Adjustable-rate mortgages change over time, unlike fixed loans. They typically begin with a below-market teaser rate, then switch to adjustable after a set window - often five, seven or 10 years - and continue to reset every six or 12 months after that.
ICE Mortgage Technology counts 3.1 million ARMs in circulation, the highest tally in 5.5 years. Of those, 2.05 million are still in their fixed introductory stretch, and 1.05 million have moved into the adjustable stage.
About 150,000 borrowers will see their first adjustment this year, including around 64,000 between August and December, according to data ICE shared. Another 186,000 are due for their first reset in 2027, and 155,000 in 2028.
Once the rate starts floating, periodic resets can move a homeowner's monthly bill up or down. The size of that swing depends on where the loan started and on built-in caps that limit rate moves. A common structure might allow up to a 2 percentage point jump at the first reset, 1 point per reset after that, and no more than 5 points total over the life of the loan.
A minority could catch a break and see their rate and bill shrink.
Take seven-year ARMs originated in 2019 that are hitting their first reset between August and December this year: the median starting rate was 3% and the median unpaid balance is $548,000. Given today's rates and those cap rules, the median adjusted rate pencils out to 6.06%, which works out to a median payment jump of $1,080.
Now contrast that with three-year ARMs from 2023. Those have a median initial rate of 8.38% and a remaining balance of $136,000. ICE estimates their median rate is set to slide to 7.71%, trimming the typical monthly bill by $124.
For extra context, Bankrate pegs the average initial rate on a 5/1 ARM at about 6.65% as of Monday. Mortgage News Daily puts the average 30-year fixed at 7.48% as of Friday.
Adjustable-rate resets hit household budgets on a known schedule. Market Briefs covers housing finance free every weekday.
That letter shows how your rate would change based on current conditions.
If you plan to stay put, your main paths are to keep the ARM or refinance. On a $300,000 mortgage, that is $6,000 to $15,000. You will also want your credit score and history in solid shape.
"Well, unfortunately that scenario happened." Kate Wood, a lending expert with NerdWallet, said: "If you're in a situation where your ARM's adjustments would really stretch you financially, you might be better off refinancing for the certainty of a fixed-rate loan even if the savings wouldn't be substantial." She added: "If you're financially capable of riding out the adjustable period and you have enough of an appetite for risk, keeping the ARM is always an option."
"Some people are fine. "But other people can't say that."
If you are worried about affording the new bill, the CFPB points to housing counselors with the Department of Housing and Urban Development. They can help you figure out how to request a loan modification or other repayment plan from your lender.
If your teaser period is ending, expect two letters before your first adjusted payment - one about seven to eight months out with a projection, and one 60 to 120 days out with the actual numbers. Your starting rate and any caps, like a 2-point first reset or a 5-point lifetime limit, will shape where your payment lands against today's higher-rate backdrop.
If you are unsure you can carry the new payment, HUD-approved counselors can walk you through options with your servicer.
Knowing when the reset lands is half of planning for it. Join Market Briefs free and follow it.
