15-Year vs 30-Year Mortgage: Which Saves More?

Choosing between a 15-year and 30-year mortgage is one of the biggest financial decisions you'll make as a homebuyer. The difference in total interest paid can exceed $100,000 on a typical home purchase. Both options have clear advantages depending on your income, goals, and risk tolerance.

Side-by-Side Comparison

Let's compare both terms on a $350,000 mortgage at current typical rates. A 15-year mortgage at 6.0% has a monthly payment of $2,953 and total interest of $181,535. A 30-year mortgage at 6.5% has a monthly payment of $2,212 and total interest of $446,247. That's a difference of $264,712 in interest — money that stays in your pocket with the shorter term.

Why Choose a 15-Year Mortgage

The math heavily favors 15-year mortgages for borrowers who can handle the payments. You typically get a lower interest rate (0.25% to 0.75% less), you build equity twice as fast, and you own your home free and clear in half the time. For a $350,000 loan, you save over $264,000 in interest.

• Lower interest rate — lenders charge less for shorter terms
• Build equity rapidly — own 50% of your home in about 7 years
• Pay off your mortgage before retirement
• Save $100,000 to $300,000+ in total interest depending on loan size

Why Choose a 30-Year Mortgage

A 30-year mortgage gives you breathing room. The lower monthly payment frees up cash for other goals like investing, building an emergency fund, or handling unexpected expenses. If you invest the $741 monthly difference from our example at 8% average returns, you'd have roughly $353,000 after 30 years — potentially more than the interest savings.

• Lower monthly payment — $741/month less in our example
• More cash for investing, emergencies, or other financial goals
• Easier to qualify — lower payment means lower debt-to-income ratio
• Flexibility — you can always make extra payments toward principal

The Hybrid Strategy: 30-Year with Extra Payments

Many financial planners recommend taking a 30-year mortgage but making extra payments as if you had a 15-year. This gives you the safety of lower required payments while still paying down principal faster. On a $350,000 loan at 6.5%, adding just $400/month extra toward principal cuts 10 years off the term and saves about $140,000 in interest.

When Each Term Makes Sense

Choose 15 years if:

• Your household income comfortably covers the higher payment with room to spare
• You're in your 40s or 50s and want to retire mortgage-free
• You already have a solid emergency fund and retirement savings on track
• You prefer the guaranteed return of eliminating interest over market investing

Choose 30 years if:

• The 15-year payment would stretch your budget uncomfortably thin
• You have high-interest debt to pay off first
• You're disciplined about investing the payment difference
• You value flexibility and a financial safety cushion

Real Example: $400,000 Home Purchase

Bottom Line

If you can comfortably afford the higher payment, a 15-year mortgage is almost always the better financial move. You save six figures in interest and build equity faster. But if the higher payment would leave you house-poor or unable to invest elsewhere, the 30-year gives you valuable flexibility. The worst choice is the 30-year where you spend the savings instead of investing it.