Fixed vs. Adjustable-Rate Mortgages: Which Is Right for You?

How Fixed-Rate Mortgages Work

A fixed-rate mortgage locks in your interest rate for the entire life of the loan. This means your monthly principal and interest payment stays the same from the first payment to the last, providing predictable housing costs.

Because the rate doesn't change, your monthly payment won't increase or decrease due to market fluctuations. This stability is a major reason why most homebuyers choose fixed-rate loans—the Consumer Financial Protection Bureau reports that from 2008 to 2022, fixed-rate loans were chosen by 85-95% of buyers.

Sources: Consumer Financial Protection Bureau

How Adjustable-Rate Mortgages Work

An adjustable-rate mortgage (ARM) has an interest rate that can go up or down over time. Most ARMs have a fixed interest rate for an initial period, often 3 or 5 years, after which the rate is recalculated—typically once per year—based on a market index plus a margin set by the lender.

Because the rate can adjust, your monthly principal and interest payment can increase or decrease after the initial fixed period. ARMs often start with a lower initial rate than comparable fixed-rate mortgages, which can make them attractive for certain borrowers.

Sources: Consumer Financial Protection Bureau

Key Differences at a Glance

The table below summarizes the main differences between fixed-rate and adjustable-rate mortgages, based on guidance from the Consumer Financial Protection Bureau.

Sources: Consumer Financial Protection Bureau

Pros and Cons

Both loan types have advantages and drawbacks. Here’s a quick breakdown to help you weigh them.

• Fixed-rate pros: Predictable payments for the life of the loan; no risk of rising rates; easier to budget long-term.
• Fixed-rate cons: Higher initial rate compared to an ARM; if market rates fall, you'd need to refinance to benefit.
• ARM pros: Lower initial rate, so your early payments are lower; if market rates fall, your rate can adjust down automatically.
• ARM cons: Payment can increase after the initial fixed period; greater uncertainty about future monthly costs.

Sources: Consumer Financial Protection Bureau, Investopedia

Scenarios Where Fixed vs. ARM Makes Sense

The right choice depends on your personal situation. Consider these common scenarios:

• A fixed-rate mortgage may be better if you plan to stay in the home for many years and want payment stability—you won't face rate surprises over the long term.
• An ARM can be a good option if you plan to move or refinance within the initial fixed period. Since you'll likely sell before the first rate adjustment, future rate changes won't affect you.
• If you expect your income to grow and can handle potential payment increases, an ARM might let you take advantage of a lower initial rate.

Sources: Consumer Financial Protection Bureau, Bankrate, Lower, Experian

Making the Decision: Key Criteria

When comparing fixed vs. adjustable, focus on your time horizon and comfort with risk. Ask yourself: How long do I plan to stay in this home? Can I afford a higher payment later if rates rise? Would I prefer the certainty of a fixed payment, even if it costs more upfront?

Rate caps on ARMs limit how much the interest rate can change at the first adjustment, at subsequent adjustments, and over the life of the loan. Understanding these caps is crucial before choosing an ARM, because they affect your worst-case payment increase.

• Stay duration: If you'll move before the initial fixed period ends, an ARM's lower rate could save money.
• Risk tolerance: If you need predictable payments, a fixed-rate loan is generally safer.
• Market outlook: If you believe rates will fall, an ARM could adjust downward, but this is uncertain.

Sources: Consumer Financial Protection Bureau, Investopedia