The usual way to argue this is to put two interest totals side by side and let the bigger one win. Then the reader runs the payment, finds it is a third higher, and quietly takes the 30-year anyway.
That is the wrong frame. The 15 year vs 30 year mortgage decision is not about which number is bigger. It is about what the extra payment buys compared with what else that money could do. It is also about whether the answer holds when you run it honestly, instead of assuming the stock market bails you out. Every figure below comes from published federal rate data and arithmetic you can check. DollarVisor takes no payment for placement: companies cannot pay for position in our rankings.
Here is a short walkthrough of the two terms before we get into the numbers.
1. Which Term Should You Pick?
Quick Answer: Our pick is the 15-year for buyers who can cover the higher payment without cutting retirement contributions or their emergency fund. Everyone else should take the 30-year and overpay by choice. The gap is $794 a month on a $400,000 loan, and that gap is the whole decision. Start with how home loans work if the basics are fuzzy.
Both terms are the same product from the same lender with, usually, the same closing costs. The only differences that matter are the rate, the required monthly payment, and how long the debt sits on your balance sheet.
- Take the 15-year if the higher payment still leaves you funding retirement, holding three to six months of expenses, and sleeping fine in a bad month.
- Take the 30-year if that payment would push housing past roughly a third of take-home pay, or if your income moves month to month.
- Take the 30-year and overpay if you want most of the savings without the bigger required payment. Section 6 shows what that costs.
Companies cannot pay for placement in our rankings. Every number below is federal data or arithmetic you can repeat in a spreadsheet.
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2. How Big Is the Rate Gap Right Now?
Quick Answer: The 15-year discount is 0.71 percentage points as of August 13, 2026: 5.96% against 6.67%. That is narrower than the 0.87-point gap a year earlier, so the shorter term is buying less rate relief than it did in 2025. A loan above the conforming limit prices differently again.
Lenders charge less for 15-year money because they get it back sooner. The discount is real but smaller than most people assume, and it has never been the main reason the 15-year wins.
Both figures come from Freddie Mac’s Primary Mortgage Market Survey, which tracks conforming purchase loans for buyers putting 20% down with strong credit. With weaker credit, both quotes move up together and the gap stays about the same.
| Measure | 30-year fixed | 15-year fixed | Edge |
|---|---|---|---|
| Survey rate | 6.67% | 5.96% | 15-year |
| Payment on $400,000 | $2,573 | $3,367 | 30-year |
| Total interest paid | $526,337 | $206,022 | 15-year |
| Interest as share of loan | 132% | 52% | 15-year |
| Debt-free in | 2056 | 2041 | 15-year |
| Balance after 15 years | $292,245 | $0 | 15-year |
Rates: Freddie Mac Primary Mortgage Market Survey, August 13, 2026. Payment, interest and balance figures are DollarVisor calculations on a $400,000 loan, principal and interest only.
Notice the last row. After 15 years of payments the 30-year borrower still owes $292,245, nearly three-quarters of the original loan. That balance is what the money you did not put into the house has to beat.
3. What Does the Payment Difference Cost You?
Quick Answer: The 15-year payment runs about 31% higher at every loan size, and the interest saving lands at 61% every time. On a $250,000 loan that is $496 more a month to save $200,197. On a $650,000 loan it is $1,290 more to save $520,511. The ratios do not move: only the dollars do.
Both the payment premium and the interest saving scale in a straight line with loan size, so you do not need to model your exact loan. You only need to know whether you can carry 31% more each month.
| Loan amount | Extra per month | Total interest saved |
|---|---|---|
| $250,000 | $496 |
$200,197 |
| $325,000 | $645 |
$260,256 |
| $400,000 | $794 |
$320,314 |
| $500,000 | $992 |
$400,393 |
| $650,000 | $1,290 |
$520,511 |
DollarVisor calculations at 6.67% for 30 years and 5.96% for 15 years, per the Freddie Mac survey of August 13, 2026. Principal and interest only; taxes, insurance and any mortgage insurance are excluded. Bar widths are proportional to the largest saving.
For scale, the median new home sold for $410,700 in the second quarter of 2026, per Federal Reserve Economic Data. With 20% down that is a loan just above the $325,000 row, so the middle of this table is where most buyers sit.
