Adjustable-Rate Mortgages Are Back at 10.3% of Applications. Is a 6.43% ARM Worth the Risk Over a 7.40% Fixed Rate?

Mortgage rates have climbed to levels we haven’t seen in almost three years, and buyers are doing what buyers always do when the monthly payment stops fitting: they look for a cheaper way in. Lately that’s the adjustable-rate mortgage, or ARM.

The Mortgage Bankers Association’s latest weekly survey showed ARMs holding at 10.3% of applications for a second straight week, the highest share since October 2025. Freddie Mac reported on October 8 that the average 30-year fixed rate rose to 7.40%, up from 7.28% a week earlier and 6.30% a year ago.

So is the ARM a smart workaround or a trap? Both, depending on who you are. Let’s run the numbers.

An adjustable-rate mortgage has a fixed rate for an introductory period, then the rate changes at set intervals. A 5/1 ARM holds its rate for five years, then adjusts once a year. After the intro period, your rate equals a market index plus a margin the lender sets. When the index goes up, your payment goes up. The Consumer Financial Protection Bureau (CFPB) also points out that many ARMs have caps limiting how much the rate can rise at once and over the life of the loan, but those limits differ from loan to loan.

The appeal is simple. Lenders charge less for the first few years because they’re not locking in your rate for 30.

The MBA put the average 5/1 ARM contract rate at 6.43% in its latest survey, against 7.49% for a conforming 30-year fixed. Freddie Mac’s 7.40% figure is a slightly different measure, but the picture is the same. Here’s what that gap looks like on a $400,000 mortgage, using the 7.40% fixed rate and the 6.43% ARM:

That’s real money. It’s a car payment, or a full year of daycare in some places. But keep reading, because the five-year number is only half the story.

After 60 payments on that ARM, you’d still owe about $374,100. That’s only about $4,000 less than you’d owe on the fixed loan at the same point ($378,100), because at these rates most of your early payments go to interest.

Now say the rate adjusts upward. Here’s the monthly payment on that $374,100 balance with 25 years left:

At 8.43% you’d be paying $226 a month more than the fixed-rate borrower from day one. At 11.43%, you’d be paying over $1,000 more. Your caps decide which of those is even possible, so find them on your Loan Estimate before you fall in love with the intro rate.

Notice the trap here. The ARM saves you about $15,600 over five years, but a reset to 8.43% costs you $485 a month more than the starting payment, and that can erase the savings in about 32 months. That’s the bet. You’re wagering that you’ll be gone, or refinanced, before that happens.

I’d consider one if all three of these are true:

If you’re stretching to qualify and the ARM is the only way the numbers work, stop. That’s the situation the CFPB warns about. Its advice is blunt: don’t assume you’ll sell or refinance before the rate changes, because your home’s value could drop or your finances could shift.

An ARM shouldn’t be your first move. It should be your fourth. Try these first.

Shop lenders. Freddie Mac’s chief economist, Sam Khater, said getting multiple quotes can potentially save borrowers thousands of dollars over the life of the loan. Freddie Mac has also estimated that in a high-rate market, applying with several lenders could save a buyer $600 to $1,200 a year. That’s often the cheapest rate cut you’ll find, and it doesn’t come with reset risk.

Ask about points, too. Paying one point (1% of the loan, or $4,000 on this mortgage) can lower the fixed rate. Whether it pays off depends on how long you’ll keep the loan, so run the break-even before you buy down.

Consider a cheaper house or a bigger down payment. Every $10,000 you don’t borrow at 7.40% saves you about $69 a month. That’s not exciting, but it’s guaranteed.

Look at FHA or VA loans if you qualify. Fortune’s rate tracker showed the 30-year FHA average around 6.90% and VA around 6.99% this week, and the MBA’s FHA contract rate was 7.14%, both below conventional rates. Those loans come with their own mortgage insurance or funding fees, so compare the full cost, not just the rate.

Ask the lender for three numbers in writing: the first adjustment cap, the periodic cap, and the lifetime cap. Then calculate your payment at the lifetime cap rate. If that number makes your stomach drop, walk away. A loan you can only afford if rates cooperate isn’t a loan you want.

If you already have a mortgage and just want to know where you stand, the SuperMoney app can pull your debts, income, and spending into one place so you can see how much room your budget really has before you commit to a bigger payment. It also lets you compare loan offers side by side, which makes the lender-shopping step far less painful.