15-year vs. 30-year mortgage comparison: payments, rates and total cost

Q: How much lower is a 15-year mortgage rate?

Fifteen-year fixed rates typically price meaningfully below 30-year fixed rates because the lender carries interest-rate risk for half as long. The exact spread moves with market conditions and shows up weekly in Freddie Mac's rate survey. Combined with the shorter term, that lower rate is why total interest on a 15-year loan is often less than half the 30-year figure.

Written by Samantha SheltonNMLS 1647301Updated October 2026

Couple comparing loan terms at their dining table, weighing a 15-year vs. 30-year mortgage

A 15-year mortgage costs far less over the life of the loan, but the monthly payment runs roughly 40% higher than the same loan on a 30-year term. On a $240,000 loan at 6%, the 15-year payment is about $2,025 a month and the 30-year payment is about $1,439, a difference of about $586 a month that buys roughly $153,000 in lifetime interest savings.¹

Those two payments hold the rate at 6% on both terms, which isolates the variable that actually separates them: time. In the real market the 15-year fixed typically prices below the 30-year fixed, so the true gap in total interest is usually wider than the example shows. Freddie Mac has published a 30-year fixed-rate average since April 1971 and added a 15-year fixed-rate series in 1991; both are updated weekly, Thursdays at noon Eastern.

Learn how a 15-year vs. 30-year mortgage comparison actually works. What each term does to your monthly payment, your total interest, your equity and your borrowing power, and what happens if you take the 30-year and prepay it instead. If you’re still deciding among programs, start with our Loan Types & Programs guide.

Key takeaways:

The 15-year term saves interest, not monthly cash: On a $240,000 loan at 6% it cuts total interest from about $278,012 to about $124,546, a difference of about $153,466, while costing about $586 more every month.
The 30-year term buys borrowing power: At the same income and the same 50% debt-to-income ceiling, the lower payment can support roughly $500,000 of loan amount versus roughly $355,000 on a 15-year term.
Prepaying a 30-year closes part of the gap, not all of it: Adding $200 a month to a $1,439 payment retires the loan in about 22 years instead of 30 and saves roughly $85,000 in interest.

How do 15-year and 30-year mortgages differ?

They differ in one input, the number of months you have to repay, and that single input drives every other difference. A 15-year fixed-rate mortgage amortizes over 180 payments; a 30-year fixed-rate mortgage amortizes over 360. Squeeze the same $240,000 into half the payments and the monthly amount rises about 41%, from roughly $1,439 to roughly $2,025.

Both are fixed-rate loans, so both behave the same way month to month. As the CFPB puts it, on a fixed-rate loan the combined principal and interest payment does not change over the life of your loan, but the amounts that go to principal rather than interest do change. Early on you owe more interest because the balance is still high; later, most of the payment goes to retiring the last of the principal. That’s how amortization works, from the CFPB.

The shorter term compresses that curve. On the 15-year loan, a much larger slice of every payment attacks principal from month one, which is why equity builds so much faster. Our breakdown of fixed-rate mortgage options covers the full menu of terms, including the 20-year and 10-year loans that sit between these two.

One more structural difference: the 15-year carries less interest-rate risk for whoever holds the loan, because the money comes back in half the time. Lenders price that shorter risk window at a discount, which is the reason 15-year rates sit below 30-year rates in the Freddie Mac survey of 15-year and 30-year fixed rates week after week. Neither term is inherently safer for you. Both lock your rate for the life of the loan, which is the core advantage covered in fixed-rate mortgages: benefits and drawbacks.

15-year vs. 30-year mortgage: the numbers side by side

Here is the same $240,000 loan at the same 6% rate, run both ways. Every figure below comes from standard amortization math on that one scenario, so the columns are directly comparable.

