The 15-year vs 30-year mortgage decision is one of the most consequential choices in a home purchase. It changes your monthly payment by hundreds of dollars, your total interest paid by hundreds of thousands, and the price range you can qualify for. As of May 21, 2026, Freddie Mac's Primary Mortgage Market Survey reported the 30-year fixed rate at 6.51% and the 15-year fixed rate at 5.85% — a 66 basis point spread that tilts the math in the 15-year's favor on pure interest cost, but at the price of a substantially higher monthly payment.
Compare both terms side by side
Plug in your loan amount and see the monthly payment, interest, and amortization for both 15-year and 30-year terms.
Open Mortgage Calculator →Head-to-Head: 15-Year vs 30-Year at a Glance
| Feature | 30-Year Fixed | 15-Year Fixed |
|---|---|---|
| Typical rate (May 2026) | 6.51% | 5.85% |
| Monthly payment ($400k loan) | $2,528 | $3,344 |
| Total interest paid | $510,178 | $201,920 |
| Years until equity = 50% of loan | ~19 years | ~8 years |
| Required income (28% DTI rule) | ~$108k/yr | ~$143k/yr |
| Refinance flexibility | Higher cash flow makes it easier | Tighter cash flow makes it harder |
Rates from Freddie Mac PMMS, week ending May 21, 2026. Payment figures principal and interest only.
The Case for a 30-Year Mortgage
Lower monthly payment. Cash flow is the most important financial cushion a household has. A $2,528 payment instead of $3,344 leaves $816 per month for emergencies, retirement contributions, or simply not feeling broke.
Flexibility to prepay. Most conventional mortgages carry no prepayment penalty. You can take a 30-year loan and voluntarily pay it off in 18 years by adding extra principal — but the lender cannot force you to write the bigger check if your income drops.
You qualify for more house. Lenders cap your debt-to-income ratio at roughly 43–50% depending on the loan program. The lower 30-year payment leaves more DTI headroom, often letting you borrow 25–30% more for the same income.
Tax deduction lasts longer. If you itemize, mortgage interest on up to $750,000 of acquisition debt is deductible. The 30-year produces more interest each year for longer, which can matter for high-income households who itemize.
The Case for a 15-Year Mortgage
You pay less than half the interest. On the $400k example: $201,920 of total interest on the 15-year versus $510,178 on the 30-year. That gap — over $308,000 — is real money that stays in your pocket.
The rate itself is lower. The 15-year rate has averaged 0.5–0.8 percentage points below the 30-year for decades. As of May 21, 2026, the spread is 66 basis points. Lenders charge less because they are exposed to interest-rate risk for half as long.
You build equity twice as fast. After 5 years on a $400k loan, the 15-year borrower owes about $293k (27% paid down). The 30-year borrower owes about $373k (only 7% paid down). Faster equity means more options if you want to sell, refinance, or take a home equity line.
It enforces savings. The behavioral case for the 15-year is honest: most people who plan to "take the 30-year and invest the difference" don't actually invest it. They spend it. The 15-year forces the saving.
"Take the 30-Year and Invest the Difference" — Does It Actually Work?
The classic argument for the 30-year is that the $816/month difference, invested in the stock market, will outperform the interest savings of the 15-year. The math depends entirely on returns and discipline.
| Scenario | 15Y Mortgage Wealth Gain | 30Y + Invest Difference |
|---|---|---|
| After 15 years, 7% market return | Owe $0, saved $308k interest | ~$260k in brokerage, still owe $241k |
| After 30 years, 7% market return | Free + 15 yrs of full payment invested → ~$770k | ~$985k in brokerage, mortgage paid |
| After 30 years, 4% market return | ~$556k | ~$564k |
Illustrative. Assumes consistent investing every month with no missed contributions and no tax drag. Real-world results vary materially.
The honest takeaway: the 30-year-plus-invest strategy wins on paper if you earn solid market returns and never miss an investment contribution. The 15-year wins on certainty. If you cannot promise yourself you will invest the difference every single month for 30 years, the 15-year is the safer wealth-building choice.
When to Choose Which
Choose a 15-year if:
- Your income is high enough that the payment is comfortable, not a stretch.
- You are already maxing tax-advantaged retirement accounts (401(k), IRA, HSA).
- You are within 15–20 years of your target retirement and want the mortgage gone first.
- You value the rate discount and the forced-savings discipline.
Choose a 30-year if:
- The 15-year payment would push your DTI above 36% or strain your cash flow.
- You have other goals (emergency fund, retirement matching, kids' college) you are still building.
- Your income is variable or commission-based.
- You plan to move within 5–7 years and want maximum flexibility.
Test both terms with your real numbers:
Open Mortgage Calculator →Frequently Asked Questions
Is a 15-year or 30-year mortgage better?
A 15-year mortgage costs roughly half the total interest of a 30-year loan and typically carries a rate 0.5–0.8% lower. The 30-year wins on monthly cash flow and flexibility. The right answer depends on your income stability, other savings goals, and whether you would actually invest the monthly difference if you chose the 30-year.
How much higher is a 15-year mortgage payment?
At May 2026 rates (6.51% for 30-year, 5.85% for 15-year per Freddie Mac PMMS), a $400,000 loan costs about $2,528/month for 30 years versus $3,344/month for 15 years — roughly 32% more per month. Over the life of the loan you pay $510,000 in interest on the 30-year versus $201,000 on the 15-year.
Why are 15-year mortgage rates lower than 30-year?
Lenders take less interest-rate risk on a shorter loan and face fewer years of potential default. They pass that lower risk on as a lower rate. The spread between 15-year and 30-year rates typically runs 0.5–0.75 percentage points and was 0.66% as of May 21, 2026.
Can I pay off a 30-year mortgage in 15 years instead?
Yes. Most conventional mortgages have no prepayment penalty. Making one extra monthly payment per year, or paying biweekly, shortens a 30-year loan by 4–6 years. To match a true 15-year payoff on a $400k 30-year loan at 6.51%, you would need to pay about $3,580/month — slightly more than the actual 15-year payment at 5.85% because the 30-year rate is higher.
Does a 15-year mortgage help me qualify for a lower rate but a smaller house?
Yes. Because lenders qualify you based on monthly debt-to-income ratio, the higher 15-year payment means you qualify to borrow less — typically 25–30% less. If you are stretching to afford a home, the 30-year is usually the only option that fits the lender's DTI cap.
Sources & Further Reading
- Freddie Mac — Primary Mortgage Market Survey — current 15Y and 30Y rates.
- CFPB — Mortgage product basics.
- IRS Publication 936 — Home Mortgage Interest Deduction.
- FRED — 15-Year Fixed Rate Mortgage Average.
For informational purposes only. Not financial advice. Verify current rates with a licensed lender before locking.