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

How a 15-Year Mortgage Works

A 15-year mortgage does exactly what it sounds like: you pay off your entire home loan in 180 monthly payments. The trade-off is a significantly higher monthly payment in exchange for a lower interest rate and dramatically less total interest paid. On a $350,000 home with 20% down ($280,000 loan), a 15-year fixed at 5.81% runs about $2,334/month for principal and interest. That’s roughly $550–$600 more per month than the 30-year option.

The rate discount on 15-year loans typically ranges from 0.50% to 0.75% below 30-year rates. That spread matters more than most people realize. You’re not just saving on rate — you’re also cutting the number of years interest compounds against you in half. The result is a total interest bill of roughly $140,000 over the life of the loan. You can see exactly how this breaks down month-by-month using our amortization schedule tool.

Equity builds fast with a 15-year. After just five years, you’ll own about 28% of your home’s value (assuming the 20% you put down plus principal payoff). With a 30-year, you’d own roughly 23% at the same point. That gap widens every year and gives you more flexibility for a future home equity line of credit or a stronger position if you need to sell.

How a 30-Year Mortgage Works

The 30-year fixed-rate mortgage is the default for a reason — it stretches your payments across 360 months, keeping the monthly obligation as low as possible. Using the same $280,000 loan at 6.47%, your principal and interest payment comes to about $1,764/month. That $570 gap between this and the 15-year payment is real money you can redirect toward other goals. Run your own numbers with our mortgage calculator to see the exact difference for your loan amount.

The downside is brutal when you look at total cost. That same $280,000 loan at 6.47% over 30 years generates roughly $355,000 in total interest. Compare that to $140,000 on the 15-year — you’re paying an extra $215,000 for the privilege of lower monthly payments. The first several years of a 30-year loan are especially inefficient: in year one, about 63% of every payment goes to interest, not principal.

But here’s what the math-only crowd misses. The 30-year’s lower payment requirement gives you options. You can invest the $570 monthly difference in index funds averaging 7-8% annual returns. You can build an emergency fund. You can avoid being “house poor” — owning an expensive asset while struggling to cover a car repair. The 30-year is a risk management tool, not just a loan term.

Key Differences Between 15-Year and 30-Year Mortgages

The interest rate gap is the starting point. As of June 18, 2026, 15-year fixed rates average around 5.81% while 30-year rates sit near 6.47% (Freddie Mac PMMS) — a spread of about 0.66 percentage points. That spread has an outsized impact because it compounds over such different time horizons. On a $280,000 loan, the 15-year saves you about $215,000 in interest — roughly 77% of the original loan amount. Check today’s exact spread on our current mortgage rates page.

Monthly cash flow is the most immediate difference people feel. The 15-year demands approximately $2,334/month versus $1,764 for the 30-year on that same $280,000 loan. That $570 difference means you need a higher income to qualify. Lenders typically want your total housing costs (PITI) below 28% of gross monthly income. For the 15-year payment, you’d need roughly $100,000/year in household income just for the mortgage portion. The 30-year drops that threshold to about $75,600.

Qualification standards differ too. Because the 15-year payment is higher relative to income, lenders scrutinize your debt-to-income ratio more carefully. If you’ve got a $500/month car payment and $300 in student loans, the 15-year becomes much harder to qualify for. The 30-year’s lower payment gives you more breathing room under the 43% total DTI cap most lenders enforce.

There’s also an opportunity cost argument that favors the 30-year. If you take the 30-year and invest the $570/month difference in a broad stock index fund returning 7% annually, after 15 years you’d have roughly $181,000. Meanwhile, the 15-year borrower owns the home free and clear but has $0 in that investment account. The math gets close — and the “right” answer depends on whether you trust yourself to actually invest the difference every month (most people don’t).

When to Choose a 15-Year Mortgage

The 15-year makes the most sense if you can comfortably afford the higher payment without sacrificing retirement contributions or your emergency fund. A good rule of thumb: if the 15-year PITI payment stays below 20% of your gross income, you’re in strong shape. That means a household earning $140,000+ for our $350,000 home example. You should also have at least six months of expenses saved before committing to the higher payment — job loss with a $2,334/month obligation hits harder than $1,764.

It’s also the better pick if you’re buying in your late 40s or 50s and want the mortgage gone before retirement. Carrying a $1,764 payment into your 70s on a fixed income is a real risk. The 15-year lets someone buying at 50 be debt-free by 65. Use our affordability calculator to stress-test whether the higher payment works with your full financial picture.

When to Choose a 30-Year Mortgage

Most first-time buyers should choose the 30-year. Not because it’s cheaper overall — it absolutely isn’t — but because the lower required payment protects you during the most financially volatile years of homeownership. The first two years after buying a home are when unexpected costs hit hardest: the HVAC fails, the roof needs patching, property taxes get reassessed upward. Having $570 extra per month in your budget absorbs those shocks without putting you on a credit card treadmill.

The 30-year is also the right call if you’re carrying other high-interest debt. Paying $570/month extra toward a 6.47% mortgage while sitting on $15,000 in credit card debt at 22% APR is objectively bad math. Take the 30-year, kill the credit card debt first, then make extra principal payments on the mortgage when you can. Nothing stops you from paying a 30-year loan off in 20 years — you just aren’t required to make the higher payment every month.