Feature	15-year fixed	30-year fixed
Monthly principal and interest	About $2,025	About $1,439
Interest rate	Historically prices below the 30-year in Freddie Mac’s weekly survey	The benchmark rate; held at 6% here so the comparison isolates term
Total interest over the life of the loan	About $124,546	About $278,012
Equity built after 5 years (principal only)	About $57,600 paid down; balance about $182,400	About $16,700 paid down; balance about $223,300
Maximum loan at the same income	About $355,000	About $500,000

Three rows deserve a second look. Total interest is where the headline lives: $153,466 is not a rounding difference, it’s most of a second down payment. Equity at year five is the quiet one. The 15-year borrower has retired about $40,900 more principal, which is real net worth, not a projection. And maximum loan amount is the row that decides the question for a lot of buyers before preference ever enters into it.

Remember that the interest-rate row is deliberately neutralized. Because 15-year loans genuinely price lower, a real side-by-side quote usually shows the 15-year saving more than $153,466. Rates move weekly, so the only honest way to see today’s spread is to pull both quotes at once.

How does the term affect how much house you can buy?

The 15-year term cuts your maximum loan amount by roughly 29% at the same income, because lenders qualify you on the payment, not the balance. A payment that’s $586 higher consumes $586 more of your allowable debt load, and the loan amount shrinks to match.

Here’s the arithmetic on a household earning $8,000 a month with $500 in other monthly debt payments, using a 50% debt-to-income ceiling and budgeting $500 a month for taxes and insurance. That leaves $3,000 a month for principal and interest. At 6%, $3,000 a month supports about $500,375 on a 30-year term and about $355,511 on a 15-year term, a difference of roughly $145,000 in purchasing power.

The ceiling itself is set by the loan program, and the number depends on how the file is underwritten. Fannie Mae caps total DTI at 36% of stable monthly income on manually underwritten loans, and that maximum can be exceeded up to 45% when the borrower meets the credit score and reserve requirements in the Eligibility Matrix. For loan casefiles underwritten through Desktop Underwriter, the maximum allowable DTI ratio is 50%. Those are conventional guidelines; other programs set their own. Our guide to conventional loans walks through the qualifying rules in detail.

The practical rule: if you’re stretching to reach a price point, the 30-year isn’t a preference, it’s a requirement. If you’re comfortably inside your budget, both terms are genuinely on the table and the decision becomes a real choice.

What if I take the 30-year and prepay?

You get most of the benefit and keep the flexibility, but you don’t get all of it. Prepaying a 30-year loan changes your payoff date and your total interest; it does not change your rate, and it does not lower the payment your lender can require next month if things go wrong.

Run it on the same $240,000 loan at 6%:

Add $200 a month: The payment goes from about $1,439 to about $1,639, the loan retires in about 264 months, roughly 22 years instead of 30, and total interest drops from about $278,012 to about $192,900. That’s about $85,000 saved and eight years off the clock.
Add the full $586 difference: Paying $2,025 a month on the 30-year loan retires it in exactly 180 months with exactly $124,546 in interest. Identical to the 15-year loan, because at the same rate the math is the same.
What prepaying can’t fix: The rate. If the 15-year had been quoted lower, the prepaid 30-year still pays the higher rate for every one of those 180 months, and the 15-year keeps a permanent edge.
What prepaying does protect: Your required payment stays $1,439. In a layoff or a bad year you simply stop the extra, which is a safety valve the 15-year borrower does not have.

Check one thing before you count on this strategy. Not all mortgages have a prepayment penalty, and where one exists it typically applies only if you pay off the entire balance, by selling or refinancing, within a specific number of years, usually three or five. Penalties do not normally apply when you pay extra principal in small chunks at a time. Read the CFPB explainer on prepayment penalties and confirm with your lender before closing.

The honest verdict: prepaying works, and it works only if you actually do it for 15 straight years. If you know you won’t, the 15-year loan enforces the decision for you. If you’d rather commit later once your income is steadier, refinancing to a shorter loan term is the formal version of the same move.

How to choose your mortgage term

Three questions settle it for most borrowers, and the first one is disqualifying: if the 15-year payment doesn’t fit, the other two don’t matter.

