A mortgage is a loan used specifically to buy real estate, where the property itself serves as collateral. If you stop making payments, the lender has the legal right to foreclose and take ownership of the home to recover its money. For most people, a mortgage is the largest and longest financial commitment they’ll ever make, often spanning 15 to 30 years.
How a Mortgage Works
Instead of paying the full price of a home in cash, you make a down payment (typically 3% to 20% of the purchase price) and borrow the rest from a lender — a bank, credit union, or mortgage company. You then repay that loan over time through monthly payments that include principal, interest, and usually property taxes and insurance.
The Main Parts of a Mortgage Payment
Most monthly mortgage payments are broken into four components, often remembered by the acronym PITI:
- Principal — the portion that pays down your actual loan balance.
- Interest — the cost of borrowing the money, paid to the lender.
- Taxes — property taxes, usually collected monthly and held in escrow.
- Insurance — homeowners insurance, and sometimes mortgage insurance if your down payment is small.
Who’s Involved in a Mortgage
A mortgage transaction typically involves a lender (who provides the funds), a borrower (you), and sometimes a mortgage broker who helps match you with a lender. Other parties like appraisers, title companies, and underwriters also play a role in verifying the property’s value and your ability to repay the loan.
Why Mortgages Exist
Very few people can pay cash for a home, so mortgages make homeownership accessible by spreading the cost over many years. In exchange, lenders charge interest, which is how they earn a profit for taking on the risk of lending such a large sum.
The Bottom Line
Understanding the basics of how a mortgage works is the first step toward becoming a confident homebuyer. In the rest of this guide, we break down every part of the process — from qualifying and choosing a loan type to closing on your new home.