Adjustable-Rate Mortgages: Are They Worth the Risk?

ARMs have a bad reputation thanks to the 2008 housing crisis. But today's ARMs are different — and they make sense in certain situations.

How ARMs actually work

An ARM starts with a fixed rate for a set period, then adjusts periodically based on an index (like SOFR) plus a margin.

Common structures:

• 5/1 ARM: Fixed for 5 years, adjusts annually after that.
• 7/1 ARM: Fixed for 7 years, adjusts annually.
• 10/1 ARM: Fixed for 10 years, adjusts annually.

The upside: lower initial rate

Right now, a 7/1 ARM might be 6.00% while a 30-year fixed is 6.75%. On a $450k loan, that's about $225/month saved.

The risk: rate adjustments

Most ARMs have caps: 2% per adjustment and 5-6% over the life of the loan. So if your starting rate is 6%, the worst case is about 8% after the first adjustment and 11-12% at the lifetime cap.

When ARMs make sense

• You're moving in 5-7 years. Why pay a premium for a 30-year fixed if you won't have the loan that long?
• Rates are high right now. If rates drop, you can refinance before the adjustment kicks in.
• You expect your income to rise. A potentially higher payment later isn't scary if you're in a growing career.

When to avoid ARMs

• You're stretching your budget. If a rate increase would break you, fix the rate.
• Rates are low. Why take the risk when fixed rates are already cheap?
• You plan to stay 10+ years. Eventually the adjustment will come. Fixed is safer.

The takeaway: ARMs aren't evil. They're a bet on your future — that you'll sell, refinance, or handle higher payments before the adjustment. If you can't stomach that bet, take the fixed rate and sleep well.