# How does a mortgage work?

> You borrow against the home and repay in fixed monthly payments; early ones are mostly interest, later ones mostly principal.

Source: https://www.walletprep.com/learn/how-mortgages-work/ · Updated 2026-10-04 · Housing

A mortgage is a loan to buy a home, repaid in equal monthly payments over a set term, usually 15 or 30 years, with the home as collateral. Early payments go mostly to interest, and the share that pays down the loan grows every month.

## Key facts
- **Payments are fixed, the split is not.** On a fixed-rate loan, principal and interest stay the same every month. Because interest is charged on a shrinking balance, more of each payment goes to principal over time. This is called amortization.
- **The term changes the total cost.** At the same 6.5% rate, a $270,000 loan costs $344,370 in interest over 30 years and $153,358 over 15 years. The 15-year payment is higher: $2,352 versus $1,707.
- **Fixed versus adjustable.** A fixed rate never changes. An adjustable-rate mortgage (ARM) often starts lower, then the rate and payment can rise, sometimes by hundreds of dollars a month.
- **Mortgage insurance can come off.** On a conventional loan with less than 20% down, you can ask to cancel PMI when the balance is scheduled to reach 80% of the home's original value. It must end automatically at 78% if you are current.

## What a mortgage payment covers
The core of the payment is principal, the part that pays back what you borrowed, and interest, the cost of borrowing. Many lenders also collect property tax and homeowners insurance each month and hold it in an escrow account, then pay those bills when they are due. If you put less than 20% down on a conventional loan, mortgage insurance is usually added too.
So a payment quote of principal and interest alone can be hundreds of dollars short of what leaves your account each month.

## Why early payments are mostly interest
Each month, the lender charges interest on the balance you still owe: the balance times the yearly rate divided by 12. The rest of your fixed payment pays down principal.
At the start, the balance is at its largest, so interest takes most of the payment. As the balance falls, interest shrinks and principal grows. On a $270,000 loan at 6.5%, principal is $244 in month 1, about $464 by the end of year 10 and about $888 by the end of year 20.

## Loan terms and rate types
The term is how long you have to repay. Thirty years is common because it keeps the payment lower. Fifteen years costs more each month but much less in total interest, and the rate offered is often lower too.
A fixed-rate mortgage keeps the same principal and interest payment for the whole loan. An adjustable-rate mortgage changes rate after a set period. The CFPB warns that many ARM borrowers underestimate how much their rate can rise, so know your maximum possible payment before you choose one.

## Common types of home loans
Conventional loans are not backed by the government. Some offer down payments as low as 3%, and they usually need private mortgage insurance below 20% down. FHA loans, insured by the Federal Housing Administration, allow 3.5% down. VA loans offer zero down for eligible veterans and service members, and USDA loans offer zero down for eligible buyers in rural areas.
Lower down payment loans usually cost more over time through mortgage insurance or a higher rate. Compare the total cost, not just the cash you need today.

## Getting and comparing offers
After you apply, each lender must send a Loan Estimate within three business days. It shows the rate, the monthly payment, closing costs and features like a prepayment penalty. Ask for estimates from at least three lenders and compare them side by side.
Points are fees you can pay at closing to lower your rate; one point is 1% of the loan. They make sense only if you will keep the loan long enough for the lower payment to repay what you paid up front. Three business days before closing, you get a Closing Disclosure with the final terms.

## A worked example: where Lena's first payment goes
Lena borrows $270,000 for 30 years at a fixed 6.5% rate (an assumed rate; yours will vary). Her principal and interest payment is $1,706.58 a month.

- Loan amount: $270,000
- Rate: 6.5% fixed, 30 years
- Monthly payment: $1,706.58
- Interest, month 1: −$1,462.50
- Principal, month 1: = $244.08
- Paid over 360 months: $614,370
- Amount borrowed: −$270,000
- Total interest: = $344,370

1. Month 1 interest: $270,000 × 6.5% ÷ 12 = $1,462.50. The rest, $1,706.58 − $1,462.50 = $244.08, pays down the balance.
2. Over 360 payments Lena pays about $614,370 in total. Minus the $270,000 she borrowed, that is $344,370 in interest.
3. At the same rate over 15 years, the payment is $2,351.99 and total interest falls to $153,358.

## Common mistakes
- **Taking the first offer.** Rates and fees vary between lenders for the same borrower. Getting several Loan Estimates is the simplest way to save money on a mortgage.
- **Looking only at the payment.** A longer term or an ARM can lower the payment today and cost far more over the life of the loan. Check total interest and the worst-case payment.
- **New credit before closing.** Financing a car or furniture before you close can change your debt-to-income ratio and the loan you get. Wait until after closing.

## Questions people ask
### What is the difference between a 15-year and a 30-year mortgage?
A 15-year loan has a higher payment but costs far less interest and often gets a lower rate. A 30-year loan has a lower payment, which leaves more room in your budget. You can also make extra principal payments on a 30-year loan.

### Can I pay off my mortgage early?
Usually, yes. Extra payments go to principal and cut total interest. Check your Loan Estimate for a prepayment penalty first, since some loans charge one.

### What happens if I miss a mortgage payment?
You will likely owe a late fee, and a payment 30 or more days late can be reported to the credit bureaus. Call your servicer right away and ask about options. A HUD-approved housing counselor can help for little or no cost.

### What is escrow on a mortgage?
An escrow account is set up by your lender to pay property-related bills, like property tax and homeowners insurance. Part of each monthly payment goes into it, and the lender pays those bills for you.

## Do this today
Open the CFPB's Explore Interest Rates tool and enter your state, credit score range and a down payment. Then put that rate into the mortgage calculator to see your payment and how much of it is interest.

## Sources
- [CFPB: Mortgage key terms](https://www.consumerfinance.gov/consumer-tools/mortgages/answers/key-terms/)
- [CFPB: What is a Loan Estimate?](https://www.consumerfinance.gov/ask-cfpb/what-is-a-loan-estimate-en-1995/)
- [CFPB: Closing Disclosure explainer](https://www.consumerfinance.gov/owning-a-home/closing-disclosure/)
- [CFPB: Your home loan toolkit](https://files.consumerfinance.gov/f/documents/cfpb_your-home-loan-toolkit_print_2026-08.pdf)
- [CFPB: When can I remove private mortgage insurance (PMI) from my loan?](https://www.consumerfinance.gov/ask-cfpb/when-can-i-remove-private-mortgage-insurance-pmi-from-my-loan-en-202/)
- [HUD: Loans (FHA and housing counselors)](https://www.hud.gov/helping-americans/loans)

_General education, not personalized financial, tax or legal advice. Figures are examples. Check current rates and limits before you act._