How a mortgage works
A home loan has two documents. The promissory note is your promise to repay. The mortgage, or in some states a deed of trust, pledges the home as security and lets the lender record a lien against it, so the lender can take and sell the home if you don’t repay.
You pay part of the price as a down payment and borrow the rest. Each monthly payment covers that month’s interest and repays a little principal, a process called Amortization. On a conventional loan with less than 20% down, the lender will usually require private mortgage insurance, which protects the lender, not you.
Most lenders also collect property taxes and homeowners insurance through an escrow account, so the amount you send each month is larger than principal and interest alone, and it can rise even on a fixed-rate loan when taxes or premiums go up. At closing you pay closing costs, and you can choose to buy discount points, each costing 1% of the loan amount, in exchange for a lower rate. The gap between the home’s value and what you still owe is your home equity.
Types of mortgages
Mortgages differ in three main ways: how the rate behaves, how long you take to repay, and who stands behind the loan.
A fixed-rate mortgage keeps the same interest rate and the same principal-and-interest payment for the whole term. An adjustable-rate mortgage (ARM) starts with a fixed rate for an initial period, often five, seven or ten years, then resets at set intervals to a market index plus a margin, within caps on each change and over the life of the loan. The CFPB reports that 85% to 95% of buyers chose fixed rates between 2008 and 2022.
The term is usually 15 or 30 years. A 15-year loan has a higher payment but typically a lower rate and far less total interest, as the example below shows.
Finally, a loan is either conventional, with no government agency insuring or guaranteeing it, or backed by the FHA, the VA or the USDA. Conventional loans at or under the conforming loan limit can be sold to Fannie Mae and Freddie Mac; larger ones are jumbo loans. The table below compares them.
Mortgage rules and numbers for 2026
A few federal figures shape almost every home loan this year. Loan limits decide whether a loan counts as conforming or jumbo and how large an FHA-insured loan can be. They apply to the amount borrowed, not the price, so a larger down payment can keep a loan under the limit. The rates are weekly national averages from Freddie Mac’s Primary Mortgage Market Survey; your own quote will depend on your credit, down payment, points and loan type.
- Conforming loan limit: $832,750 for a one-unit home in most areas in 2026, up $26,250 from 2025, and up to $1,249,125 in high-cost areas.
- FHA loan limits for 2026: a floor of $541,287 and a ceiling of $1,249,125 for a one-unit home, depending on the county.
- Average rates: 6.95% for a 30-year fixed loan and 6.26% for a 15-year fixed loan in the week of September 17, 2026, up from 6.26% and 5.41% a year earlier.
- Tax: if you itemize, interest on up to $750,000 of home acquisition debt ($375,000 married filing separately) is deductible, a limit the 2025 tax law made permanent; debt taken on before December 16, 2017 keeps the $1 million limit.
How to get a mortgage and what lenders check
Federal ability-to-repay rules require a lender to make a reasonable, good-faith determination that you can repay the loan on its terms. For a general Qualified Mortgage, the lender must consider and verify your income or assets, your debts, and your debt-to-income ratio or residual income, and it must underwrite the payment at the highest rate that could apply in the first five years. A Qualified Mortgage also can’t run longer than 30 years, let the balance grow, allow interest-only payments or, apart from limited exceptions, end in a balloon payment.
Within those rules, lenders set their own standards. Your credit score affects both approval and price, and a larger down payment often earns a better rate. An approval is a ceiling, not a budget: the lender doesn’t see your retirement goals or your child-care costs. The usual path to closing:
- Preapproval: a lender reviews your credit, income and assets and states how much it would likely lend.
- Loan Estimates: apply with more than one lender; each must send a Loan Estimate, on the same standard form, within three business days of your application.
- Rate lock: once you choose, lock the rate so a market move before closing doesn’t change it.
- Underwriting: the lender verifies your documents and usually orders an appraisal.
- Closing Disclosure: you must receive it at least three business days before closing; compare it line by line with the Loan Estimate.
How a mortgage fits a lifetime plan
A mortgage is usually the largest liability on a household balance sheet, and it shapes a long-range plan in three ways. The payment is a fixed cost for decades. Its principal portion moves money from cash into home equity, so it lowers spending money without lowering net worth. And the date of the last payment often decides when a household can afford to stop working.
