Head-to-head · Mortgages

15-year vs 30-year mortgage

15-year vs 30-year mortgage compared: monthly payment, total interest, flexibility, and who each term is actually best for. Use our free calculator to run the numbers on your own loan.

Updated April 2026 · 7 min read

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The 15-year versus 30-year mortgage decision is the single biggest lever in most American home-buying budgets. On a $400,000 loan at realistic 2026 rates, the gap between the two choices is often more than $150,000 of lifetime interest — enough to fund a child's college education, a retirement head start, or an entirely second property. But the 15-year term isn't a universal winner: it comes with a payment that's typically 40 to 60 percent higher, and that higher payment has crushed more households than high rates ever did. This page lays out exactly how the math works, who should pick which, and where the decision gets genuinely hard.

Option 1

15-year mortgage

Shorter term, higher payment, much less interest over the life of the loan.

Best for

Buyers with stable dual incomes, a healthy emergency fund (6+ months), and enough room in their budget that the higher payment won't crowd out retirement contributions or force a home-rich / cash-poor lifestyle.

Pros

Interest rate is typically 0.5–0.75 points lower than the 30-year.
Total interest paid is roughly 55–65 percent lower over the life of the loan.
Builds equity dramatically faster — you're mostly paying principal by year 5.
Forces disciplined repayment; fewer people 'borrow against the house' to renovate.
Done in 15 years — gives you a fully paid-off home well before most people's retirement window.

Cons

Monthly payment is 40–60 percent higher than the 30-year at the same loan size.
Less room for emergencies — a job loss on a tight 15-year payment is far scarier.
Can crowd out retirement contributions; missing the 401(k) match to make the payment is usually a bad trade.
Less flexibility: you can't 'recast' a 30-year payment down in a bad year.
Pushes some buyers into a smaller house than they could otherwise comfortably afford.

Option 2

30-year mortgage

Longer term, lower monthly payment, substantially more interest paid over time.

Best for

First-time buyers, single-income households, anyone with variable income (freelancers, commission-based sales), and anyone who intends to aggressively fund retirement accounts before accelerating house payments.

Pros

Lowest possible monthly payment for a given loan size.
Keeps your cash-flow flexible for emergencies, investments, and retirement contributions.
You can make extra payments any month you want — a 30-year with $500 extra monthly pays off in ~20 years.
Historically, long-term investments have returned more than the spread between mortgage rates and market returns — so carrying low-rate debt can be mathematically optimal.
If you refinance or move within 7 years (the median homeowner does), most of the '30-year interest' never actually happens.

Cons

Total interest is dramatically higher if you run the term out — often 2× the original loan balance.
You build equity slowly; the first 5 years are almost all interest.
Easier to feel 'house-rich' and over-borrow into a larger home than is prudent.
Some buyers never actually make the extra payments they planned to.
At retirement, still making mortgage payments is a stressor many underestimate.

The verdict

If your monthly budget clears the 15-year payment with at least 20 percent headroom, you have a fully funded emergency fund, and you are already capturing your full 401(k) match, the 15-year is almost always the better deal. For everyone else — which is most first-time buyers — take the 30-year and pay it down like a 20-year by adding one extra principal payment every quarter. You get 80 percent of the interest savings with 100 percent of the flexibility. The worst outcome is signing up for the 15-year, then defaulting or scaling back retirement savings to make the payment work.

A concrete example: $400,000 loan, 2026 rates

At a 6.25% rate on a 30-year and a 5.5% rate on a 15-year, a $400,000 loan costs roughly $2,463/mo on the 30-year and $3,267/mo on the 15-year. Over the life of the loan, the 30-year version pays about $486,000 in interest; the 15-year pays about $188,000. That's $298,000 of interest avoided — but at a cost of $804/mo extra in payments for 15 years (roughly $145,000 of extra cash). The math says the 15-year 'wins' — provided you would have saved the difference anyway. If the 'savings' would have gone to lifestyle inflation, the 30-year plus aggressive 401(k) contributions is often the better real-world outcome.

The hidden third option: 30-year with extra principal payments

Most people never compare this, but it's often the best choice. Take the 30-year mortgage, commit to making 13 payments per year (the 'biweekly' trick), and the loan pays off in about 22–24 years with interest savings of 30–40 percent. You keep the low required payment for months when cash is tight, and accelerate in months when it isn't. Almost all lenders accept extra principal payments with no penalty.

Run the numbers yourself

Plug your own inputs into the free tools below — no signup, works in your browser, nothing sent to a server.

Free tool15-Year Mortgage CalculatorSee what a 15-year fixed mortgage payment looks like — and how much interest a shorter term saves vs a 30-year loan.Open tool →Free tool30-Year Mortgage CalculatorEstimate monthly payments on a 30-year fixed-rate mortgage, including principal, interest, property tax, and insurance.Open tool →

Frequently asked questions

Is a 15-year mortgage always better if you can afford it?

Not always. The 15-year has a guaranteed interest rate return; aggressive retirement investing historically has a higher (but not guaranteed) return. If taking the 15-year means contributing less to a 401(k) match, the 30-year plus full match is almost always the better lifetime outcome.

How much higher is the 15-year monthly payment?

Roughly 40 to 60 percent higher than the 30-year at the same loan size. For a $400,000 loan at recent rates, that's about $800 more per month.

Should I refinance a 30-year into a 15-year?

Only if the new 15-year payment is comfortable at current rates, closing costs pay back within 3 years, and you have no higher-return uses for the cash (paying off 8%+ APR debt, maxing retirement accounts, etc.).

Do lenders charge prepayment penalties?

Most US conventional mortgages issued in the last decade do not. Always check the note — a few non-QM loans still have them in the first 2-3 years.

What's a 20-year mortgage and how does it fit?

A middle ground, available from many lenders. Payment is only 15–20 percent higher than a 30-year, and you're done in 20 years with interest savings close to the 15-year. Worth pricing.