4. How Much House Does Each Term Buy?
Quick Answer: At the same monthly payment, a 15-year mortgage borrows about 76% of what a 30-year borrows. A $2,500 payment supports $388,628 over 30 years but only $297,019 over 15: a $91,609 difference in buying power. That gap, not the interest total, is why most buyers end up on the longer term.
This is the lens almost nobody publishes, and it decides real transactions. Buyers do not shop for a loan amount. They shop for a house, decide what they can pay monthly, and let the lender say what that buys.
| Monthly budget | Borrows over 30 years | Borrows over 15 years | Buying power lost |
|---|---|---|---|
| $2,000 | $310,902 | $237,615 | $73,287 |
| $2,500 | $388,628 | $297,019 | $91,609 |
| $4,000 | $621,804 | $475,230 | $146,574 |
| $5,000 | $777,255 | $594,038 | $183,218 |
DollarVisor calculations at 6.67% for 30 years and 5.96% for 15 years, per the Freddie Mac survey of August 13, 2026. Budgets cover principal and interest only, so real approvals fall once taxes and insurance are added.
The 76% ratio holds at every budget line. To reach the 2026 conforming loan limit of $832,750 you need $5,357 a month on a 30-year and $7,009 on a 15-year. Above that limit you are shopping jumbo pricing, not these survey rates.
Still deciding which loan program to use?
Term length is only half the decision: the program you qualify for changes your rate and your down payment. See how FHA and conventional loans compare on cost →
5. Does Investing the Difference Actually Win?
Quick Answer: Not at year 15. Investing the $794 monthly gap for 15 years needs an 8.70% annual return just to match the $292,245 the 30-year borrower still owes. At 6% the investing route is $61,442 behind. The strategy only pulls ahead over a full 30 years, and only above roughly 8%.
The standard argument says take the cheap 30-year money, put the difference into index funds, and finish richer. It is reasonable, and it is usually made without running the numbers. Run them at 2026’s narrow rate gap and the margin is thin.
| Assumed annual return | Portfolio at year 15 | Net vs 15-year at year 15 | Net vs 15-year at year 30 |
|---|---|---|---|
| 4% | $195,305 | −$96,939 | −$277,715 |
| 6% | $230,803 | −$61,442 | −$181,910 |
| 8% | $274,627 | −$17,618 | +$17,759 |
| 10% | $328,937 | +$36,692 | +$398,562 |
Modeled scenario, not a forecast. DollarVisor calculations using the Freddie Mac survey rates of August 13, 2026. Year 15 compares the invested $794 monthly gap against the $292,245 balance still owed. Year 30 assumes the 15-year borrower invests the full $3,367 payment in years 16 to 30. Returns are before tax and fees.
Two things drive that result. The gap you invest is small next to the debt it must beat, and the 30-year borrower keeps paying 6.67% on a balance that stays large. Add portfolio taxes and the crossover moves higher still.
The year-30 column is the honest counterweight: given three decades and an 8% return, investing does win. The question is whether you will keep funding it every month for 30 years without touching it.
6. Can You Just Overpay a 30-Year Instead?
Quick Answer: Yes, and it costs less than most people expect. Paying the 15-year amount of $3,367 on a 30-year loan clears it in 16.2 years for $255,935 in interest: $49,913 more than the real 15-year. That premium buys the right to drop back to $2,573 whenever you need to. See how amortization schedules work.
Think of the $49,913 as an insurance premium on your own cash flow: about $260 a month for the right to stop overpaying whenever you need to. For a household with variable income, that option is worth real money.
- Take the 30-year and lock the lower required payment. Your approval, your debt-to-income ratio and your worst-case month are all set by this number.
- Confirm there is no prepayment penalty. Most conforming loans have none, but read the note before you assume it.
- Set up an automatic extra principal payment. Send the difference every month and label it as principal, or the servicer may just apply it to next month’s bill.
- Re-check the balance once a year. If your income has grown, raise the extra payment. If it has not, pause it without penalty and restart later.
One caution: this only works if you actually do it. The plan is mathematically fine and behaviorally fragile, the opposite of the 15-year, where the discipline is enforced by contract.
