The choice between a 15-year and 30-year mortgage is one of the biggest financial decisions homebuyers face. A 15-year mortgage saves you hundreds of thousands in interest but requires higher monthly payments. A 30-year mortgage gives you breathing room but costs far more over time. Here is exactly how the numbers compare.
The Math: Real Numbers Side by Side
On a $350,000 mortgage, here is what each option looks like at current rates. According to Freddie Mac Primary Mortgage Market Survey data, 15-year rates typically run 0.5-0.75% lower than 30-year rates.
**30-year at 6.5%**: Monthly payment of $2,212, total interest of $446,405, total paid $796,405.
**15-year at 5.85%**: Monthly payment of $2,937, total interest of $178,697, total paid $528,697.
The 15-year mortgage saves $267,708 in interest. The trade-off is a monthly payment that is $725 higher.
When the 15-Year Mortgage Wins
The 15-year mortgage is the better choice when you can comfortably afford the higher payment without stretching your budget past the 28/36 rule recommended by the Consumer Financial Protection Bureau (CFPB). If your household income is high enough that the 15-year payment represents less than 25% of your gross income, you are well positioned.
It also wins when you are mid-career with a stable income and want to enter retirement mortgage-free. A 40-year-old who takes a 15-year mortgage is debt-free by 55, while a 30-year mortgage extends to age 70.
The interest savings are massive. On our $350,000 example, you save $267,708. That money can go toward retirement accounts, investments, or other financial goals.
When the 30-Year Mortgage Wins
The 30-year mortgage is often the smarter choice for first-time buyers, those with variable income, or anyone who values financial flexibility.
The lower monthly payment gives you a larger emergency cushion. Financial experts recommend having 3-6 months of expenses in savings. A $725 lower monthly obligation makes this easier to achieve.
Run the numbers for your situation: Use our free loan amortization calculator to see your exact monthly payment, total interest, and full amortization schedule.
You can invest the difference. If you take the 30-year mortgage and invest the $725 monthly difference in an index fund averaging 7% annual returns (based on historical S&P 500 performance), after 15 years you would have approximately $234,000 in investments. Meanwhile, the 15-year borrower has no mortgage but also no investment portfolio from those payments.
The 30-year also provides flexibility during financial hardship. Job loss, medical expenses, or other emergencies are easier to weather with a lower required payment. You can always make extra payments on a 30-year mortgage when times are good, effectively creating a flexible version of the 15-year option.
The Hybrid Strategy: 30-Year with Extra Payments
The most flexible approach is to take a 30-year mortgage but make payments as if it were a 15-year loan. This gives you the lower required payment of the 30-year (financial safety net) while paying it off in 15-17 years (similar to the 15-year timeline).
On our $350,000 example, making $2,937 payments on the 30-year loan (the 15-year payment amount) pays off the loan in about 15.5 years. You pay slightly more total interest than a true 15-year mortgage (because the rate is higher) but gain the flexibility to drop back to the lower payment if needed.
Use our extra payment calculator to model this exact scenario with your numbers.
Tax Implications
Mortgage interest is tax-deductible for homeowners who itemize deductions. Since the 30-year mortgage generates more interest, it also provides a larger deduction in the early years. However, with the standard deduction at $14,600 for single filers and $29,200 for married filing jointly in 2026, many homeowners no longer benefit from itemizing.
For high-income earners with expensive homes, the mortgage interest deduction can make the 30-year even more attractive on an after-tax basis. Consult a tax professional for your specific situation.
Impact on Home Buying Power
Because the 15-year mortgage has a higher monthly payment, it reduces how much home you can afford. Using the 28% front-end DTI rule, a household earning $100,000 per year can afford approximately a $410,000 home with a 30-year mortgage at 6.5% but only about a $320,000 home with a 15-year mortgage at 5.85%.
This $90,000 difference in buying power can be significant in competitive markets where housing inventory is limited. It may mean the difference between buying in your preferred neighborhood or compromising on location.
What About 20-Year and 25-Year Options?
Some lenders offer 20-year and 25-year terms as a middle ground. A 20-year mortgage typically carries a rate about 0.25% below the 30-year, offering a balance between payment size and interest savings. On our $350,000 example, a 20-year at 6.25% would have a monthly payment of $2,567 and total interest of $266,061.
These terms are worth exploring if the 15-year payment is too high but you want to save more than the 30-year allows. However, not all lenders offer these terms, so you may need to shop around.
The Bottom Line
There is no universally right answer. The 15-year mortgage is mathematically superior if you can comfortably afford the payments. The 30-year mortgage provides flexibility and can be equally smart when combined with disciplined investing or extra payments.
Use our mortgage calculator to run both scenarios with your specific numbers. Compare the total cost, monthly impact, and long-term wealth building potential. The best mortgage term is the one that fits your financial situation, goals, and risk tolerance.