Which term fits your budget?

The test is whether the higher payment fits with room left over, not whether it fits on paper. On our example loan the 15-year costs $586 more a month. About $7,032 a year that is committed, not optional.

Rule of thumb: take the 15-year only if you could still fund your emergency savings and your retirement contributions after making that payment. A borrower who lands at 45% DTI on a 15-year and 32% on a 30-year has technically qualified for both and can comfortably afford one.

Which term fits your timeline?

The 15-year rewards borrowers who will hold the loan; the 30-year protects borrowers who won’t. Interest savings accumulate over the full term, so a buyer who sells or refinances in year four captures only a small slice of that $153,466. Though they do walk away with roughly $40,900 more equity at year five, which is not nothing.

Rule of thumb: if you expect to keep the home and the loan for at least seven to ten years, the 15-year’s advantage is worth the payment. If you’re likely to move sooner, the flexibility of the lower payment usually wins.

Which term fits your other goals?

Compare the 15-year against what else that $586 a month could do. A borrower with an employer match left on the table, high-rate credit card debt, or no cash reserve almost always gets more from those uses than from accelerating a 6% mortgage.

Retirement timing: Borrowers who want the mortgage gone before they stop working often pick the term by counting backward from a retirement date rather than by comparing interest.
The tax angle is smaller than most people assume: Mortgage interest is deductible only if you itemize on Schedule A, and the deduction is capped at interest on $750,000 of home acquisition debt ($375,000 if married filing separately) for debt incurred after December 15, 2017. Debt taken on between October 14, 1987 and December 15, 2017 keeps the older $1 million cap. Paying an extra $153,466 in interest to recover a fraction of it at your tax rate is not a strategy.²
Rate structure is a separate decision: Term and rate type are two different levers. If you’re also weighing an adjustable-rate loan, see fixed- vs. adjustable-rate mortgage (ARM): what’s the difference? and our adjustable rate mortgage tips before you combine the two.

Rule of thumb: fund the match, clear high-rate debt, and build three to six months of reserves first. A 15-year mortgage is a good use of surplus money, not a substitute for the basics. Our overview of fixed and adjustable structures shows where term fits in the larger set of choices.

How Align compares fixed and adjustable

Samantha prices a fixed rate and an adjustable rate side by side, across multiple wholesale lenders, and she starts with how long you expect to keep the loan. That one answer decides more than the rate does.

Comparing offers pays. In late 2022, Freddie Mac found borrowers who got two quotes could have saved as much as $600 a year, and four or more quotes more than $1,200 a year.

Align is paid by the lender, not by a fee you pay us, and federal rules bar a broker's pay from changing with your rate or fees.

15-year fixed mortgages

Sources: Freddie Mac, When rates are higher, borrowers who shop around save (February 2023); Regulation Z, 12 CFR 1026.36(d).

FAQ: 15-year vs. 30-year mortgages

Here are answers to common questions about 15-year and 30-year mortgage terms.

Is it better to take a 30-year mortgage and pay extra?

It’s the flexible choice. You keep the lower required payment as a safety net and can direct extra dollars to principal whenever cash allows, shortening the term voluntarily. The trade-off is a higher interest rate than a true 15-year loan and the discipline required to actually make the extra payments. If you’d like the commitment enforced, take the 15. Our look at fixed-rate mortgages: benefits and drawbacks covers why that flexibility is the fixed 30-year’s defining feature.

How much lower is a 15-year mortgage rate?

Fifteen-year fixed rates typically price below 30-year fixed rates because the lender carries interest-rate risk for half as long. The exact spread moves with market conditions and is published weekly in Freddie Mac’s rate survey, which has reported both series side by side since 1991. Combined with the shorter term, that lower rate is why total interest on a 15-year loan often lands at less than half the 30-year figure. Compare the full menu in fixed-rate mortgage options.

Can I switch from a 30-year to a 15-year mortgage later?

