A mortgage is a loan you take out to buy a house, where the house itself serves as security for the lender

When you borrow money to purchase a home, the lender holds a legal claim on that property until you pay back the full amount. This claim is called a mortgage. If you stop making payments, the lender can take the house through a process called foreclosure. The house is what makes the loan possible — without it as collateral, most lenders would not lend the large sums required to buy real estate.

A mortgage is different from other debts because it is secured by a specific asset. A credit card or personal loan is unsecured — the lender has no claim to your belongings if you default. With a mortgage, the lender's right to the property is recorded in public documents at your county or local land records office. This is why buying a house involves title searches, title insurance, and closing documents that can run dozens of pages.

Key Takeaways

  • A mortgage is a loan backed by the house itself, which means the lender can foreclose if you do not pay.
  • You do not own the house outright until the mortgage is fully paid off, even though you live in it and can make repairs.
  • Mortgages typically last 15 to 30 years, and you pay both principal (the borrowed amount) and interest (the lender's fee) each month.
  • The down payment you make at purchase reduces the amount you need to borrow, and it affects your interest rate and whether you pay mortgage insurance.

How the mortgage process works at purchase

When you find a house you want to buy, you make an offer. If the seller accepts, you enter into a purchase agreement. At this point you contact a lender — a bank, credit union, or mortgage company — and request a loan for the purchase price minus your down payment.

The lender orders an appraisal to confirm the house is worth at least what you are paying for it. They also pull your credit report, verify your income, and review your debts to decide whether to lend to you and at what interest rate. This process is called underwriting. Once the lender approves the loan, you move toward closing — the final meeting where you sign all the paperwork, receive the keys, and the lender's money goes to the seller.

At closing, the lender records the mortgage document at the county records office. This public recording tells anyone who searches that the lender has a legal claim on the property. You receive a copy of the mortgage note, which is your promise to repay the loan, and a deed, which shows you are now the owner (though the lender's interest is noted on it).

Principal, interest, and how monthly payments work

Your monthly mortgage payment covers two main things: principal and interest. Principal is the amount of the original loan you borrowed. Interest is what the lender charges you for lending that money — it is their profit. Early in the mortgage, most of your payment goes toward interest. As years pass and you pay down the principal, more of each payment goes toward principal.

If you borrow $300,000 at 6 percent interest over 30 years, your monthly payment (before taxes and insurance) is roughly $1,800. Over those 30 years, you will pay back the $300,000 plus about $215,000 in interest — nearly 72 percent more than you borrowed. This is why the interest rate matters so much. A 1 percent difference in rate can mean tens of thousands of dollars over the life of the loan.

Most lenders require you to also pay property taxes and homeowners insurance as part of your monthly payment. These amounts go into an escrow account held by the lender, who then pays the tax bill and insurance premium on your behalf. This protects the lender's investment — if you do not pay property taxes, the government can place a lien on the house, and if the house burns down uninsured, the lender loses collateral.

Down payments and what they mean for your loan

A down payment is the money you contribute toward the purchase price upfront. If a house costs $400,000 and you put down $80,000, you borrow $320,000. Down payments are usually expressed as a percentage — in this example, 20 percent.

The larger your down payment, the less you borrow, and the lower your monthly payment. A bigger down payment also typically earns you a better interest rate because you are borrowing less relative to the home's value, which means less risk for the lender. If you put down less than 20 percent, most lenders require you to pay private mortgage insurance (PMI), which protects the lender if you default. PMI adds $100 to $300 or more to your monthly payment and does not build equity in your home — it is pure insurance cost.

Down payment requirements vary by lender and loan type. Conventional loans often require 5 to 20 percent down. Federal Housing Administration (FHA) loans allow down payments as low as 3.5 percent. Veterans Affairs (VA) loans and United States Department of Agriculture (USDA) loans may require no down payment at all, though they have other may be able to access rules.

Fixed-rate and adjustable-rate mortgages

A fixed-rate mortgage locks in your interest rate for the entire loan term — 15, 20, or 30 years are most common. Your monthly payment stays the same from the first payment to the last. This predictability makes budgeting easier and protects you if interest rates rise in the future.

An adjustable-rate mortgage (ARM) starts with a lower interest rate that is fixed for a set period — often 3, 5, 7, or 10 years — then adjusts periodically based on market conditions. After the fixed period ends, your rate and payment can increase significantly. ARMs are riskier because your payment could jump hundreds of dollars per month, but they can save money if you plan to sell or refinance before the rate adjusts.

What happens if you stop paying

If you miss mortgage payments, the lender will contact you to collect. After you are typically 120 days behind (four months of payments), the lender can begin foreclosure — a legal process to take back the house and sell it to recover what you owe.

Foreclosure timelines vary by state and whether the lender pursues judicial foreclosure (through the court system) or non-judicial foreclosure (outside court). The process can take several months to over a year. During this time, the missed payments damage your credit score, making it harder and more expensive to borrow in the future. If the house sells for less than you owe, you may still owe the difference, called a deficiency, though some states limit or prohibit deficiency judgments.

Refinancing and paying off your mortgage early

A refinance means taking out a new mortgage to pay off the old one. Homeowners refinance to lower their interest rate, shorten the loan term, switch from an ARM to a fixed rate, or tap into home equity for cash. Refinancing involves closing costs — appraisal, title search, underwriting fees — that typically range from 2 to 5 percent of the loan amount, so it only makes sense if you will stay in the home long enough to recoup those costs through lower payments.

You can also pay off your mortgage early by making extra principal payments or paying a lump sum when you have the money. Some mortgages include a prepayment penalty that charges you a fee for paying off early, though these are less common now. Paying extra principal reduces the total interest you pay and shortens the loan term, but it does not free up your monthly payment — you still owe the full amount each month unless you formally refinance.

Frequently Asked Questions

Do I own my house if I have a mortgage?

Yes, you own the house, but the lender has a legal claim on it until the mortgage is paid off. You can live in it, rent it out, make repairs, and sell it — but you cannot do any of these without the lender's consent if it would affect their security in the property. Once you pay off the mortgage, the lender releases their claim and you own it free and clear.

What is the difference between a mortgage and a deed of trust?

Both are ways to find a home loan, but they work differently legally. In a mortgage, the lender holds a lien on the property. In a deed of trust, a neutral third party (a trustee) holds the title until the loan is paid off. Some states use mortgages, others use deeds of trust. The practical effect is similar — if you do not pay, the lender can foreclose.

Can I get a mortgage if I have bad credit?

It is harder but possible. FHA loans are designed for borrowers with lower credit scores and allow scores as low as 500 with a 10 percent down payment, though 580 or higher typically qualifies for better terms. You will pay a higher interest rate, and you may need a larger down payment or a co-signer. Some lenders specialize in non-traditional credit profiles.

What happens to my mortgage if I inherit the house?

The mortgage stays with the property, not the person. If you inherit a house with a mortgage, you inherit the debt too. You can keep making payments and eventually own it free and clear, refinance it in your name, or sell it and use the proceeds to pay off the loan. The lender cannot force you to pay faster just because ownership changed.

Is mortgage interest tax deductible?

You can deduct mortgage interest on your federal tax return if you itemize deductions and the loan is on a primary or secondary residence. The deduction applies only to interest, not principal or insurance. You must file Form 1040 with Schedule A to claim it. Tax rules change, so consult a tax professional about your specific situation.