The Quick Read: The shorter term costs less interest in total, but only if you can carry its higher payment for the whole term. Pick the 15-year when the payment fits comfortably after your other debts and savings goals. Pick the 20-year when it would stretch you, or when the debt-to-income ratio (DTI) puts the 15-year out of reach. Subject to lender guidelines and full file review, the budget test below settles it.
Key Takeaways
- A 15-year refinance usually costs less in total interest. It also carries the higher required payment.
- A 20-year sits between the 15-year and the 30-year. Its payment is lower than the 15-year’s, and it costs more interest in total.
- DTI is the gate. A payment that fails the ratio at 15 years may pass at 20.
- Shortening the term only helps if you keep the loan long enough and never miss a payment.
- A 20-year loan plus extra principal can copy a 15-year, and you can stop the extra whenever you need to.
What Are You Actually Choosing Between?
You are choosing how many years to repay, and how much monthly payment you can carry to get there.
Refinance savings and break-even estimate
The starting figures are an example value with a balance in proportion and a placeholder for costs. Replace them with yours, and enter the current rate from your statement.
Editable benchmark: 7.32% as of October 22, 2026 · Freddie Mac 30-year average via FRED®. A conventional market reference, not a refinance quote.
Illustrative starting assumptions: a $350,000 home value, a $245,000 current balance, a current rate you enter and a remaining term seeded at twenty-five years, closing costs seeded at $5,000 as an editable placeholder (not a fee quote) and rolled into the new loan, a thirty-year term at the current Freddie Mac benchmark, and property taxes and insurance estimated at typical national rates. Every field is editable.
Illustrative estimate only — not a Loan Estimate, approval, quote, or commitment to lend. The new rate field carries the weekly Freddie Mac thirty-year conventional benchmark, a market reference and not a refinance quote; a refinance is priced by the lender at lock, and the current rate, the remaining term and the closing costs are figures you enter. The current payment is estimated from the balance, the current rate and the remaining term; the break-even divides the closing costs by the monthly saving and ignores the interest effect of a longer term. On the VA IRRRL the funding fee is added to the loan unless the veteran is exempt. Taxes and insurance are editable estimates. Licensed in sixteen states for consumer mortgages; Lendmire is a broker, never the lender.
The CFPB's loan-term comparison lists the shorter term as having higher monthly payments, typically lower interest rates and lower total cost. The longer term runs the other way. The CFPB gives two reasons the shorter term saves money: you borrow for fewer years, and the rate is usually lower, by as much as a full percentage point.
The 20-year isn't in that table. It's the middle step, and the same logic applies, just with smaller differences.
| Factor | 15-Year | 20-Year |
|---|---|---|
| Required monthly payment | Higher | Lower than the 15 |
| Total interest over the loan | Lower | Higher than the 15 |
| Pace of equity building | Fastest | Fast, but slower than the 15 |
| Pressure on DTI | Most | Less |
| Room if income dips | Least | More |
| Availability | Common | Offered by fewer lenders, so shop |
The payment you see covers principal and interest. On a fixed-rate loan those stay the same for the whole term. Your total monthly bill can still move when property taxes, homeowner's insurance or mortgage insurance change.
Start With the Budget, Not the Interest Savings
Set your payment ceiling first. Then see which term fits under it. Most borrowers do this backward, chase the lowest total interest, and end up with a payment that squeezes everything else.
Here is the test, in order:
1. List what is already committed. Add your current housing costs, taxes, insurance, car payments, student loans, minimum card payments and child care. Those don't shrink because the mortgage changed.
2. Set a savings floor you won't touch. Decide your emergency fund target and your retirement contribution before you look at the new payment. If the 15-year only works by cutting those, it doesn't work.
3. Stress the income. Ask what happens if household income drops. Think one earner out of work for a stretch, or a commission month that comes in light. Would the 15-year payment still be payable from savings and the other income?
4. Check what's coming. Tuition, a roof, a second child, a car that is near the end of its life. Known expenses in the next several years belong in the test.
5. Compare the two payments against that ceiling. If both fit, the choice is about preference. If only the 20-year fits, you have your answer.
