Choosing between a fixed-rate and adjustable-rate mortgage is one of the most important decisions you will make as a homebuyer. Here is how to decide.
With a fixed-rate mortgage, your interest rate stays the same for the entire loan term — 10, 15, 20, or 30 years. Your principal and interest payment never changes, making budgeting simple and predictable. Fixed rates are ideal when rates are low, you plan to stay in the home long-term, or you want payment stability regardless of market conditions.
An ARM has a fixed rate for an initial period (typically 3, 5, 7, or 10 years), after which the rate adjusts periodically based on a benchmark index plus a margin. A 5/1 ARM means 5 years fixed, then adjusts annually. ARMs typically start lower than fixed rates, offering initial savings.
ARMs can be advantageous if you plan to sell or refinance before the initial fixed period ends, if you expect interest rates to fall, or if the rate savings will meaningfully lower your payment. The risk is that rates could rise significantly once the ARM adjusts, potentially making your payment unaffordable.
ARMs include rate caps to limit how much your rate can change. The initial cap limits the first adjustment, the periodic cap limits each subsequent adjustment, and the lifetime cap limits the total increase over the life of the loan. A common structure is 2/2/5: rate cannot rise more than 2% at first adjustment, 2% per subsequent adjustment, and 5% total.
If you plan to stay in your home for 7+ years and value payment stability, a fixed-rate mortgage is usually the safer choice. If you will likely move within 5 years or expect rates to drop, an ARM lower initial rate could save you money. Use our mortgage calculator to compare monthly payments at different rate scenarios.
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