A 15 year mortgage and a 30 year mortgage can finance the same home, yet they lead to very different financial lives. One builds equity fast and costs far less interest. The other keeps your payment low and leaves more room for savings, investing and surprises. This guide compares both with current rates and real numbers, then walks through the questions a financial planner would ask before you choose.
Quick answer
On a $400,000 loan at late September 2026 average rates, a 15 year mortgage costs about $798 more per month than a 30 year mortgage but saves about $337,000 in interest and is paid off 15 years sooner. Choose the 15 year term if the higher payment still leaves you a full emergency fund and on track with retirement savings. Choose the 30 year term if you want flexibility, and prepay it when you can, which captures much of the interest savings without locking in the higher payment.
What is the real difference between a 15 year and a 30 year mortgage?
Three things change when you shorten the term: the rate, the monthly payment and the total interest. Lenders charge less for shorter loans because their money is at risk for half as long. In Freddie Mac’s Primary Mortgage Market Survey for the week of September 24, 2026, the 30 year fixed rate averaged 7.03% and the 15 year fixed rate averaged 6.42%. The payment still rises, because you repay the same balance in half the time.
| $400,000 loan, principal and interest only | 30 year fixed at 7.03% | 15 year fixed at 6.42% |
|---|---|---|
| Monthly payment | $2,669 | $3,467 |
| Total interest over the full term | $560,939 | $224,035 |
| Total of all payments | $960,939 | $624,035 |
| Loan paid off in | 30 years | 15 years |
The 15 year loan saves roughly $337,000 of interest in exchange for about $798 more each month. Your actual payment will also include property taxes, homeowners insurance and any mortgage insurance or HOA dues, which are the same under either term.
Can you qualify for the higher 15 year payment?
Lenders qualify you on the full payment of the loan you choose, so a 15 year term needs more income for the same loan amount. Fannie Mae’s standard maximum debt to income ratio is 36% for manually underwritten loans, or up to 45% with strong compensating factors, and its Desktop Underwriter system can approve up to 50% when the rest of the file is strong. That ratio includes your new housing payment plus car loans, student loans, minimum card payments and other monthly debts.
Using the $400,000 example with an estimated $700 a month for taxes and insurance and $600 of other monthly debts, a 43% ratio works out to roughly $9,230 of gross monthly income for the 30 year loan and roughly $11,090 for the 15 year loan. If the 15 year payment pushes your ratio near the limit, that is usually a sign it will also feel tight in real life.
Planner’s tip: Qualifying and affording are different tests. Before you choose the shorter term, confirm that the higher payment still leaves room for three to six months of expenses in savings, your full employer retirement match and any near term goals such as tuition or a car.
How fast does each term build equity?
On a 30 year loan, most of each early payment goes to interest. On a 15 year loan, principal takes the larger share from the first month, so your balance falls much faster. That matters if you plan to sell, refinance or tap equity within a few years.
| Balance remaining on $400,000 | 30 year at 7.03% | 15 year at 6.42% | Extra equity with the 15 year |
|---|---|---|---|
| After 5 years | $376,647 | $306,419 | $70,228 |
| After 7 years | $364,759 | $259,751 | $105,008 |
| After 10 years | $343,491 | $177,527 | $165,964 |
Keep in mind that equity is not cash. Money paid into your home can only come back out by selling, refinancing or borrowing against it, and each of those depends on home values, rates and your credit at that time.
Can you get 15 year results with a 30 year mortgage?
Largely, yes. If you take a 30 year loan and voluntarily pay the 15 year amount every month, the $400,000 example is paid off in about 16 years with about $268,800 of total interest. That is about $44,700 more interest than the true 15 year loan, because the 30 year rate is higher, but it keeps your required payment at $2,669. In a tight month, you simply pay the minimum.
Conventional loans sold to Fannie Mae and Freddie Mac cannot carry prepayment penalties, so you can make extra principal payments at any time. Our guide on paying off your mortgage early or investing covers how to decide where extra dollars do the most good.
Not sure which term fits?
David can price both terms side by side and show how each one fits your budget and goals.
Which mortgage term fits your financial plan?
The right term depends less on the interest you save and more on what the payment difference would otherwise do for you. Work through these questions in order.
