What your mortgage payment actually covers
The number most buyers obsess over — "what's my monthly payment?" — is deceptively complicated. A mortgage payment is not one number. It's four numbers that your lender bundles together and collects from you in a single monthly ACH, then distributes to four different parties: the bank (principal and interest), your county (property taxes), your insurer (homeowner premium), and, if your down payment was under 20%, a mortgage insurance company (PMI).
This calculator shows all four components so you know what you're actually paying for. The headline number at the top — total monthly payment — is the only number that matters for budgeting. But understanding the breakdown helps you see which pieces are fixed and which can move. Your P&I is locked in for the life of the loan. Taxes and insurance can rise every year. PMI drops off when you hit 20% equity. Knowing the mechanics lets you plan.
How principal and interest work
When you take out a 30-year fixed mortgage, your monthly P&I payment is calculated so that if you pay it every month for exactly 360 months, the loan ends at zero. The math behind it is a standard amortization formula that assumes a fixed interest rate and a constant payment. What changes month to month is the split between principal and interest, not the total.
In the first month of a $360,000 loan at 6.75%, roughly $2,025 of your $2,335 payment goes to interest. Only $310 actually reduces your balance. Ten years in, the split is closer to 50/50. In the final five years, almost every dollar is principal. This front-loading of interest is the single most important fact about mortgages, and the reason why making extra principal payments in the first 5–7 years has such an outsized effect on total interest paid.
If you run the calculator at a 30-year term and then switch to 15 years, you'll see the total interest number drop by roughly 60%. Not because the rate is different, but because the loan is outstanding for half the time. Every month of extra term is a month the bank charges interest on the full balance. Shorter loan = less time accruing interest = dramatically less total cost.
Property taxes: the payment that keeps rising
Property tax is the part of your monthly payment your lender collects on behalf of your county government. It's calculated as a percentage of your home's assessed value, which is set by a local assessor — usually some fraction of market value. National average is around 1.1%, but the spread is enormous. New Jersey homeowners pay ~2.5% of value annually; Hawaii pays under 0.3%.
On a $450,000 home at a 1.1% rate, that's $412 a month just in property tax. On the same home in New Jersey, it's closer to $925 a month. Property tax is the single biggest regional variable in American housing costs, and it's one of the main reasons a $500,000 home in Texas and a $500,000 home in Massachusetts have materially different true costs of ownership. Use our property tax calculatorto see your state's rate and how much it adds to your monthly payment.
Property taxes also rise. Most states reassess every 1–5 years, and local levies shift with school budgets and municipal bonds. If your home appreciates 20%, expect your taxes to rise roughly in line with that over the reassessment cycle. This is a cost most first-time buyers miss. The monthly payment you calculate today is the minimumyou'll ever pay — it only goes up from here.
Homeowner insurance and the Florida problem
Homeowner insurance covers the structure against fire, storm, theft, and liability. Nationally it averages $1,500–2,200 a year on a median-priced home. But if you're in a high-risk state — Florida, Louisiana, California — premiums have been spiking. Florida premiums have roughly tripled since 2020. Some insurers have pulled out of California entirely, leaving homeowners with the state-run insurer of last resort.
When you're running this calculator for a home in a hurricane, wildfire, or tornado zone, assume the quote you'll get is higher than the national average. Call an insurer for a real quote before you fall in love with a specific house — the difference between $1,800/yr and $5,500/yr is $300 a month, which is a full $50,000 off the price you can afford.
PMI — the tax on small down payments
Private mortgage insurance is what lenders charge when your down payment is under 20%. It typically runs 0.4%–1.4% of the loan amount annually, paid in monthly installments. PMI protects the lender, not you, if you default — which is a bitter pill because the borrower pays for it.
The calculator assumes 0.7% PMI when down payment is under 20%, which is a reasonable average. Your actual rate depends on credit score, loan type, and LTV ratio. The good news: PMI isn't forever. Federal law requires your lender to automatically terminate PMI when you reach 78% LTV based on original value. You can request removal earlier at 80%, or even sooner if the home has appreciated — see our PMI calculator for the removal timeline on your specific loan.
HOA fees — the invisible line item
If you're buying in a condo or planned community, HOA fees are a non-negotiable addition to your monthly housing cost. They're not escrowed by your lender — you pay the HOA directly — but they're absolutely part of your total housing burden and lenders count them in your DTI ratio.
HOA fees range from $100/month for basic landscaping-and-trash communities to $1,500+/month for luxury high-rises with concierge and amenities. The national average is around $290. Use our HOA impact calculator to see how a given HOA fee changes the effective price of the home you can afford.
How much home does this payment let you afford?
The reverse question — "what monthly payment does my salary support?" — is answered by DTI (debt-to-income) math. Lenders look at your gross monthly income, multiply by 28% (front-end) or 36–43% (back-end) depending on loan program, subtract your other monthly debts, and that's your maximum housing payment. See our DTI calculator for the exact qualifying math lenders use.
Rough benchmarks at today's ~6.75% 30-year rates with 10% down and typical tax and insurance:
- $75K income: ~$275K home, ~$1,750/mo PITI
- $100K income: ~$365K home, ~$2,335/mo PITI
- $150K income: ~$550K home, ~$3,500/mo PITI
- $200K income: ~$735K home, ~$4,700/mo PITI
- $300K income: ~$1.1M home, ~$7,000/mo PITI
Paying off early: the single best "investment"
Every extra dollar of principal you pay saves you the interest that would have accrued on that dollar for the remaining term. At 6.75%, an extra $200/month on a $360,000 loan shortens the term by 5 years and saves roughly $85,000 in total interest. That's a guaranteed 6.75% return on every dollar, which is hard to beat in a conservative investment portfolio.
The counterargument: if you expect to earn more than your mortgage rate in the stock market (historical average ~10% nominal), investing the extra is better in expectation. But it's not risk-adjusted — the mortgage payoff is guaranteed, the stock return isn't. Most financial planners suggest hybrid: max your tax- advantaged retirement contributions first, then split surplus cash between extra principal and taxable investing.