15-Year vs 30-Year Mortgage: Which Should You Choose?

Published July 23, 2026 · Paired with the Mortgage Calculator

Choosing a mortgage term is really a choice about how to split your money between the bank and your future self. A 15-year loan costs more each month but far less overall; a 30-year loan is easier on the monthly budget but hands the lender a great deal more interest. Neither is universally right. Run both terms through the mortgage calculator with your own numbers as you read, and the trade-off becomes concrete.

The core trade-off

The 30-year loan spreads repayment over twice as many months, so each payment is smaller — often 30–40% lower than the same loan over 15 years. That lower payment is its whole appeal: it is easier to qualify for and easier to live with. But because you owe the balance for twice as long, you pay dramatically more total interest. The 15-year loan flips this: a higher payment you feel every month, in exchange for building equity fast and paying a fraction of the lifetime interest.

Why 15-year rates are usually lower

There is a second, less obvious advantage to the shorter term: lenders typically offer a lower interest rate on 15-year loans. A shorter loan is less risky for the lender — less time for rates, the economy, or your circumstances to move against them — so they price it more cheaply, often a quarter to three-quarters of a percentage point below the 30-year rate. So the 15-year borrower wins twice: fewer years of interest and a lower rate on top.

A worked comparison

Take a $300,000 loan. Over 30 years at 7%, the payment is about $1,996 and you pay roughly $418,000 in interest across the life of the loan — more than the house cost. Over 15 years at, say, 6.5% (reflecting the typical lower rate), the payment jumps to about $2,613, but total interest falls to around $170,000. You pay about $617 more a month, and in return you save on the order of $248,000 in interest and own the home outright in half the time. That is the trade in a single example — plug your own figures into the calculator to see your version.

The case for the 30-year

The lower payment is not just about affordability — it is about flexibility. A 30-year loan frees up cash each month that you could invest, and over long periods a diversified investment might earn more than your mortgage rate, especially if the rate is low. The lower required payment is also a safety buffer: in a tough month, you owe less. And it leaves room to fund retirement accounts, an emergency fund, or a child's education alongside the mortgage. For borrowers with the discipline to invest the difference, the 30-year can be the smarter financial choice, not just the easier one.

The case for the 15-year

The 15-year loan is forced, guaranteed saving. You cannot be tempted to spend the difference because the higher payment is mandatory, and the interest saved is a certain return, unlike an investment that only might beat the rate. You own your home free and clear years sooner — a powerful position heading into retirement — and you are far less exposed if house prices or your income fall. For anyone who values certainty and being debt-free over squeezing out the last bit of investment upside, the 15-year wins.

Let your stage of life weigh in

Beyond the maths, your circumstances should tip the decision. A younger buyer with a long earning runway and competing priorities — building an emergency fund, investing, raising a family — often benefits from the 30-year loan's lower required payment and the flexibility it preserves. Someone closer to retirement, or with a stable high income and few other goals, may prefer the 15-year loan so the mortgage is gone before the paychecks stop. Job security counts too: the more variable your income, the more valuable the 30-year's lower mandatory payment becomes as a cushion for a bad month.

The middle path: buy 30, pay like 15

There is a hybrid that captures much of the best of both. Take the 30-year loan for its low required payment, but voluntarily pay it like a 15-year by adding extra to principal each month. In good months you pay it down aggressively and save the interest; in a hard month you can drop back to the lower required payment without penalty. You give up the 15-year's lower rate, but you keep its fast-payoff benefit while retaining flexibility. Our biweekly payoff calculator shows how even modest extra payments shorten a 30-year loan by years. Whichever you choose, decide based on your own numbers, not a rule of thumb.

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