How Mortgages Work: A Plain-English Guide
A mortgage is a loan to buy a home, repaid in monthly payments over 15 to 30 years. This guide explains what's in your monthly payment, how interest and amortization work, 15- vs 30-year loans, what lenders look at, down payments and PMI, the steps from preapproval to closing, and what to do if you have trouble paying.
By Pond.com editors Updated 5 min read
Quick answer
- A mortgage is a loan secured by your home; if you don't repay it, the lender can take the home through foreclosure.
- Your monthly payment usually covers principal, interest, property tax and home insurance, plus mortgage insurance if you put down less than 20%.
- In the early years most of each payment goes to interest; that shifts toward principal over time.
- A 15-year loan costs far less interest overall, but the monthly payment is much higher than a 30-year loan's.
- Your credit score, debts, down payment and the lender you choose all affect your rate, so compare at least three lenders.
For most people, a mortgage is the biggest loan they'll ever take on. It's also simpler than it first looks. Once you understand what goes into the monthly payment and how interest works, it's much easier to compare offers and avoid paying more than you need to.
This guide is general information, not financial or legal advice.
The national average rates on the two most common home loans, from Freddie Mac's weekly survey of lenders.
| Loan | Average rate | Week before | Change over a year |
|---|---|---|---|
| 30-year fixed Freddie Mac average Average rate: 7.32% | 7.32% | 7.40% | Up 1.13 points |
| 15-year fixed Freddie Mac average Average rate: 6.68% | 6.68% | 6.71% | Up 1.24 points |
How we chose these
These are the national averages from Freddie Mac's Primary Mortgage Market Survey for the week of October 22, 2026. They aren't offers from any lender. We update them regularly; the table hides itself if it hasn't been updated in a month.
Averages are for borrowers with strong credit and a 20% down payment, and can include points. The rate you're offered depends on your credit, down payment, loan type, location and lender, so compare at least three lenders' Loan Estimates.
For information only, not a recommendation. Rates and terms change often and may depend on where you live; check the details with the provider before you apply. Pond.com isn't paid by any provider listed here.
What a mortgage is
A mortgage is a loan to buy a home, where the home itself is the security for the loan. You agree to repay the amount you borrowed, plus interest, over a set term, usually 15 or 30 years. If you stop paying, the lender can take the home through foreclosure.
Three words you'll see a lot:
- Principal: the amount you borrowed and still owe.
- Interest: what the lender charges you for borrowing, as a yearly percentage rate.
- Term: how long you have to repay the loan.
What's in your monthly payment
Most mortgage payments cover four things, often called PITI:
| Part | What it is |
|---|---|
| Principal | The part that pays down your loan |
| Interest | The lender's charge for the money |
| Taxes | Property tax, usually paid through an escrow account |
| Insurance | Homeowners insurance, usually paid through escrow |
You may also pay mortgage insurance if your down payment is under 20%, and HOA fees if you're in a homeowners association, though HOA dues are usually paid separately. Taxes and insurance can change every year, so your total payment can change even on a fixed-rate loan.
How interest and amortization work
Each month, interest is charged on what you still owe. On a fixed-rate loan, the payment stays the same, but the split changes over time. This is called amortization.
Take a $360,000, 30-year loan at 7.32%:
- Monthly principal and interest: about $2,473.
- First payment: about $2,196 goes to interest and only $277 to principal.
- Total interest over 30 years: about $530,000, if you make every payment as scheduled.
Later payments send more to principal, because each month there's less left to charge interest on. Try your own numbers:
What will your monthly payment be? Include tax, insurance and PMI to see the full amount. Open calculator15-year vs 30-year mortgages
| 30-year fixed | 15-year fixed | |
|---|---|---|
| Example payment on $360,000 | About $2,473 at 7.32% | About $3,172 at 6.68% |
| Total interest | About $530,000 | About $211,000 |
| Rate | Usually higher | Usually lower |
| Best for | Lower, more flexible payments | Paying off faster and saving interest |
Many people choose a 30-year loan for the lower required payment and pay extra when they can. See should you pay off your mortgage early?
