15-Year vs 30-Year Mortgage: Which Is Better for You?

By the Duvora Tools team · November 7, 2026 · 6 min read · How we write our guides

Choosing a mortgage term is one of the biggest money decisions you'll make. A 30-year loan keeps the monthly payment low; a 15-year loan costs far less overall. Here's how they compare with real numbers, and how to decide.

The numbers side by side

Take a $400,000 home with 20% down, so a $320,000 loan. Fifteen-year mortgages usually come with a lower rate; here we assume 6.5% for 30 years and 5.75% for 15 years.

Property tax, insurance and any HOA fees come on top of both. Run your own scenario in the mortgage calculator, which includes those costs.

Why the 30-year costs so much more

Two things work against the longer loan: you pay interest for twice as many years, and early payments are mostly interest because the balance is still high. On the 30-year loan above, the first payment includes over $1,700 of interest and only about $290 of principal.

Pros and cons

30-year mortgage

• Pros: lower monthly payment, easier to qualify for, more room in your budget for emergencies, retirement saving and other goals.
• Cons: much higher total interest, usually a higher rate, slower equity build-up.

15-year mortgage

• Pros: lower rate, huge interest savings, mortgage-free a decade and a half sooner, equity builds fast.
• Cons: higher payment that can strain your budget and leaves less for investing or emergencies.

The middle path: 30-year loan, extra payments

Many people take a 30-year mortgage for flexibility and then pay extra toward principal whenever they can. You get the safety of a lower required payment, and much of the interest saving of a shorter loan if you stay disciplined. Check your lender has no prepayment penalty and that extra payments go to principal.

What about investing the difference?

The $634 a month you'd save with a 30-year loan could be invested instead. Whether that beats paying off the mortgage early depends on your mortgage rate, the returns you'd earn after tax, and how comfortable you are with market swings. Compare scenarios with the compound interest calculator — just remember investment returns aren't guaranteed, while mortgage interest saved is.

How fast you build equity

Equity is the part of your home you actually own. It matters if you want to sell, refinance or borrow against the house. Here's the remaining loan balance on the same $320,000 loan:

After ten years of payments on the 30-year loan, you've paid off only about 15% of what you borrowed. With the 15-year loan you've paid off more than half. If home prices stay flat or fall, that difference decides whether you can sell without bringing cash to closing.

Worked example: 30-year loan plus $300 a month

Suppose you take the 30-year loan at 6.5% but pay $300 extra every month toward principal — a total of about $2,323 instead of $2,023.

• The loan is paid off in about 21 years instead of 30.
• Total interest falls to about $269,700, saving roughly $138,400.
• If money gets tight, you can stop the extra payments without missing a required payment.

It doesn't beat the 15-year loan's ~$158,300 of interest, because the 30-year rate is higher, but it captures a large part of the saving with far more flexibility.

Don't forget the rest of the monthly payment

Lenders judge affordability on the full payment, often called PITI: principal, interest, property taxes and homeowners insurance, plus PMI if you put down less than 20% and HOA dues if you have them. On a $400,000 home, property tax at 1.1% adds about $367 a month and insurance around $150. Those costs are the same whichever term you choose, so the gap between the two options is just the principal-and-interest difference.

Situations where each loan wins

If you have card balances, paying them off first almost always beats paying a mortgage early. See how to pay off credit card debt fast.

What about a 20-year mortgage?

Many lenders also offer 20-year (and sometimes 10- or 25-year) terms. They sit in between: on the same $320,000 loan at an assumed 6.125%, a 20-year mortgage costs about $2,316 a month with roughly $235,800 in total interest.

The 20-year option saves about $172,000 of interest compared with 30 years for under $300 a month more — a good compromise if the 15-year payment feels too tight. Not every lender advertises it, so ask.

Biweekly payments: a painless shortcut

Paying half your monthly payment every two weeks means 26 half-payments a year — the same as 13 full payments instead of 12. On the 30-year example, that extra payment each year pays the loan off in about 24 years and saves roughly $93,000 in interest.

You can get the same effect without a special programme by adding one-twelfth of your payment (about $169 here) to every monthly payment. Avoid services that charge a fee to set up biweekly payments — you can do it yourself for free.

Common mistakes when choosing a term

• Stretching to a 15-year loan with no emergency fund. A job loss or big repair can then force you onto credit cards. Build three to six months of expenses first.
• Comparing payments but not total cost. Always look at total interest and the APR on each Loan Estimate, not just the monthly figure.
• Ignoring closing costs and points. A lower rate that requires paying several thousand dollars in points may not pay off if you sell or refinance within a few years.
• Forgetting retirement savings. If a 15-year payment means you stop contributing to a workplace plan with an employer match, you lose free money that usually beats the mortgage saving.
• Assuming you can always refinance later. Rates may not fall, and refinancing has costs. Choose a term you're comfortable with today.

Outside the US: how terms work elsewhere

The 15-vs-30 decision is mostly an American one, because 30-year fixed rates are unusual in other countries. In the UK, mortgages commonly run 25–35 years, but the rate is usually fixed for only two to five years before you remortgage. In Canada, amortisation is often 25 years with a term of around five years, after which you renew at the current rate. Australian loans are typically 25–30 years with variable or short fixed rates.

The underlying trade-off is the same everywhere: a shorter amortisation means higher payments and much less interest. Many UK, Canadian and Australian lenders allow overpayments each year without penalty — often a percentage of the balance — which lets you shorten the loan without committing to a higher required payment. Check your lender's overpayment allowance before choosing a longer term.

Questions to ask your lender

1. What are your current rates for 15-, 20- and 30-year fixed loans with my credit score and down payment?
2. Is there a prepayment penalty if I pay extra?
3. How do I make sure extra payments go to principal, not future payments?
4. What closing costs and points are included in each quote?
5. When and how can I remove PMI if my down payment is under 20%?

Get written Loan Estimates from at least three lenders on the same day so the comparison is fair.

How to decide

• Choose a 15-year loan if the higher payment fits comfortably (ideally housing under 28% of gross income), you have an emergency fund, and you're already saving for retirement.
• Choose a 30-year loan if you want a lower required payment, have variable income, or would rather invest the difference.
• Either way, shop several lenders: a 0.5% lower rate saves tens of thousands over the life of the loan.

Key takeaways

Frequently asked questions