A 15-year conventional mortgage is one of the few financial products where the headline number is genuinely better than the alternative. Rates on 15-year fixed loans typically sit somewhere between half and three-quarters of a percentage point below 30-year rates. On a $350,000 loan, that spread is worth thousands of dollars over the life of the loan.
The rate is the easy part, though. What trips people up is what a shorter term does to the monthly payment, the qualification math, and the flexibility you give up. If you’re shopping right now, here is what actually matters.
What “Conventional” Adds to the Picture
Conventional simply means the loan isn’t backed by a government agency. No FHA mortgage insurance premium, no VA funding fee, no USDA guarantee. It’s a Fannie Mae or Freddie Mac loan, which means it has to fit inside conforming loan limits — $806,550 for a single-family home in most of the country for 2025, higher in expensive counties.
Two things follow from that. Conventional 15-year loans tend to carry stricter credit and debt-to-income requirements than FHA. And once you cross the conforming limit you’re in jumbo territory, where the 15-year pricing advantage often shrinks or vanishes entirely, because jumbo investors don’t price short terms the same way.
Mortgage insurance behaves differently too. Put 20% down on a conventional 15-year loan and there’s no PMI at all. Between 10% and 20% down, PMI applies but usually falls off sooner than on a 30-year loan, simply because you’re paying down principal so quickly.
Where 15-Year Conventional Mortgage Rates Are Landing
The gap between 15-year and 30-year fixed rates has historically run about 0.50% to 0.75%. For a borrower with a 760 credit score, 25% down, and a single-family primary residence, the 15-year quote will usually land below the 30-year quote by roughly that margin. Weaker credit, a condo, or a lower down payment can compress the gap to almost nothing.
Watch out for advertised rates that assume two discount points and a 40% down payment. Those numbers look excellent and apply to almost nobody. If you want a clearer read on why the advertised figure differs from what shows up on your Loan Estimate, this breakdown of the shorter-term math behind current 15-year mortgage rates walks through it line by line.
The Payment Math Nobody Puts in the Ad
Here’s the comparison most people don’t run before they commit. Take a $350,000 loan. A 15-year at 6.50% gives you a principal-and-interest payment of about $3,049. A 30-year at 6.90% gives you about $2,305. Same house, same down payment, a $744 monthly difference.
Now look at the total interest. The 15-year loan costs roughly $199,000 in interest over its life. The 30-year costs about $480,000. That’s a $281,000 gap, and it’s the real reason people stretch for the shorter term.
What the ad never shows is the cash-flow squeeze. An extra $744 a month is $8,928 a year. If your emergency fund is thin or your income has any variability, that payment becomes a monthly test of nerve. There’s a fuller accounting of the real cost of halving your term if you want to see how the trade-off plays out across different loan sizes.
Your Rate Is a Profile, Not a Headline
Two borrowers can call the same lender on the same afternoon and get quotes a full point apart. The variables that move 15-year conventional mortgage rates the most:
- Credit score band. The jump from 680 to 740 is typically worth 0.375% to 0.625% in rate. From 740 to 780, less.
- Loan-to-value. 80% LTV or better unlocks the best pricing. Above 90%, expect a meaningful hit.
- Property type. Condos carry a pricing add-on at many lenders. Two-to-four unit properties add more.
- Occupancy. Investment properties price roughly 0.75% to 1.50% higher than primary residences.
- Loan size. Very small loans (under $150,000) often get worse pricing because the lender’s fixed costs are the same.
- Points. The quote you see may already include a fee you didn’t ask for.
The spread between the best and worst quote on an identical scenario is routinely 0.75%, which on a $350,000 15-year loan is about $150 a month. For more on why the headline figure misleads, see what the average 15-year mortgage rate leaves out.
Points and the Break-Even Question
One discount point costs 1% of the loan amount and typically trims the rate by about 0.25%. On a $350,000 loan, that’s $3,500 to save roughly $48 a month. Divide one by the other and your break-even is about 73 months, or just over six years.
That math gets worse fast on a 15-year loan. Points are amortized over a shorter payoff window, so there’s less time for the savings to compound. If there’s a decent chance you’ll sell or refinance inside five years, paying points on a 15-year is usually a losing bet. Ask the lender for the no-points rate and the one-point rate side by side, then do the division yourself.
Qualifying for a 15-Year Loan Is a Different Test
Lenders qualify you on the payment, not on the rate. Going from $2,305 to $3,049 is a 32% jump in principal and interest. On $9,000 of gross monthly income, your front-end ratio moves from about 26% to about 34%. Once you add taxes, insurance, and any other debts, you’re pushing toward the 43% to 45% back-end ceiling most conventional lenders prefer.
Some lenders will stretch to 50% with strong compensating factors — 12 months of reserves, a long employment history, a big down payment. Cash-out refinances into a 15-year term are stricter still, usually capped around 80% LTV.
When the Shorter Term Makes Sense, and When It Doesn’t
A 15-year conventional loan fits well if you’re already maxing out retirement contributions, you have six months or more of expenses in reserve, your income is stable or rising, and paying the house off before retirement is a real goal rather than a vague preference.
It fits badly if the payment pushes your debt-to-income near the limit, if you’d have to drain savings for the down payment, or if you’re early in a career where a job change might mean a move. The higher payment isn’t reversible without a refinance, and refinancing into a 30-year later means restarting the amortization clock at a higher rate than you might get today.
A Rate Isn’t the Only Way to Shorten the Term
Plenty of borrowers take the 30-year rate and simply pay it like a 15-year. On that same $350,000 loan at 6.90%, paying $3,049 a month retires the debt in about 15 years and 8 months — nearly the same result, with the option to drop back to $2,305 in a bad month.
The catch is discipline and a slightly higher rate. You also lose the forced savings, which is exactly what some people need. A 30-year mortgage rate calculator will show you what extra principal does to your payoff date, and the answer is often closer to the 15-year outcome than people expect.
How to Shop for These Rates Without Wasting Weeks
Rate shopping works on a narrow window. Mortgage inquiries within a 14-to-45 day period (the exact window depends on the scoring model) count as a single credit pull, so the goal is to get three or four lenders quoting the identical scenario inside a few days.
Ask each one for a written Loan Estimate on the same loan amount, same LTV, same lock period, same points. Compare the APR and the total closing costs, not the note rate. A lender quoting 6.375% with $4,800 in fees can easily lose to one quoting 6.50% with $2,100 in fees. The same discipline that applies to shopping for the best 30-year mortgage rate works here — the term changes, the negotiation playbook doesn’t. Ask about lender credits, relationship discounts, and whether the quote assumes a full appraisal or a waiver.
Run Your Own Numbers Before You Commit
Pull up a spreadsheet and put four figures in it: your current or proposed 30-year payment, the 15-year payment you’ve been quoted, the difference between them, and what that difference would earn if you invested it at 6% instead. For a $744 monthly gap over 15 years, that’s roughly $215,000 of invested savings, before taxes — a substantial offset against the $281,000 in interest you’d save.
Then ask the harder question: what happens if you lose your job in month 14? With a 15-year payment, you have less slack. With a 30-year, you can skip the extra principal. That’s not an argument against the shorter term. It’s an argument for choosing it deliberately, with reserves in place, rather than because the rate looked good on a comparison site. Get three quotes, check the break-even on any points, and make sure the payment still works in a month where something goes wrong.