The reason this order works: a mortgage payment is a fixed obligation. Interest savings are a result. You get the savings only if the payment never causes a missed month or a high-rate balance on a credit card.
How Underwriting Treats the Higher Payment
The shorter term raises principal and interest, and that feeds straight into your DTI. The ratio is your new mortgage payment plus other long-term and significant short-term monthly debts, divided by gross monthly income.
Fannie Mae's Selling Guide sets the maximum DTI for loans run through its automated underwriting at 50%. A manually underwritten loan that is re-run after new debt appears becomes ineligible above 45%. Across the wholesale programs Lendmire places files with, the automated finding governs most files, with a total ratio ceiling of 50%. Manually underwritten loans run at 36% or 45%, with reserve and score factors that come from the eligibility matrix.
Here is where the two terms split in practice. Say a household sits near the ratio ceiling on the 20-year payment. The 15-year payment is higher, so the same household may fail the ratio at 15 years and pass at 20. That is not a judgment about the borrower. It is arithmetic. In that case the 20-year isn't just the comfortable choice, it's the only one the file supports.
The same file also has to clear credit and leverage. The wholesale conventional programs start at a 620 decision score, and 640 on an adjustable rate under manual underwriting, subject to lender guidelines. Neither changes between a 15- and 20-year term. Only the payment does.
Does Leverage Change With the Term?
No. Term length doesn't change loan-to-value. The limits are tested against the appraised value.
For a rate-and-term refinance, also called a limited cash-out refinance, the envelope is 95% LTV on a one-unit principal residence. It goes to 97% where the existing loan is agency-owned and the first-time-buyer program allows. Fannie Mae's eligibility matrix shows the same 97% ceiling for a fixed-rate one-unit principal residence and sets lower limits for second homes and larger buildings. Occupancy decides leverage, so a second home or rental tops out lower than a home you live in. Each figure is subject to lender guidelines and a complete review of property type, leverage, and credit.
Mortgage insurance applies above 80% LTV. You can request cancellation at 80% of the original value with good payment history, no subordinate liens and no decline in value. The servicer must end it automatically at 78%. Leverage, reserves, and pricing vary by lender and program; the final terms follow the full file review.
This matters for the term choice. A faster payoff reaches 80% sooner, so the mortgage insurance drops off earlier on a 15-year than a 20-year. If your LTV is high, that is a real point in the 15's favor, though it doesn't override the budget test.
With a rate-and-term refinance, the new loan pays off the existing first mortgage, the closing costs and a purchase-money second lien. Only incidental cash comes back. If you want real cash out while shortening the term, that is a different transaction. Cash-out on a one-unit principal residence caps at 80% LTV. Terms vary by lender guidelines, property type, leverage, credit profile, and full file review.
Remaining Years Matter More Than the Original Term
Measure the new term against the years you have left, not against the original loan.
Take a homeowner ten years into a 30-year loan, with twenty years left. A 20-year refinance doesn't shorten the payoff at all. It resets the clock to the same finish line, usually with new closing costs. The 15-year does shorten it, by five years. Then the question becomes: is a payment that rises to buy five years worth it?
Now take a homeowner two years in, with twenty-eight left. The 20-year cuts eight years. The 15-year cuts thirteen. Either one is a real shortening, and the 20-year may cut enough while keeping the payment manageable.
Lendmire's piece Does a 20-Year or 15-Year Refinance Restart Your 30-Year Clock? walks through that restart question in more detail.
The Break-Even Is Different When the Term Shrinks
The usual break-even math divides closing costs by monthly savings from a lower rate. That works when the payment falls.
When you shorten the term, the payment often rises. There may be no monthly savings to break even against. So judge it differently: compare total interest saved over the years you actually expect to keep the loan, against the closing costs you pay to get there.
Two practical points:
- Costs can often be rolled into the new loan, but rolling them in raises the balance and therefore the payment.
- If you plan to sell in a few years, the interest saved over a short holding period may not cover the costs of refinancing at all.
