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

When you take out a mortgage, one of the biggest decisions is the loan term — and for most buyers it comes down to 15 years versus 30 years. The choice has a huge impact on both your monthly payment and the total cost of your home, sometimes to the tune of a hundred thousand dollars or more in interest. Neither is universally “better”; the right answer depends on your finances and priorities. Here’s how to think it through.

The core trade-off

A 30-year mortgage spreads payments over a longer period, so each monthly payment is lower and more affordable — but you pay interest for twice as long, so the total interest is far higher. A 15-year mortgage has higher monthly payments because you’re paying off the same amount in half the time, but you pay dramatically less interest overall, and you own your home outright much sooner. Fifteen-year loans also usually carry a slightly lower interest rate, amplifying the savings.

See the numbers

Consider a $300,000 loan. At 6.5% over 30 years, the payment is about $1,896 and you’d pay roughly $383,000 in interest. At a 15-year term and a slightly lower rate, the payment jumps to around $2,600 — but total interest falls to roughly $170,000. That’s over $200,000 saved, in exchange for about $700 more each month. Plug your own figures into the mortgage calculator (set the term to 15 or 30) to see your exact trade-off.

When a 30-year makes sense

The longer term suits you if the lower payment is what makes the home affordable, if you value cash-flow flexibility, or if you’d rather invest the monthly difference. Because mortgage rates are often lower than long-term investment returns, some people deliberately choose the 30-year and invest the savings, potentially coming out ahead. The 30-year also gives you a safety buffer: a lower required payment is easier to cover if your income dips.

When a 15-year makes sense

The shorter term suits you if you can comfortably afford the higher payment, want to save enormously on interest, and like the idea of being mortgage-free sooner — especially if that aligns with goals like retirement. It enforces a kind of disciplined saving (forced equity), and the psychological relief of owning your home outright years earlier is real. The key word is comfortably: the higher payment is mandatory every month, so you need room for it.

A middle path

You don’t have to choose a rigid 15-year to pay off faster. Many people take a 30-year for the lower required payment, then voluntarily pay extra each month to shorten the effective term — getting flexibility plus savings. This keeps your required payment low (helpful in a tight month) while still cutting interest when you can afford to. Just confirm your loan has no prepayment penalty, which most don’t.

The bottom line

A 15-year mortgage saves a fortune in interest and builds equity fast but demands a higher monthly payment; a 30-year keeps payments low and flexible but costs much more over time. Choose the 15-year only if its payment fits comfortably; otherwise the 30-year — perhaps with extra payments when you can — is often the safer, more flexible choice. Run both through the mortgage calculator and decide with real numbers in front of you.

How down payment and rate change the math

Your loan term is one lever, but it works alongside two others — your down payment and your interest rate — and they interact. A bigger down payment shrinks the loan amount, which lowers the payment on either term and can remove PMI, sometimes making a 15-year payment more attainable than you’d expect. The interest rate matters even more on a 30-year loan, because you’re exposed to it for twice as long, so shopping for a lower rate has an outsized effect on total cost. Before fixating on the term, it’s worth running a few combinations: try a larger down payment with a 30-year, or a 15-year at today’s rate, and compare the full picture. The right choice often emerges only when you see how the term, down payment, and rate combine for your specific numbers — which is exactly what a calculator lets you test in a couple of minutes.

Frequently asked questions

Is a 15-year or 30-year mortgage better?

Neither is universally better. A 15-year saves dramatically on total interest and builds equity faster but has a much higher monthly payment. A 30-year keeps payments lower and more flexible but costs far more over time. The right choice depends on whether you can comfortably afford the higher 15-year payment.

How much do you save with a 15-year mortgage?

Often a great deal. On a $300,000 loan, a 15-year term can save over $200,000 in interest versus 30 years, partly because shorter loans usually have slightly lower rates — in exchange for a higher monthly payment. Use a mortgage calculator with each term to see your specific savings.

Can I get a 30-year mortgage and pay it off early?

Yes, and many people do. Take the 30-year for its lower required payment, then voluntarily pay extra each month to shorten the term. This gives you flexibility in tight months plus interest savings when you can afford extra. Just confirm your loan has no prepayment penalty (most don't).

Why is the 15-year payment so much higher?

Because you're repaying the same loan amount in half the time, so each payment must be larger. Even though you pay far less total interest, the monthly principal portion is much bigger. That's why you should only choose a 15-year if its higher payment fits comfortably in your budget.