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

Choosing between a 15-year and a 30-year mortgage is one of the biggest financial decisions you will make. The 30-year offers lower payments; the 15-year saves a fortune in interest. See how the numbers work for your home price with our Mortgage Calculator, which shows both monthly payments and total interest for any term.

The Core Trade-Off

The decision comes down to a single trade-off:

30-year mortgage: Lower monthly payments, but you pay interest for twice as long and much more of it in total.

15-year mortgage: Higher monthly payments, but dramatically less total interest and a faster path to owning your home outright.

The Numbers: A $400,000 Home with 20% Down

Let's compare a $320,000 loan (after a $80,000 down payment) at a 6.25% interest rate, using August 2026 average rates:

30-Year Fixed:

• Monthly payment (P&I): $1,970
• Total interest paid: $389,000
• Total cost: $709,000
• Years to payoff: 30

15-Year Fixed:

• Monthly payment (P&I): $2,744
• Total interest paid: $174,000
• Total cost: $494,000
• Years to payoff: 15

The 15-year mortgage costs $774 more per month but saves $215,000 in interest — and you own the home 15 years sooner.

Why the 30-Year Is So Popular

The 30-year fixed mortgage is America's default for good reasons:

• Lower monthly payment: Qualifies for more house, or keeps more cash free each month
• Flexibility: The difference in payment can be invested, saved, or used for other goals
• Lower risk: If income drops, a smaller fixed payment is easier to manage
• Inflation friendliness: You repay in dollars that are worth less over time

Why the 15-Year Is Powerful

The 15-year mortgage is a forced savings plan with real advantages:

• Guaranteed ~6%+ return: The interest you avoid is a risk-free, tax-free return on your money
• Faster equity: You build equity roughly twice as fast
• Retirement alignment: Pay off your home before or near retirement, lowering your expenses
• Less total cost: Hundreds of thousands in interest savings

The Middle Ground: Paying Extra on a 30-Year

Many financial planners recommend a hybrid approach: take the 30-year for flexibility, then make extra principal payments as you can afford them.

Example: On that $320,000, 6.25% 30-year loan, adding $200/month to principal shortens the loan to about 25 years and saves roughly $68,000 in interest. You get most of the 15-year's benefits without committing to the higher payment.

Which Should You Choose?

Choose a 15-year mortgage if:

• You can comfortably afford the higher payment
• You have a solid emergency fund
• You're not sacrificing retirement contributions to make the payment
• You want guaranteed interest savings and faster equity

Choose a 30-year mortgage if:

• You want the lowest possible monthly payment
• You plan to invest the difference (historically, markets beat mortgage rates over long horizons)
• You expect to move within 5-10 years (you won't benefit from the payoff)
• You want maximum financial flexibility

A Warning: Don't Overstretch

The biggest mistake is choosing a 15-year mortgage that eats your budget. If the higher payment means you can't fund retirement accounts or build an emergency fund, the 30-year with extra payments is almost always the smarter choice. A mortgage you can't afford in an emergency can cost you the home entirely.

Real-World Context

Mortgage rates have eased in 2026. As of August 2026, the average 30-year fixed rate was around 6.15% and the average 15-year rate about 5.55%, according to Freddie Mac. On a $320,000 loan, that ~0.6% spread means the 15-year's higher payment is even more rewarding — but the decision still hinges on your budget, not just the math.

Conclusion

The 15-year mortgage is mathematically superior; the 30-year is often practically superior. The best answer for most people is the 30-year with disciplined extra payments. Compare the exact numbers for your home price, down payment, and rate using our Mortgage Calculator before you commit.