Yes, by refinancing into a 15-year loan, which resets the term and typically lowers your rate. Weigh the closing costs against the interest saved and make sure the higher payment fits your budget permanently. Some borrowers instead refinance to a 20-year term as a middle path, or simply prepay principal on their existing loan with no closing costs at all. See refinancing to a shorter loan term for the break-even math.

Does a 15-year mortgage reduce how much house I can buy?

Usually yes. Lenders qualify you on the payment, so the higher 15-year payment consumes more of your allowable debt-to-income ratio and lowers your maximum loan amount at the same income, roughly $355,000 versus $500,000 in our example. Buyers stretching to reach a price point almost always need the 30-year term; buyers well within budget can often afford either. The qualifying ratios are set by program, as our guide to conventional loans explains.

The bottom line on 15-year vs. 30-year mortgages

A 15-year mortgage saves interest; a 30-year mortgage buys flexibility. On a $240,000 loan at 6%, the 15-year payment is about $2,025 versus about $1,439 on the 30-year, about $586 more a month, and it cuts total interest from about $278,012 to about $124,546, a difference of about $153,466. The 15-year also builds roughly $40,900 more equity in the first five years. The cost is borrowing power: at the same income, the 30-year supports roughly $500,000 of loan versus roughly $355,000. Choose the term your budget can carry through a bad year, not the one that looks best in a spreadsheet.

If you’re ready to compare both terms with real pricing, talk to Align Lending, we’ll shop your scenario across our lender network and put the 15-year and 30-year numbers in front of you side by side. Call 248-506-5727 or start online today.

Footnotes:

1. Example figures in this article are hypothetical and for educational purposes only; they do not constitute an advertisement of credit terms or a rate quote under federal or state lending laws. The 6% rate is an illustrative round number chosen to make the two terms comparable, not a quoted or predicted rate. Your rate, payment and total interest will depend on your application, your loan program and market conditions at the time you lock. Return to text.

2. This is general information, not tax advice. Whether mortgage interest reduces your tax bill depends on your individual circumstances, on whether your itemized deductions exceed your standard deduction, and on limits that change with legislation. Consult a qualified tax professional about your situation. Return to text.

Sources: monthly payments, total interest, remaining balances, principal paid and maximum supportable loan amounts computed by standard fixed-rate amortization on a $240,000 loan at a 6% annual rate over 180 and 360 monthly payments. Fixed-rate payments stay level while the split between principal and interest shifts over the loan’s life, and interest is higher early because the balance is higher, Consumer Financial Protection Bureau, “How does paying down a mortgage work?” Prepayment penalties are not present on all mortgages, typically apply only to a full payoff within a set number of years (usually three or five), and do not normally apply to small extra principal payments, Consumer Financial Protection Bureau, “What is a prepayment penalty?” Weekly publication of the 30-year and 15-year fixed-rate averages, release each Thursday at 12 p.m. ET, the survey’s start in April 1971, and the addition of the 15-year series in 1991, Freddie Mac Primary Mortgage Market Survey. Maximum total debt-to-income ratio of 36% on manually underwritten loans, exceedable up to 45% with the credit score and reserve requirements in the Eligibility Matrix, and a maximum allowable DTI ratio of 50% for loan casefiles underwritten through Desktop Underwriter, Fannie Mae Selling Guide B3-6-02. Home mortgage interest deductible only by taxpayers who itemize on Schedule A, the $750,000 ($375,000 if married filing separately) limit on home acquisition debt incurred after December 15, 2017, and the $1 million ($500,000 if married filing separately) limit on debt incurred between October 14, 1987 and December 15, 2017, IRS Publication 936.

This article is for informational purposes only and is not intended to provide legal, financial, or tax advice. Interest rates, qualifying guidelines, program limits and tax rules change and vary by lender, loan program and borrower; confirm your figures with your Loan Estimate and consult a qualified professional about your situation. Figures shown are illustrative, are not a rate quote or an offer of credit, and are subject to change. Align Lending is an independent Michigan mortgage broker, NMLS #2041154.