a small fraction; it grows over time as interest decreases. I — Interest: The lender's charge for borrowing money. At 6.75% on a $300,000 loan, year-one interest alone is approximately $20,000. T — Taxes: Property taxes collected monthly and held in an escrow account. The national average is about 1.1% of home value, but ranges from 0.27% (Hawaii) to 2.23% (New Jersey). I — Insurance: Homeowners insurance to protect your property, also escrowed monthly. Average annual cost is $1,900–$2,300 nationally.
Lenders use the 28/36 rule to determine how much you can afford. Your front-end ratio (PITI ÷ gross monthly income) should not exceed 28%. Your back-end ratio (all debt payments ÷ gross monthly income) should not exceed 36%. FHA loans may allow up to 31% front-end and 43% back-end. VA loans may allow up to 41% back-end with no strict front-end limit. Exceeding these thresholds doesn't automatically disqualify you, but it increases risk of loan denial or financial strain.
If your down payment is less than 20%, conventional lenders require Private Mortgage Insurance (PMI). PMI typically costs 0.3%–1.5% of the loan amount annually, depending on credit score and LTV ratio. On a $300,000 loan, PMI ranges from $75–$375/month. PMI can be removed once you reach 20% equity (80% LTV). FHA loans have their own mortgage insurance (MIP) at 0.55%/year for 30-year loans, which lasts the entire loan term unless you refinance. VA loans have no PMI but charge an upfront funding fee.
Interest rate is the single largest variable in your PITI payment. On a $300,000 30-year loan: at 5.0% = $1,610 P&I, at 6.0% = $1,799, at 7.0% = $1,996, at 8.0% = $2,201. Each 1% increase adds approximately $200/month or $72,000 over the loan's life. A 0.25% reduction saves roughly $50/month. Shopping multiple lenders for the best rate is one of the most impactful financial decisions you'll make.
Most lenders require an escrow account for taxes and insurance. Your monthly payment includes the P&I plus 1/12 of annual property taxes and insurance. The lender holds these funds and pays the bills when due. Escrow protects the lender (ensuring taxes and insurance stay current) and helps homeowners budget (avoiding large lump-sum bills). Escrow accounts are re-analyzed annually — your payment may adjust if taxes or insurance rates change.
To reduce your total monthly payment: increase your down payment (lowers loan amount and may eliminate PMI), improve your credit score before applying (qualifies for lower interest rate), choose a longer loan term (lowers monthly payment but increases total interest), appeal your property tax assessment if your home is overvalued, shop homeowners insurance across multiple carriers, and consider paying discount points at closing (1 point = 1% of loan amount, typically reduces rate by 0.25%).