ARM vs Fixed Rate: Which Is Better?
An Adjustable-Rate Mortgage (ARM) starts with a lower interest rate for a fixed period (typically 5, 7, or 10 years), then adjusts periodically based on market conditions. A Fixed-Rate Mortgage locks in the same rate for the entire loan term, providing payment predictability.
ARMs are described as 5/1, 7/1, or 10/1, where the first number is the fixed-rate period in years and the second is how often the rate adjusts afterward (annually). A 5/1 ARM has a fixed rate for 5 years, then adjusts every year.
ARMs have rate caps that limit how much the rate can change: the periodic cap limits each adjustment (typically 2%), the lifetime cap limits total increase over the initial rate (typically 5-6%), and the initial adjustment cap limits the first adjustment after the fixed period.
Choose an ARM if you plan to sell or refinance before the fixed period ends, as you will benefit from the lower initial rate. Choose fixed if you plan to stay long-term and value payment predictability over potential savings.
Frequently Asked Questions
What is a 5/1 ARM?
A 5/1 ARM is an adjustable-rate mortgage with a fixed interest rate for the first 5 years, after which the rate adjusts once per year based on a benchmark index plus a margin. The initial rate is typically lower than a comparable fixed-rate mortgage.
What are ARM rate caps?
ARM rate caps limit how much your interest rate can change. There are three types: the initial adjustment cap (first change after fixed period), the periodic cap (each subsequent adjustment, typically 2%), and the lifetime cap (total increase from initial rate, typically 5-6%).
When is a fixed rate better than an ARM?
A fixed rate is better when you plan to stay in the home long-term (beyond the ARM's fixed period), when rates are historically low, or when you prefer payment stability and do not want to worry about potential rate increases.
What happens when an ARM adjusts?
When an ARM adjusts, the new rate is calculated by adding the ARM margin (a fixed percentage, typically 2-3%) to the current index rate (such as SOFR). The new rate is then subject to the periodic and lifetime caps. Your monthly payment changes to reflect the new rate.
Can I refinance out of an ARM?
Yes, many borrowers refinance from an ARM to a fixed-rate mortgage before the adjustment period begins. This is a common strategy -- take advantage of the ARM's lower initial rate, then lock in a fixed rate before potential increases. Watch for prepayment penalties.