A mortgage quote is usually advertised as a rate, but a rate isn’t a payment. Four separate charges land in the same monthly debit, only two of them go to your lender, and one of them can be deleted entirely once you understand the rules.
The four parts of a mortgage payment
Lenders call it PITI: principal, interest, taxes, insurance. Principal and interest go to the lender and are fixed for the life of a fixed-rate loan. Taxes and insurance go to your county and your insurer, are collected monthly into an escrow account, and change every year whether you like it or not.
This matters because the payment people budget around is usually just principal and interest — the number a rate calculator produces. In much of the U.S., taxes and insurance add 20% to 35% on top. A household that qualifies comfortably on the P&I figure alone can find the real debit uncomfortably higher.
PMI, and the date it disappears
Put less than 20% down on a conventional loan and the lender adds private mortgage insurance. It protects the lender, not you, and typically runs a few tenths of a percent of the loan per year. The calculator above estimates it at 0.5% annually; your actual rate depends on credit score and down payment.
The useful part is that PMI is temporary and the timing is set by federal law. Under the Homeowners Protection Act, a servicer must automatically cancel PMI on most conventional loans once the balance reaches 78% of the home’s original value, and must honour a written request at 80% if you are current on payments. Extra principal payments pull that date forward — often the highest-return use of a few hundred spare dollars in the early years.
FHA loans work differently: on most modern FHA loans the mortgage insurance premium lasts the life of the loan, and the only exit is refinancing into a conventional mortgage.
Why an extra payment does so much
Interest is charged on the outstanding balance. An extra dollar sent today doesn’t just reduce the balance by a dollar — it cancels every future interest charge that dollar would have generated for the rest of the term. On a 30-year loan that is 360 months of compounding removed by a single payment.
That is why the savings look implausible at first. On a $280,000 loan at 6.5%, an extra $300 a month retires the mortgage roughly nine and a half years early and removes well over $100,000 of interest.
Two practical notes. Tell your servicer in writing to apply extra money to principal; otherwise many will bank it as a prepaid future installment, which does nothing for you. And extra payments shorten the term but do not reduce the required monthly payment — for that you would need a recast, which some servicers offer for a fee.
15-year versus 30-year
A 15-year mortgage carries a lower rate and dramatically less total interest, but the payment is far higher — not half the term for half the cost, but roughly a 45–50% larger monthly obligation.
There is a middle path: take the 30-year loan and voluntarily pay it like a 15-year. You capture most of the interest savings, and in a bad month you can drop back to the required payment without defaulting. The 15-year gives a slightly better rate; the 30-year plus extra payments gives flexibility. Which is worth more depends on how stable your income is.
Escrow drift
Your escrow payment is an estimate of next year’s taxes and insurance divided by twelve. When either rises — and both have risen sharply in many states — your servicer performs an annual escrow analysis, collects the shortfall, and raises the monthly figure. A payment that was comfortable at closing can climb noticeably within a few years while principal and interest never move.
Points and closing costs
A discount point costs 1% of the loan and buys a small permanent rate reduction. The only question is how long the lower payment takes to repay the upfront cost. Divide the point cost by the monthly saving to get the break-even in months; if you expect to sell or refinance before then, points lose.
Compare offers using the Loan Estimate, the standardised three-page form lenders must provide within three business days of your application. Page one carries the APR and payment; page two itemises closing costs; page three shows the five-year total. Every lender uses the same form, which is exactly why comparison works.
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Editorial note. General information and estimates for a U.S. audience — not financial, legal or tax advice. Rates, terms and lender criteria vary by state and change over time. Verify figures with a lender and consider speaking with a licensed professional before taking on debt.