Closing costs depend on the lender, the loan type and where the home is. Ask each lender for a Loan Estimate on the same term so the comparison is fair, and compare the total loan costs and the total interest percentage, not just the payment.
The Hybrid: 20-Year Plus Extra Principal
A 20-year loan with a voluntary extra principal payment each month can pay off close to the 15-year schedule. The difference is that the extra is optional.
| Factor | 15-Year | 20-Year + Extra Principal |
|---|---|---|
| Required payment | Higher, fixed | Lower, fixed |
| Extra payment | None needed | Your choice, any month |
| Payoff pace | Set by the loan | Set by your discipline |
| If income dips | Full payment still due | Drop the extra, pay the lower required payment |
| Interest outcome | Lower rate, shorter term | Slightly higher rate, so a bit more interest |
You give up a little. The 20-year term usually carries a slightly higher rate than the 15, so even matching the 15-year schedule costs a bit more interest. What you buy is the ability to stop paying extra in a bad month without a missed payment. For a household with variable income, that flexibility is often worth the small cost.
One catch: extra payments only work if you make them. If the extra gets spent on other things, you end up with the 20-year payoff and the 20-year interest. Set it up as an automatic transfer on payment day.
Check that the loan has no prepayment penalty before you plan on it.
Where the General Rule Breaks
The budget test and DTI gate cover most conventional files. A few cases work differently.
VA loans. The VA interest rate reduction refinance loan (IRRRL) refinances an existing VA loan, generally to a lower rate and a lower principal and interest payment. The VA's pamphlet on refinancing frames it that way. The program carries a 0.5% funding fee unless exempt, no VA appraisal and a net tangible benefit test. Because the loan is built around a lower payment, a term that raises the payment is harder to structure. A 15-year IRRRL is the harder one, and a 20-year is usually easier. Lendmire's piece Should You Refinance a VA Loan to a 15-Year or Prepay? covers that choice.
FHA Streamline. An FHA Streamline refinances an existing FHA loan with no appraisal, limited credit review and a net tangible benefit requirement. FHA has specific net-tangible-benefit rules for shortening the term, and the program parameters control the outcome. Ask for the rule as it applies to your file before assuming a shorter term qualifies.
Second homes and rentals. Occupancy sets the leverage limits. A second home or rental sits below the principal-residence limits.
Names on title. At least one borrower on a conventional rate-and-term refinance generally has to own the property at application, with exceptions such as inheritance or a divorce decree.
Leftover second liens. A subordinate lien that stays in place has to be clearly subordinate to the new loan.
Which Term Fits Which Household?
- Stable income, a full emergency fund, retirement on track: the 15-year fits, and its lower total interest is real savings.
- Variable or commission income: the 20-year, or the 20-year plus extra principal. The required payment is the one you must hit in the worst month.
- Tight DTI: the 20-year may be the only one that passes the ratio.
- Approaching retirement: weigh carefully. A 15-year can finish the mortgage before income drops, but only if the higher payment doesn't drain retirement saving.
- Big expense ahead, such as tuition: keep the lower required payment and add extra principal after the expense passes.
- Planning to sell soon: the interest saved may not cover closing costs, so a refinance of either term may not pay off.
This is the honest limit of the whole exercise. Sometimes the right answer is a longer term, or no refinance at all.
Common Mistakes
- Choosing on total interest alone. Savings you can't afford to collect aren't savings.
- Assuming a fixed rate fixes the whole payment. Taxes, insurance and mortgage insurance still move.
- Comparing payments only. The Loan Estimate also shows total loan costs, the APR and the total interest percentage.
- Skipping the income stress test. The 15-year payment doesn't shrink in a lean year.
- Forgetting that the 20-year is less common. Not every lender offers it, so get quotes from at least three.
- Treating DTI as one fixed number. DTI limits are set by each program and lender, and a 43% DTI is a commonly referenced benchmark rather than a universal cutoff, so confirm which limit applies to your loan.
Key Terms Defined
DTI (debt-to-income ratio): Your monthly debt payments, including the new mortgage, divided by your gross monthly income.
