Mortgages — How They Work

Imagine buying a home for $300,000. Now imagine paying almost $600,000 for it. This isn't a scam or a mistake. It's how the single biggest loan of most people's lives works. Understanding the math behind a mortgage doesn't just save you money—it can save you decades of payments.

A mortgage is a loan used to buy a home. The home itself is the collateral, which means if you stop paying, the lender can take the property through a process called foreclosure. Most people don't have enough cash to buy a home outright, so this is how it's done.First, you make a down payment—the cash you pay upfront, usually 5% to 20% of the home's price. The mortgage covers the rest. Here’s the critical part: a $300,000 mortgage at 5% interest for 30 years will have a monthly payment of about $1,610. But over those 30 years, you'll pay a total of roughly $579,600. That's nearly $280,000 in interest alone.This happens because of amortization. In the early years, most of your payment goes to interest. That first $1,610 payment? About $1,250 is pure interest, and only $360 reduces your loan...

Emma, 19, was helping her family look at houses. They found one they loved for $350,000. Emma plugged the numbers into an online calculator with a 5.5% interest rate over 30 years. She stared at the screen. The total cost was over $670,000. It felt like a typo. Her dad explained amortization, showing her how the first several years of payments would barely chip away at the actual loan. Emma, curious, created a spreadsheet. She discovered that by making just one extra payment per year, they could cut almost five years off the loan and save tens of thousands in interest. She realized that the loan terms weren't set in stone if you knew how to work the math.