Quick answer: A 15-year mortgage saves you roughly $150,000+ in interest on a $320,000 loan, but the monthly payment is about $900 higher. A 30-year gives you lower payments and more flexibility. The right choice depends on whether you can comfortably handle the higher 15-year payment without sacrificing retirement savings, emergency funds, or quality of life.
This is one of the most consequential financial decisions you'll make as a homebuyer — and it often gets oversimplified. A 15-year mortgage isn't automatically "better" just because it saves interest, and a 30-year isn't "worse" just because it costs more over time. Your income stability, other financial goals, and risk tolerance all factor in.
Let's look at the real numbers with current 2026 rates, then walk through who should choose each option.
Side-by-side comparison
| Feature | 15-year mortgage | 30-year mortgage | Edge |
|---|---|---|---|
| Current avg. rate (Apr 2026) | ~5.55–5.75% | ~6.10–6.30% | 15-yr |
| Monthly payment ($320k loan) | $2,640 | $1,947 | 30-yr |
| Total interest paid | $155,200 | $380,900 | 15-yr |
| Total cost (principal + interest) | $475,200 | $700,900 | 15-yr |
| Time to own free & clear | 15 years | 30 years | 15-yr |
| Equity built after 5 years | ~37% of home value | ~12% of home value | 15-yr |
| Monthly budget flexibility | Less — $700+ more per month | More — lower required payment | 30-yr |
| Income requirement | Higher — need more income to qualify | Lower — easier to qualify | 30-yr |
| Best for | High earners, nearing retirement, aggressive wealth builders | First-time buyers, variable income, want investment flexibility | Depends |
The real cost difference: $320,000 loan
Numbers make this debate concrete. Here's what a $320,000 loan (typical for a $400,000 home with 20% down) looks like with each term at current April 2026 average rates.
$320,000 loan — 15-year vs. 30-year
15-year at 5.65%
30-year at 6.20%
The interest savings are staggering — $229,300 is more than many Americans earn in three years. But look at the monthly payment difference: the 15-year costs $683 more every month, or $8,196 more per year. That's real money that could go toward retirement, investments, college savings, or just enjoying life.
This is why the "right" answer isn't universal. It depends on what you'd do with that $683 per month difference.
Compare both terms with your numbers
Switch between 15 and 30 years in our calculator to see your exact payment difference
Try the mortgage calculatorThe hidden third option: 30-year with extra payments
There's a strategy that many financial advisors recommend as the best of both worlds: take a 30-year mortgage but make extra payments as if it were a 15-year.
With a 30-year at 6.20%, your required payment is $1,957. If you pay $2,640 per month (the same as the 15-year payment), you'd pay off the 30-year mortgage in about 16.5 years — nearly as fast as the 15-year term — while saving roughly $195,000 in interest.
You won't quite match the 15-year savings because the 30-year interest rate is higher (6.20% vs. 5.65%). But you gain a crucial safety net: if you lose your job, face a medical emergency, or have an unexpected expense, you can drop back to the lower required payment of $1,957 without risking default.
With a 15-year mortgage, the $2,640 payment is non-negotiable every single month for 15 years. There's no safety valve.
Important: Before using this strategy, confirm with your lender that there are no prepayment penalties and that extra payments are applied to the principal balance. Most conventional and FHA loans allow unlimited extra payments, but always verify.
When each term makes sense
Choose a 15-year mortgage if...
The payment is under 25% of your gross income
If the 15-year payment fits comfortably within 25% of your gross monthly income (below the 28% guideline), you have enough buffer for other financial goals and emergencies.
You're already maxing retirement contributions
If your 401(k) and IRA are fully funded, paying down your mortgage aggressively is an excellent use of extra cash. The guaranteed return (your interest rate) is hard to beat in a volatile market.
You're 45+ and want to retire mortgage-free
If you're buying in your late 40s or 50s, a 15-year term means you'll own the home outright before retirement — eliminating your largest monthly expense when your income drops.
You have stable, predictable income
Salaried employees with job security, tenured professionals, and dual-income households with cushion are well-suited for the higher fixed payment.
Choose a 30-year mortgage if...
You're a first-time buyer stretching to afford a home
If the 15-year payment would put housing costs above 28% of income, the 30-year keeps you in a comfortable DTI range. You can always pay extra later as your income grows.
You have higher-priority financial goals
If you haven't built an emergency fund, are carrying high-interest debt, or aren't contributing enough to retirement accounts, the $683/month difference is better deployed elsewhere first.
Your income is variable or commission-based
Freelancers, sales professionals, small business owners, and anyone with fluctuating income benefits from the lower required payment as a safety net during lean months.
You'd invest the monthly savings instead
If you take the $683 monthly difference and invest it in index funds earning a historical average of 7 to 10% annually, your investment returns could theoretically outpace the mortgage interest you'd save — though this involves market risk the 15-year doesn't.
The investment argument: is a 30-year actually smarter?
Some financial advisors argue that a 30-year mortgage is the more sophisticated choice because you can invest the monthly payment difference and potentially come out ahead. Here's how the math works.
The 15-year saves you $229,300 in interest. But if you took the $683 monthly difference and invested it in a broad stock market index fund earning 8% annually for 30 years, your investment would grow to approximately $1,012,000.
Even after subtracting the extra $229,300 in mortgage interest you paid, you'd still be ahead by about $783,000 on paper. This is the core argument for the 30-year mortgage from a pure wealth-maximization perspective.
However, this argument has important caveats. It assumes you actually invest the difference every single month for 30 years without fail. It assumes average 8% returns, which includes years of significant losses. It ignores the psychological benefit of owning your home outright. And it doesn't account for the risk that you might need to sell during a market downturn.
The 15-year mortgage gives you a guaranteed, risk-free return equal to your interest rate (5.65% in our example). The investment strategy offers potentially higher returns but with real risk. Your personality and risk tolerance should guide this decision as much as the math.
Refinancing from 30 to 15 years
If you currently have a 30-year mortgage and your finances have improved, refinancing to a 15-year term can be an excellent move. You'll get a lower interest rate, build equity faster, and save significantly on total interest.
Refinancing makes the most sense when your current 30-year rate is significantly higher than today's 15-year rates (a gap of 1% or more usually justifies the refinance costs), you plan to stay in the home for at least 3 to 5 more years to recoup closing costs, and your credit score and equity have improved since your original purchase.
The typical cost to refinance is 2 to 5% of the loan amount. On a $280,000 remaining balance, that's $5,600 to $14,000 in closing costs. Calculate your break-even point: divide the closing costs by your monthly savings to see how many months it takes to recoup the expense. If you'll be in the home past that point, refinancing makes financial sense.
Frequently asked questions
Run both scenarios with your numbers
Switch between 15 and 30 years to see the exact monthly payment and total interest
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