How ARMs Actually Work and When One Makes Sense

Adjustable-rate mortgages have a reputation that scares many buyers away. The idea of a fluctuating monthly payment sounds risky compared to the safety of a fixed rate. However, when used correctly, an ARM is a strategic financial tool that can save you thousands in interest.

The Anatomy of an ARM

An ARM has two distinct parts. It begins with an introductory period with a fixed rate, followed by a period where the rate adjusts periodically. Common ARM types are named by their structure, such as 5/1, 7/1, or 10/6. The first number is the years the rate stays fixed. The second number is how often it can adjust afterward, where 1 means annually and 6 means every six months. For example, a 7/1 ARM has a 7-year fixed period then adjusts once a year

Rate Caps and Payment Changes

You do not have to worry about your rate skyrocketing infinitely overnight. ARMs have rate caps that limit both the maximum increase per adjustment and the maximum increase over the life of the loan. While these caps provide safety, your payments can absolutely increase if rates rise after the fixed period ends.

When an ARM Makes Sense

ARMs typically start with a lower rate than a comparable fixed-rate loan. This can mean massive savings if rates stay flat or drop. An ARM makes the most sense for buyers with a short hold period who plan to sell the home or refinance the loan before the initial fixed period ever expires.

Talk to a Loan Officer at our Mortgage Brokerage to see if an ARM aligns with your future plans. We can help you compare ARM options against standard fixed rates.

Expect to close one week early.

Frequently Asked Questions

What does a 5/1 or 7/1 ARM mean?

The first number is how many years the rate is fixed. The second number is how often it adjusts afterward. A 5/1 ARM is fixed for 5 years and then adjusts annually.

Can my payment go up on an adjustable-rate mortgage?

Yes. Once the introductory fixed period ends, your interest rate and monthly payment can increase depending on current market index rates.

Is there a limit to how much an ARM rate can increase?

Yes. ARMs have specific rate caps that restrict how much the rate can increase during a single adjustment period and over the total life of the loan.

When does an ARM actually make sense over a fixed rate?

An ARM is ideal if you plan to sell the home or refinance the mortgage before the introductory fixed-rate period ends.