15-Year vs. 30-Year Mortgage in 2026: The Real 10-Year Numbers, Including What You'd Need to Earn Investing the Difference
As of September 17, 2026, Freddie Mac's Primary Mortgage Market Survey puts the average 30-year fixed rate at 6.95% and the average 15-year fixed rate at 6.26%. The standard personal-finance advice for decades has been: take the 30-year loan for the lower payment, then invest the difference — you'll come out ahead because stocks have historically returned more than a mortgage costs. That advice is a real trade-off, not a rule, and at today's rate level the math is closer than most people assume. Below is the actual 10-year comparison on a $400,000 loan, run both ways, with the assumptions shown so you can rerun it with your own numbers. A single-family house in the United States (illustration). Photo: Ryan Hagerty / public-domain-image.com, public domain, Wikimedia Commons . The assumptions, stated up front Loan amount: $400,000. No discount points on either loan. Standard fully-amortizing fixed-rate schedule, no extra principal payments on either loan. Rates: 6.95%...