Retiring with a mortgage means drawing more from savings each year, and if that money comes from pre-tax accounts, the extra withdrawals add to taxable income. Later in life, a reverse mortgage can turn equity into cash for owners 62 and older. Along the way, Refinancing can cut the cost of the loan when rates fall, and comparing lenders by APR rather than rate alone captures their fees.
Illustrative numbers
A $400,000 loan: 30 years vs. 15 years at mid-September 2026 averages
- Principal + interest
- The level loan payment set by the amount borrowed, the rate and the term
- Property tax ÷ 12
- One month of the annual property tax, usually collected into escrow
- Homeowners insurance ÷ 12
- One month of the annual premium, usually collected into escrow
- Mortgage insurance
- PMI on a conventional loan with less than 20% equity, or the insurance premium on an FHA loan
Lenders often call this PITI: principal, interest, taxes and insurance. Principal and interest stay level on a fixed-rate loan; the escrowed parts can change every year.
30-year fixed at 6.95%: monthly principal and interest$2,647.79
30-year fixed: total interest over 360 paymentsAbout $553,200
15-year fixed at 6.26%: monthly principal and interest$3,431.87
15-year fixed: total interest over 180 paymentsAbout $217,700
Extra monthly cost of the 15-year loan$784.08
Interest saved by the 15-year loanAbout $335,500
The 15-year loan costs about 30% more each month but saves roughly $335,500 of interest, because the balance falls faster and the rate is lower. Taxes and insurance come on top of both payments, and the higher payment leaves less room for saving, so the right term depends on the rest of the budget.
At a glance
Common US mortgage types
| Loan type | Backed by | Typical borrower |
|---|---|---|
| Conforming conventional | Private lenders; eligible for purchase by Fannie Mae or Freddie Mac | Most borrowers, up to $832,750 for one unit in most areas in 2026 |
| Jumbo conventional | Private lenders | Borrowers who need more than the conforming limit |
| FHA | Federal Housing Administration insurance | Buyers with low down payments or lower credit scores |
| VA | Department of Veterans Affairs guaranty | Veterans, servicemembers and eligible surviving spouses |
| USDA | US Department of Agriculture | Low- to middle-income buyers in eligible rural areas |
Put it in your plan
Mortgage in MoneyWhatIf
Each home in MoneyWhatIf keeps its mortgage on its own property card, beside its value, property tax and upkeep. A future purchase takes a price, down payment, closing costs and financing, and happens at the start of its year. Payments run through cash flow while value and debt are shown separately. The personal share of mortgage interest enters the itemized-deduction calculation, limited by the $750,000 acquisition-debt ceiling. A sale releases the price less the remaining mortgage, selling costs and modeled tax, and a life milestone can date retirement to the year the mortgage balance reaches $0.
Common questions
Mortgage FAQs
What happens if you can’t make your mortgage payments?
Call your servicer as soon as you expect to fall behind. Late payments bring fees and hurt your credit, but federal servicing rules generally bar a servicer from starting foreclosure until you are more than 120 days behind. Use that time to apply for a repayment plan, forbearance or a loan modification; a complete application received more than 37 days before a scheduled foreclosure sale generally halts the sale while it is decided. Selling first can protect any equity you have.
Is mortgage interest tax deductible in 2026?
Only if you itemize, and itemizing lowers your tax only by the amount your deductions exceed the standard deduction: $32,200 for married couples filing jointly and $16,100 for single filers in 2026. A couple paying $27,671 of first-year interest on the 30-year loan in the example, plus $10,000 of state and local tax, clears that bar by only about $5,500. Interest on a home equity loan or HELOC counts only if the money bought, built or substantially improved the home.
How much house can I afford?
Start from the monthly payment, not the price. A common lender rule of thumb keeps housing costs, including taxes and insurance, near 28% of gross monthly income and all debt payments near 36%, but no federal rule sets those numbers and many loans allow more. On $10,000 a month of gross income, 28% is $2,800 for principal, interest, taxes and insurance. Then test that payment against your own budget, your savings goals and the cash you need for closing costs and repairs.
Should I pay off my mortgage before I retire?
It depends on the loan’s rate, your other savings and how you would fund the payoff. Clearing the loan removes a fixed bill and lowers the income you need in retirement, but money sent to the lender is hard to get back without borrowing, and pulling it from pre-tax accounts can raise that year’s tax. Weigh the guaranteed return of the rate against what the money might earn elsewhere, and keep an emergency fund intact either way.