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 buy a home, you sign a mortgage — a legal agreement that lets the lender hold a claim on your house until you pay back the full amount. You don't own the house outright until the loan is paid off. If you stop making payments, the lender can take the house through a process called foreclosure.

The lender (usually a bank or mortgage company) gives you the money upfront. You then repay it over time — typically 15 to 30 years — in monthly installments. Each payment covers part of the original loan amount (called principal) plus interest, which is what the lender charges you for borrowing the money.

A mortgage is different from other debts because it's secured — the lender has a legal right to the asset (your house) if you default. Credit card debt and personal loans are unsecured, meaning the lender has no claim on a specific asset. This is why mortgage interest rates are usually lower than credit card rates: the lender's risk is lower.

Key Takeaways

  • A mortgage is a loan to buy a house where the house itself is collateral — the lender can foreclose if you don't pay.
  • You repay a mortgage over 15 to 30 years in monthly payments that cover both principal (the amount borrowed) and interest (the lender's fee).
  • Mortgage interest rates are typically lower than credit card rates because the lender's risk is reduced by holding a claim on your home.
  • You don't own the house free and clear until the mortgage is fully paid off, even though you live in it and can make improvements.
  • The down payment you make upfront (often 10 to 20 percent of the home's price) reduces the amount you need to borrow.

How the monthly payment breaks down

Every month, your payment goes toward two things: principal and interest. Early in the loan, most of your payment covers interest. As you pay down the principal, more of each payment goes toward reducing what you owe.

If you borrow $300,000 at a 6 percent interest rate over 30 years, your monthly payment (before taxes and insurance) is roughly $1,800. In your first payment, about $1,500 goes to interest and $300 to principal. By year 20, that flips — most of the payment reduces what you owe.

Your actual monthly bill also includes property taxes, homeowners insurance, and possibly mortgage insurance (if your down payment was less than 20 percent). These are often bundled into one payment, sometimes called PITI (Principal, Interest, Taxes, Insurance).

Fixed-rate and adjustable-rate mortgages

A fixed-rate mortgage locks in the same interest rate for the entire loan term. If you get a 6 percent rate, it stays 6 percent whether you're in year 1 or year 29. This makes your monthly payment predictable and protects you if interest rates rise.

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 or decrease. ARMs carry more risk because your payment could jump significantly, but they offer a lower starting rate.

Most first-time homebuyers choose fixed-rate mortgages because the predictability makes budgeting easier. ARMs are sometimes used by buyers who plan to sell or refinance before the rate adjusts.

What happens if you miss payments

Missing one or two mortgage payments damages your credit score and triggers contact from the lender. After 120 days (roughly four months) of missed payments, the lender can begin foreclosure — a legal process to take back the house and sell it to recover what you owe.

Foreclosure is a lengthy process that varies by state. Some states require the lender to go to court; others allow non-judicial foreclosure. The timeline typically ranges from several months to over a year, but the end result is the same: you lose the house and your credit is severely damaged for years.

If you're struggling with payments, contact your lender when ready. Many offer loan modification (changing the terms to lower your payment), forbearance (temporarily pausing payments), or refinancing (replacing the old loan with a new one at better terms). These options are only available if you reach out before you fall behind.

The difference between a mortgage and a home equity loan

A mortgage is the original loan you take out to buy the house. A home equity loan is a separate loan you can take out later, using the equity you've built up (the difference between what the house is worth and what you still owe on the mortgage) as collateral.

For example, if your house is worth $400,000 and you still owe $250,000 on the mortgage, you have $150,000 in equity. You could borrow against that equity for home repairs, debt consolidation, or other expenses. Home equity loans are a second lien on the house, meaning the mortgage lender gets paid first if the house is sold or foreclosed.

Refinancing: replacing your mortgage with a new one

Refinancing means paying off your current mortgage with a new loan, usually to get a lower interest rate, change the loan term, or switch from an ARM to a fixed rate. If interest rates drop, refinancing can lower your monthly payment or let you pay off the house faster.

Refinancing involves closing costs (typically 2 to 5 percent of the loan amount) for appraisals, inspections, and lender fees. You break even on refinancing when the monthly savings exceed the closing costs — this can take several years. If you plan to sell the house soon, refinancing may not make financial sense.

You can refinance with your current lender or shop around. The process is similar to getting the original mortgage: the lender orders an appraisal, verifies your income, and checks your credit.

Understanding mortgage terms and documents

When you get a mortgage, you'll sign several documents. The promissory note is your promise to repay the loan. The mortgage deed (or deed of trust in some states) gives the lender a legal claim on the house. The closing disclosure is a summary of the loan terms, interest rate, monthly payment, and all closing costs — you receive this at least three days before closing.

Your loan estimate is provided early in the process and outlines the estimated interest rate, monthly payment, and costs. Compare this to the closing disclosure to make sure nothing changed unexpectedly.

The amortization schedule is a month-by-month breakdown of how much of each payment goes to principal and interest. Your lender provides this, and it shows exactly when the loan will be paid off if you make on-time payments.

Frequently Asked Questions

What's the difference between a mortgage and a loan?

A mortgage is a specific type of loan used to buy real estate, where the property serves as collateral. Other loans (personal loans, car loans, student loans) may not be secured by an asset, or they're secured by something other than real estate. Mortgages typically have lower interest rates because the lender's risk is lower.

Can I pay off my mortgage early?

Yes. You can make extra payments toward principal without penalty on most mortgages. Some older mortgages have prepayment penalties, so check your documents. Paying extra principal shortens the loan term and saves you thousands in interest, but it doesn't reduce your required monthly payment unless you refinance.

What does it mean if my mortgage is "underwater"?

You're underwater when you owe more on the mortgage than the house is worth. This happens when home values drop or you borrowed too much. You can still live in the house and make payments, but you can't sell it for enough to pay off the loan without bringing cash to closing.

Do I need a down payment to get a mortgage?

Most lenders require a down payment of 3 to 20 percent of the home's purchase price. The larger your down payment, the lower your interest rate and the smaller your monthly payment. If you put down less than 20 percent, you'll pay for mortgage insurance, which protects the lender if you default.

What's the difference between a mortgage broker and a mortgage lender?

A mortgage lender is the bank or company that actually provides the money and owns the loan. A mortgage broker is a middleman who helps you find a lender and handles paperwork but doesn't lend the money themselves. Brokers can shop multiple lenders, but they charge fees for this service.