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

Published July 23, 2026 · Updated October 3, 2026 · 5 min read · By Ramanathan · 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.

Side by side, the two terms differ on more than the payment:

Why are 15-year mortgage rates 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. The shorter term costs more each month but is far cheaper overall, and it usually comes with a lower rate (6.5% here, against 7% on the 30-year):

That is the trade in a single example: about $617 more a month buys roughly $248,000 less interest and a home you own outright in half the time. On the 30-year loan the interest alone ($418,527) is more than the amount borrowed. Plug your own figures into the calculator to see your version.

Payment and interest across loan sizes

The trade-off scales with the loan. Here is the same 7% (30-year) vs 6.5% (15-year) comparison run across a range of loan amounts, so you can find something close to your own number before opening the calculator:

The pattern holds at every size: the 15-year payment runs roughly 30–35% higher, and in exchange the lifetime interest bill falls by close to 60%. What changes is the dollar amount at stake — on a $500,000 loan the 15-year term is worth over $400,000 in saved interest, more than triple the saving on a $200,000 loan for the same percentage-point trade-off.

When should you choose a 30-year mortgage?

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.

When should you choose a 15-year mortgage?

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.

Does “pay it like a 15” actually work?

It mostly does, and it is worth knowing exactly how much it gives up. Take the same $300,000 loan and pay $2,613 a month on the 30-year loan: the 15-year payment from the comparison above.

That is $220,830 saved entirely through voluntary overpayment, with the right to fall back to $1,996 in any month you need to.

But the real 15-year loan, at its lower 6.5% rate, costs only $170,398 in interest. So the hybrid leaves roughly $27,300 on the table against simply taking the 15-year, and finishes a few months later. That gap is the price of the rate discount you never received, and it is the honest answer to a strategy that usually gets described as having no downside.

Whether $27,300 is worth paying for the option to drop back to a lower payment is a question about your income stability, not about arithmetic. If your earnings are steady and predictable, the 15-year is simply cheaper. If they are variable — commission, self-employment, a single income supporting a family — the flexibility is a real product and that is roughly what it costs.

One more option if you are already several years into a 30-year loan: refinancing into a shorter term rather than just paying extra on your existing rate. If rates have moved in your favor since you took the loan, a refinance can combine a lower rate with a shorter term, which the voluntary-overpayment approach above can't do on its own. Run your numbers through the refinance calculator to see whether the closing costs pay for themselves.

Compare terms on your loan:
Mortgage Calculator Biweekly Payoff Calculator Refinance Calculator

Related guides: Fixed-rate vs adjustable-rate mortgage — how to choose · PMI explained — what it costs and how to avoid it

This guide uses US mortgage figures. See the US mortgage calculator & home loan hub for more US-specific calculators and guides.