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Understanding your mortgage payment in 2026

A mortgage payment is more than just principal and interest. The figure our calculator shows you is the full PITI estimate — Principal, Interest, Taxes, and Insurance — which is what your lender will collect from you each month if you have an escrow account. Knowing the PITI total up front is the difference between buying a home you can comfortably afford and stretching to a payment that quietly drains every other line in your budget.

This guide walks through the math behind the calculator, a worked example at a common 2026 price point, the three inputs that move your payment most, and when to use the extra-payment fields.

The mortgage payment formula, in plain English

For the principal-and-interest portion of your payment, the calculator uses the standard amortization formula:

Where M is your monthly P&I payment, P is the loan amount (home price minus down payment), r is your monthly interest rate (annual rate ÷ 12), and n is the total number of monthly payments (loan term in years × 12). This is the same formula every major U.S. lender uses to amortize a fixed-rate mortgage.

We then add your monthly property tax (annual ÷ 12) and monthly homeowner's insurance (annual ÷ 12) on top of P&I to give you the full PITI figure. If your down payment is under 20%, your lender will also charge private mortgage insurance (PMI) until you hit 20% equity — typically $30–$70 per month for every $100,000 borrowed.

Worked example: a $400,000 home in 2026

Let's walk through the default scenario in the calculator — a $400,000 home with 20% down ($80,000), a 30-year fixed loan at 6.85%, $4,800/year in property taxes, and $1,200/year in homeowner's insurance:

• Loan amount: $400,000 − $80,000 = $320,000
• Monthly rate (r): 6.85% ÷ 12 = 0.5708%
• Number of payments (n): 30 × 12 = 360
• Monthly P&I: ~$2,096
• Monthly tax: $4,800 ÷ 12 = $400
• Monthly insurance: $1,200 ÷ 12 = $100
• Total PITI: ~$2,596 per month

Over the full 30-year term, you'd pay roughly $754,000 in P&I — meaning about $434,000 in interest alone, on top of the $320,000 you borrowed. That's why even a small reduction in your rate, term, or loan amount matters so much over time.

The three levers that move your payment most

Many first-time buyers focus on the home price, but in practice three other inputs do more to shape your monthly cost.

1. Interest rate. On a $320,000 loan, dropping from 7.0% to 6.5% lowers your P&I by about $107/month — roughly $38,500 over 30 years. This is why shopping at least three to five lenders, a step the Consumer Financial Protection Bureau actively recommends, can save more than any single negotiation on the home price itself. Use the credit-score slider above to see how each tier maps to a rate estimate.

2. Loan term. Switching from a 30-year to a 15-year mortgage on the same $320,000 loan at 6.5% raises your monthly P&I from about $2,022 to about $2,787 — roughly 38% higher per month. But total interest paid drops from about $407,800 to about $181,700, a $226,000 difference. The 15-year is the right call only if the higher payment fits your budget without forcing trade-offs elsewhere. See our full 15-vs-30 comparison for the decision framework.

3. Down payment. Every additional 5% you put down reduces your loan by 5% of the home price. On a $400,000 home, going from 10% down to 20% down cuts your loan from $360,000 to $320,000, drops your P&I by roughly $263/month at 6.85%, and eliminates PMI entirely — a combined saving that can exceed $350/month. If you're early in the savings stage, our guide on how to save for a down payment walks through six strategies that work in 12–24 months.

Using the credit score slider

Your credit score is one of the largest single factors in the rate a lender will quote you. The slider maps each tier to a representative 30-year fixed-rate estimate based on 2026 market averages:

• Excellent (800+): ~6.10%
• Very good (740–799): ~6.50%
• Good (670–739): ~7.00%
• Fair (580–669): ~7.80%
• Poor (under 580): ~8.90%, often only via FHA or non-prime lenders

These are starting points, not guaranteed quotes. Your actual rate depends on the loan program (conventional, FHA, VA, USDA), the loan-to-value ratio, your debt-to-income ratio, the property type, and the lender's own pricing model. For the deeper view, read what credit score you need to buy a house.

When to use the extra-payment fields

The optional "extra per month" and "extra per year" fields let you model paying down principal faster than required. Even modest extras add up: an extra $200/month on a $320,000 30-year loan at 6.85% pays the mortgage off about 6 years and 2 months early and saves roughly $86,000 in interest. Plug your own numbers in to see the break-even on your loan.

Before doing this in real life, confirm that your lender applies extra payments to principal (not to the next month's payment), and weigh the extra payment against other priorities: building a 3–6 month emergency fund, paying down higher-interest debt, and contributing to a 401(k) up to your employer match. The CFPB's mortgage prepayment guidance is the most current government reference on how prepayments interact with escrow and PMI removal.