Rate-and-term refinance: A refinance that pays off the current first mortgage and closing costs, with only incidental cash back.
LTV (loan-to-value): The loan balance divided by the appraised value of the home.
IRRRL: The VA's streamline refinance for an existing VA loan.
Net tangible benefit: A test that a streamline refinance has to give the borrower a real, measurable gain.
Loan Estimate: The standard form a lender gives you after application that shows the loan terms and costs.
Frequently Asked Questions
Does a 15-year always cost less interest than a 20-year?
Almost always, in total, because you borrow for fewer years and the rate is typically lower. But it only saves money if you carry the payment to the end and keep the loan long enough. A missed payment or high-interest debt taken on to cover the gap can wipe out the savings.
How do I know if I can carry the 15-year payment?
Run the budget test: subtract committed debts and your savings floor from income, then check whether the payment still fits after a one-income-down stress case. Then check DTI, since the lender will. If the payment only fits by cutting your emergency fund or retirement saving, it is too high.
Can I take the 20-year now and shorten later?
Yes, in two ways. You can pay extra principal at any time, with no new loan. Or you can refinance again to a shorter term, which brings new closing costs and a new underwriting review. Extra principal is usually the cheaper route.
Is a 20-year harder to get than a 15-year?
It can be. Fewer lenders list it, so the quotes you collect may be fewer. Lendmire arranges these loans through wholesale lenders, and a broker can compare which lenders offer the term, subject to lender guidelines.
What if my income drops after I refinance?
The required payment doesn't change. On a 15-year there is no lower payment to fall back to. On a 20-year, or a 20-year plus extra, you can stop the extra and pay only the required amount. That is the main reason to choose the longer term when income varies.
Next Step
If you are weighing a refinance and want the break-even run on your own numbers, Lendmire can help you compare the refinance programs on the same home. Bring your current balance, remaining years, monthly debts and the savings you won't touch, and the choice between 15 and 20 years usually becomes clear.
For your own numbers, request a scenario review with Lendmire.
About Lendmire
Lendmire is a mortgage brokerage (NMLS# 2371349) licensed for consumer mortgage lending in 16 states, arranging FHA, VA, conventional and jumbo purchase and refinance loans through a wholesale lending network. Eligibility is determined by the lender on each file. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.
Get Started
Ready to find the right loan for you?
In about 30 seconds you can review financing options available for your home or investment property. No commitment required.
Informational only. Not a Loan Estimate, approval, or commitment to lend. Program availability and eligibility are subject to lender guidelines, credit approval, property review, and underwriting.
References
1. CFPB – Understand the different kinds of loans
2. Fannie Mae Selling Guide B3-6-02
3. Fannie Mae Eligibility Matrix
4. VA Pamphlet VAP26-7, Chapter 6: Refinancing Loans
This article is part of Lendmire’s Refinance series — every loan program’s qualification details, guidelines, and scenarios live on the loan options page.
Related reading: Term Loan vs. 30-Year Cash-Out Refinance for a Pool You Plan to Hold · Should You Refinance to a Shorter Term or Keep the 30-Year? · Can a Homeowner Refinance Inside the First Year of a New Loan?
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
- Mortgage Loan Originator · NMLS# 1129696 · Verify on NMLS Consumer Access
- North Carolina Real Estate Broker · License# 343312 · Verify on NCREC
- North Carolina Insurance Producer · License# 19053198 · Property, Casualty, Life, Health · Verify on NAIC SBS
- Lendmire LLC · Firm NMLS# 2371349 · Verify firm licensure
Compliance and disclosures. Lendmire (NMLS# 2371349) is a licensed mortgage broker and is not a direct lender, depository institution, financial advisor, or tax professional. Content in this article is general market analysis and educational information — not financial, legal, or tax advice for any specific situation. Lendmire does not guarantee loan approval; every transaction is subject to underwriting by the funding lender. Mortgage pricing and loan program guidelines are subject to change at any time without notice and vary by borrower characteristics, property type, and state regulations. Lendmire complies with Equal Housing Opportunity. Licensure verification: NMLS Consumer Access.