Common Mistakes to Avoid

Choosing the 15-year and depleting your savings. Some buyers drain their emergency fund to make the down payment, then lock into the higher 15-year payment. When the water heater dies three months later, they’re financing a $4,500 repair on a credit card at 24% APR. Keep six months of expenses liquid before committing to the 15-year.

Ignoring the tax implications. Mortgage interest is deductible if you itemize. The 30-year generates far more deductible interest in the early years, which can offset part of the cost difference. On a $280,000 loan at 6.47%, you’ll pay roughly $18,100 in interest in year one. At a 24% marginal tax rate, that’s a $4,344 tax benefit. The 15-year generates about $16,300 in year-one interest — a smaller deduction. This doesn’t change the overall math dramatically, but it’s worth factoring in.

Planning to “invest the difference” without automating it. The 30-year-plus-investing strategy only works if you actually set up automatic transfers to a brokerage account on the same day your mortgage payment hits. Study after study shows that people who plan to invest the savings end up spending it. If you won’t automate it, the 15-year is the better forced savings plan.

Not considering a 20-year or 25-year term. These aren’t as common, but many lenders offer them. A 20-year on $280,000 at roughly 6.00% runs about $2,007/month — splitting the difference between the two extremes. It saves substantially on interest ($201,600 total) without the full payment shock of the 15-year.

Refinancing plans that never materialize. “I’ll take the 30-year now and refinance to a 15-year when rates drop” sounds reasonable. But rates may not drop for years, and refinancing costs $3,000-$6,000 in closing costs. Don’t bank your financial plan on a rate environment you can’t control.

Frequently Asked Questions

How much do you actually save with a 15-year mortgage?

On a $280,000 loan, the total interest paid on a 15-year at 5.81% is roughly $140,000, compared to about $355,000 on a 30-year at 6.47%. That’s a savings of $215,000. The exact amount depends on your rate and loan size, but the savings typically range from 55-65% of the 30-year’s total interest cost. The lower rate on the 15-year compounds the savings beyond just the shorter term.

Can I pay off a 30-year mortgage in 15 years?

Yes, and this is a legitimate strategy. If you take a 30-year at 6.47% and make extra principal payments equal to the 15-year payment amount, you’d pay off the loan in about 15.5 years. The catch is you’ll pay the higher 6.47% rate the entire time instead of the 15-year’s 5.81%. That costs you roughly $12,000-$15,000 more in interest compared to just getting the 15-year upfront. The benefit is flexibility — you can drop back to the minimum payment during tough months.

Which mortgage term is better for building equity?

The 15-year builds equity roughly 40-50% faster in the early years. After five years on a $280,000 loan, the 15-year borrower has paid down about $72,000 in principal versus $26,000 on the 30-year. That equity difference matters if you need to sell or want to tap your home’s value later. By year 10, the 15-year borrower owes just $130,000 while the 30-year borrower still owes $237,000.

Do lenders prefer 15-year or 30-year mortgages?

Lenders don’t have a strong preference — they profit from both. The 15-year carries less risk for the lender (shorter exposure, faster payoff), which is why the rate is lower. Your approval odds depend more on your DTI ratio, credit score, and down payment than the term you choose. If your DTI is tight, the 30-year’s lower payment might actually make you more likely to get approved.

What income do I need for a 15-year mortgage on a $350,000 home?

Assuming 20% down ($280,000 loan), 5.81% rate, $350/month taxes and $150/month insurance, your total PITI is roughly $2,834. To stay under the 28% front-end ratio, you’d need about $121,000 in annual gross income. For the 30-year at the same home price, the threshold drops to roughly $97,000. These are rough figures — your actual requirements depend on other debts and the specific lender’s guidelines.

Is the 15-year mortgage a good idea if I’m in my 30s?

It can be, but only if your retirement savings are on track. A 35-year-old choosing the 15-year should already be contributing at least 10-15% of income to retirement accounts. If the higher mortgage payment forces you to cut 401(k) contributions, the 30-year is almost certainly better. An employer match you’re missing is an immediate 50-100% return — no mortgage savings can compete with that.

How does inflation affect the 15-year vs 30-year decision?

Inflation favors the 30-year borrower. Your fixed payment of $1,764 feels expensive today, but after a decade of 3% average inflation, that same payment has the purchasing power of roughly $1,313 in today’s dollars. The 30-year gives you more years of paying back “cheaper” dollars. The 15-year borrower pays higher amounts in the early years when dollars are worth more, then has no payment at all after year 15. High-inflation environments generally tilt the math toward the 30-year.

Should I put more down to afford the 15-year payment?

Only if you’d still keep six months of expenses in reserve after closing. Putting 25% or 30% down to shrink the loan and make the 15-year payment manageable can work well. On a $350,000 home, going from 20% to 25% down reduces the loan from $280,000 to $262,500 and drops the 15-year payment from $2,334 to $2,188. But if that extra $17,500 in down payment empties your savings, you’re trading one risk for another.