7. Does Your State Change the Answer?
Quick Answer: Rates do not change by state, but loan sizes do, and that decides whether the 15-year payment is reachable. Most counties in Texas, Florida, Ohio, Michigan, Georgia, North Carolina, Illinois and Pennsylvania use the 2026 baseline limit of $832,750, while coastal California and the New York City metro run to the $1,249,125 ceiling.
A buyer borrowing $250,000 in Ohio faces a $496 monthly premium. A buyer borrowing $650,000 in California faces $1,290. Same decision, same percentages, very different household impact.
The limits come from the Federal Housing Finance Agency’s 2026 announcement, which raised the baseline by $26,250. Cross that limit in your county and you are in jumbo territory, where both terms are priced by individual lenders. In high-cost states the 15-year is often ruled out by payment size long before anyone compares interest totals.
Already own and thinking about tapping equity?
The same show-the-math approach applies when you borrow against a house you already have. Compare a HELOC against a cash-out refinance →
8. Who Should Not Take a 15-Year Mortgage?
Quick Answer: Skip the 15-year in four cases: no emergency fund, no full employer retirement match yet, commission-based or seasonal income, or a move expected within five years. In each one the higher required payment buys savings you will probably never collect.
A 15-year mortgage converts flexible money into locked equity. That is a good trade when your finances are stable and a bad one when they are not, because home equity is the hardest asset to reach in a crisis.
- No cash cushion. Three to six months of expenses comes first. A paid-down mortgage does not cover a job loss.
- Unmatched retirement contributions. An employer match is an immediate return nothing on this page beats.
- Uneven income. If your best month is double your worst, budget from the worst one.
- Short expected stay. Sell in year five and most of the interest saving never happens: you only paid down principal faster, which the sale returns anyway.
- Expensive other debt. Credit card balances cost far more than 6.67%. Clear those first.
If you land in one of these groups the decision is not close. Take the 30-year, build the buffer, and revisit the term at your next refinance decision.
9. The Short Version
Quick Answer: Run the 15-year payment first. If it fits without squeezing savings or retirement, take it: the interest saving is real and investing does not reliably beat it. If it does not fit, take the 30-year and overpay when you can. More head-to-heads sit in our loans coverage.
The choice is usually framed as discipline versus laziness. It is really about certainty. The 15-year hands you a guaranteed 61% cut in interest and takes away a quarter of your borrowing power.
So ask whether the higher payment is comfortable in a bad month, not an average one. If the answer is no, the 30-year with occasional extra payments is not a compromise: it is the right product. The same show-the-math habit applies to every money decision, from mortgages to picking between two travel rewards cards.
10. Frequently Asked Questions
1. Is a 15-year mortgage really worth it?
On a $400,000 loan it saves $320,314 in interest, 61% of the total. That is worth it if the extra $794 a month does not stop you funding retirement or an emergency fund. If it does, the saving is theoretical, because you will refinance or struggle before year 15.
2. How much higher is a 15-year mortgage payment?
About 31% higher at current rates, and that ratio holds at every loan size. A $250,000 loan costs $496 more a month, a $400,000 loan costs $794 more, and a $650,000 loan costs $1,290 more. Check the ratio against your budget before checking the interest totals.
3. Is it better to take a 30-year and invest the difference?
Only with a long horizon and strong returns. Investing the $794 gap needs 8.70% a year just to match the 30-year’s remaining balance at year 15. Over the full 30 years the investing route wins above roughly 8% a year, before tax and fees.
4. Can I pay off a 30-year mortgage in 15 years?
Almost. Paying the 15-year amount of $3,367 on a 30-year loan clears it in 16.2 years for $255,935 in interest: $49,913 more than the real 15-year. You pay that premium for the right to drop back to the lower required payment whenever you need to.
5. Why is the 15-year rate lower than the 30-year rate?
Lenders take back their money in half the time, so they carry less risk that rates move against them. The discount was 0.71 percentage points on August 13, 2026, down from 0.87 points a year earlier. The gap moves week to week and is smaller than most buyers expect.
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This article is for information only and is not financial advice. Mortgage rates and loan terms change often: confirm current details with your lender before you apply. See our disclaimer.