Last updated: October 5, 2026 · Rates in this article are examples for illustration, not current market rates.
Choosing between a 15-year and a 30-year mortgage is one of the biggest money decisions in buying a home. The 30-year loan gives you a lower, more flexible monthly payment. The 15-year loan costs far less in total and makes you debt-free in half the time. The right answer depends on your budget, not on which one is “better” in general.
Here is the math on a $300,000 loan, using example rates of 6.5% for 30 years and 5.75% for 15 years. Fifteen-year loans usually carry lower rates than 30-year loans, so comparing them at the same rate would understate the savings.
15-year vs. 30-year: side-by-side comparison
| 30-year at 6.5% | 15-year at 5.75% | |
|---|---|---|
| Monthly principal & interest | $1,896.20 | $2,491.23 |
| Total interest paid | $382,633 | $148,421 |
| Total of all payments | $682,633 | $448,421 |
| Balance after 15 years | $217,677 | $0 |
The 15-year loan costs $595.03 more per month, but saves about $234,212 in interest. After 15 years, the 30-year borrower still owes $217,677, while the 15-year borrower owns the home outright.
Why the 15-year loan saves so much
Two things work together. First, you borrow the money for half as long, so interest has less time to build up. Second, the larger payment attacks principal from day one. On the 30-year loan, the first payment puts just $271.20 toward principal; most of it is interest. Our guide to how mortgage amortization works explains this in detail.
The lower rate on 15-year loans adds to the savings. Even at the same 6.5% rate, a 15-year loan would cost $2,613.32 a month and about $170,398 in total interest, still less than half of the 30-year total.
The middle path: a 30-year loan with extra payments
Some borrowers take a 30-year loan and voluntarily pay more. If you pay $2,491.23 every month on the 30-year loan at 6.5% (the same amount as the 15-year payment), the extra goes to principal and the loan is paid off in 196 months, about 16.3 years, with total interest of about $187,167.
That is about $38,746 more interest than the true 15-year loan, because the rate is higher. What you buy with that money is flexibility: if you lose income or face a big expense, you can drop back to the lower required payment of $1,896.20 without missing a payment.
When a 15-year mortgage makes sense
- The higher payment fits comfortably in your budget, ideally within the guidelines in how much house you can afford.
- You already have an emergency fund of several months of expenses.
- You are on track with retirement savings, especially any employer match.
- You want to be mortgage-free by a specific date, such as retirement or a child’s college years.
When a 30-year mortgage makes sense
- You need the lower payment to qualify or to keep your budget safe.
- Your income is variable, such as commission or self-employment income.
- You have higher-interest debt to pay off first, or you want to keep investing.
- You want the option to pay extra without the obligation.
Other factors to consider
Mortgage insurance
If you put down less than 20% on a conventional loan, you will likely pay PMI. Because a 15-year loan pays down principal faster, you reach 80% of your home’s original value sooner, so PMI ends earlier. See what PMI is and how to get rid of it.
Closing costs
Closing costs are similar for both terms, since they depend mostly on the loan amount and your location. Learn what to expect in mortgage closing costs explained.
Taxes and opportunity cost
Some homeowners compare mortgage interest with what their money could earn if invested. That comparison depends on investment returns, which are never guaranteed, and on whether you itemize deductions. A tax professional can help you weigh it for your situation.
Run your own numbers
Open our mortgage calculator, enter your loan amount and the rates you have been quoted, then switch the term between 30 and 15 years to see the monthly payment, total interest and full schedule for each.
Frequently asked questions
Is a 15-year mortgage always better than a 30-year?
No. A 15-year loan saves a large amount of interest, but the payment is much higher. If the higher payment leaves you without an emergency fund or retirement savings, a 30-year loan with optional extra payments can be the safer choice.
How much more is a 15-year mortgage payment?
In our example on a $300,000 loan, the 15-year payment at 5.75% is $2,491.23 versus $1,896.20 for a 30-year loan at 6.5%, a difference of $595.03 per month. The gap depends on your loan size and the rates you are offered.
Can I pay off a 30-year mortgage in 15 years?
You can pay it off faster by making extra principal payments, but because 30-year rates are usually higher, it will typically cost more interest than a true 15-year loan. In our example, paying the 15-year amount on a 30-year loan at 6.5% pays it off in about 16.3 years.
Why are 15-year mortgage rates lower?
Lenders take less risk on shorter loans because the money is repaid sooner and there is less exposure to changes in interest rates, so 15-year rates are usually lower than 30-year rates.
Sources: Consumer Financial Protection Bureau: Buying a House; Freddie Mac Primary Mortgage Market Survey (historical 30-year and 15-year rate data). Example calculations by ToolStackIA.
This article is for educational purposes only and is not financial advice. Loan programs, rates and rules change; confirm details with your lender or a HUD-approved housing counselor.