Fixed or adjustable rate
A fixed-rate mortgage keeps the same rate for the whole loan. An adjustable-rate mortgage (ARM) starts with a fixed rate for a few years, then changes with the market. Most buyers choose fixed rates for the certainty. See fixed vs adjustable-rate mortgages, and for conventional, FHA, VA and other loans, types of mortgages.
What lenders look at
- Credit score: a higher score usually means a lower rate. See how to raise your credit score.
- Debt-to-income ratio (DTI): your monthly debt payments, including the new mortgage, divided by your gross monthly income. Many lenders prefer 36% or less, and most set a limit of around 43% to 50%.
- Down payment: more down means a smaller loan and often a better rate.
- Income and employment: usually two years of steady history, shown with pay stubs, W-2s or tax returns.
- Savings: enough for the down payment, closing costs and often a few months of payments in reserve.
Down payments and mortgage insurance
You don't need 20% down. Some conventional loans allow 3%, FHA loans 3.5%, and VA and USDA loans can need nothing down. But with less than 20% down on a conventional loan, you'll usually pay private mortgage insurance (PMI), which protects the lender, not you. You can usually remove it later. See how to get rid of PMI and how to save for a down payment.
Rate vs APR
The interest rate is the cost of borrowing the money. The APR (annual percentage rate) adds in certain fees, such as origination charges and points, so it's a better guide to the total cost. When comparing offers, look at both, along with the closing costs. See how to compare mortgage offers and mortgage points explained.
The steps to getting a mortgage
- Check your credit and fix any errors. See how to check your credit report for free.
- Set your budget around a monthly payment you're comfortable with. See how much house can I afford?
- Get preapproved so you know what you can borrow and sellers take your offer seriously.
- Find a home and agree on a price.
- Apply with two or three lenders and compare their Loan Estimates.
- Lock your rate for long enough to close, often 30 to 60 days.
- Underwriting and appraisal: the lender checks your documents and the home's value.
- Review your Closing Disclosure, which you must get at least three business days before closing, and compare it with your Loan Estimate.
- Close: sign the papers, pay your closing costs and get the keys.
Mortgages and taxes
If you itemize deductions, you may be able to deduct interest on up to $750,000 of mortgage debt. Starting with the 2026 tax year, mortgage insurance premiums can be deductible again for households under certain income limits. Most people take the standard deduction instead, so the tax break may be smaller than you expect. See how US income tax works.
If you have trouble paying
Call your loan servicer as soon as you think you'll miss a payment, before you fall behind. Ask about forbearance (a temporary pause or reduction) or a loan modification. A HUD-approved housing counselor can help for free; you can find one through HUD or the Consumer Financial Protection Bureau. Be wary of anyone who charges upfront fees to "save" your home.
Common questions
A common guideline is to keep your total housing payment, including taxes and insurance, at or below about 28% of your gross monthly income, and all your debt payments at or below about 36%. Lenders may approve more, but staying under these levels leaves room for savings and repairs.
An escrow account is held by your loan servicer to pay your property tax and homeowners insurance. Part of each monthly payment goes into it, and the servicer pays the bills when they're due. Your escrow amount is reviewed every year, so your payment can rise if taxes or insurance go up.
Lenders often sell the loan, or the right to collect payments, to another company. Your terms stay the same. You'll get a notice telling you where to send payments, and you have a 60-day grace period if you accidentally pay the old servicer.
It depends on the loan. Many lenders look for at least 620 for a conventional loan, and FHA loans allow scores from 580 with 3.5% down. A higher score usually gets you a lower rate, so even a small improvement before you apply can save money.
Only if you itemize deductions instead of taking the standard deduction. Interest on up to $750,000 of mortgage debt for your main and second home can be deductible. Since the standard deduction is large, many homeowners don't itemize, so check whether it would actually save you money.