- Is your safety net in place? Keep three to six months of expenses in cash before committing to a larger required payment.
- Are you capturing your full retirement match? An employer match is an immediate return that extra principal payments cannot beat.
- Do you carry higher rate debt? Credit cards and personal loans usually cost far more than a mortgage and should be paid first.
- How long will you keep the home? If you expect to move within a few years, the faster equity of a 15 year loan matters less than the payment you carry in the meantime.
- When do you want to be mortgage free? If you want the house paid off by retirement and the timeline fits, a 15 year term enforces that discipline automatically.
- How steady is your income? Commission, bonus and self employed income favor the flexibility of the 30 year payment.
Borrowers who answer yes to the first three and want the discipline of a fixed payoff date are usually good candidates for the 15 year term. Everyone else tends to be better served by a 30 year loan with a plan to prepay.
What else affects the price of a 15 year loan?
Loan level price adjustments
Fannie Mae charges loan level price adjustments based on your credit score and loan to value ratio. On purchases and limited cash out refinances, that credit score and loan to value grid applies only to loans with terms longer than 15 years, so a 15 year loan avoids it. Cash out refinances and some other features carry adjustments regardless of term. This is one reason the rate gap between the two terms can be wider for borrowers with lower scores or smaller down payments.
Other terms to consider
Many lenders also offer 10, 20 and 25 year fixed terms. A 20 year loan often lands between the two on both rate and payment and can be a practical compromise when the 15 year payment is just out of reach.
Refinancing later
Some borrowers start with a 30 year loan and refinance into a shorter term once income rises. That can work well, but it depends on future rates and closing costs, so treat it as an option rather than a plan.
Frequently asked questions
Is a 15 year mortgage always cheaper than a 30 year mortgage?
In total interest, yes, because you borrow the money for half as long and usually at a lower rate. In monthly cash flow, no. The 15 year payment is higher, so the cheaper loan is the one whose payment you can carry comfortably while still saving for other goals.
How much higher is a 15 year mortgage payment?
At the late September 2026 average rates, the principal and interest payment on a $400,000 loan is about $3,467 on a 15 year term versus about $2,669 on a 30 year term, a difference of roughly $798 a month. The gap depends on the loan amount and the rates you are offered.
Can I pay off a 30 year mortgage in 15 years?
Yes. Paying extra principal each month shortens the loan. On a 30 year loan at 7.03%, paying the 15 year amount of about $3,467 instead of $2,669 retires a $400,000 balance in about 16 years. Conventional loans sold to Fannie Mae and Freddie Mac have no prepayment penalties.
Is it harder to qualify for a 15 year mortgage?
It can be. Lenders use the full required payment to calculate your debt to income ratio, and the 15 year payment is higher for the same loan amount. Credit, down payment and reserve requirements are generally the same for both terms.
Should retirees choose a 15 year mortgage?
It depends on income, savings and taxes. A shorter term can clear the mortgage before or early in retirement, but a larger required payment funded by retirement account withdrawals can raise your taxable income. Our guide to getting a mortgage in retirement covers how lenders count retirement income and assets.
David Arvidson, MBA, CFP®
Founding partner of ARBOR Financial Group, helping clients finance homes since 1996. MBA, University of Notre Dame. CFP® professional since 2013.
NMLS #298701
DRE #01236224
Licensed in 21 states and DC
Choosing between a 15 and 30 year loan?
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Sources and official resources
Information checked September 27, 2026. Rates, loan limits, tax rules and program guidelines change, so confirm current terms before you rely on them.
This article is for general education only and is not a loan offer, commitment to lend, or individualized investment, tax or legal advice. Rates, terms, fees and programs vary by lender and are subject to change without notice. All loans are subject to credit approval, underwriting guidelines and property eligibility. Examples are illustrations, not quotes or predictions. David Arvidson, NMLS #298701, DRE #01236224. ARBOR Financial Group is a DBA of The Turnkey Foundation Inc., NMLS #236669 (NMLS Consumer Access). Equal Housing Opportunity. CFP® and CERTIFIED FINANCIAL PLANNER® are certification marks owned by Certified Financial Planner Board of Standards, Inc.
