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

Choosing between a 15-year and 30-year mortgage is one of the biggest financial decisions you'll make. The 30-year is the popular choice — but it costs dramatically more over time. Here's the honest comparison.

The Numbers: $400,000 Mortgage Example

• 30-year at 7.0%: Monthly payment $2,661 | Total interest paid: $558,036
• 15-year at 6.5%: Monthly payment $3,488 | Total interest paid: $227,840
• Difference: $827/month higher payment, but $330,196 LESS interest over the life of the loan

Why the 15-Year Rate Is Lower

Lenders charge less interest on 15-year mortgages because the risk period is shorter. You'll typically get a rate 0.5–0.75% lower than a 30-year loan. Combined with the shorter payoff period, this dramatically reduces total interest.

The Case for the 30-Year Mortgage

• Lower monthly payment gives you cash flow flexibility
• Difference can be invested — if you invest $827/month at 8% return over 30 years, that's over $1.2 million
• Keeps more liquidity for emergencies
• You can always make extra payments to pay it off faster

The Case for the 15-Year Mortgage

• Guaranteed savings of $330,000+ in interest — no investment risk
• Build equity much faster (own your home outright in 15 years)
• Lower interest rate from the start
• Forced savings discipline

Which Should You Choose?

If you can comfortably afford the 15-year payment (without straining your budget), it's mathematically superior for most people. If the higher payment would leave you cash-strapped, choose the 30-year and make extra principal payments whenever possible. You get flexibility without locking in the obligation.