Fixed-Rate vs. Adjustable-Rate Mortgages

One of the most significant choices when selecting a mortgage is whether to choose a fixed interest rate or an adjustable one. This lesson explains how each works and the general tradeoffs to consider.

Fixed-rate mortgages

Because the rate never changes, fixed-rate mortgages offer predictability, which can make budgeting easier over time. Even though taxes and insurance costs may still change, the core principal and interest payment remains constant.

Adjustable-rate mortgages

ARMs are often described with two numbers, such as 5/1, where the first number indicates how many years the initial rate is fixed, and the second indicates how often the rate can adjust afterward, in this example every one year. Structures vary by lender and product, so it is important to read the specific terms of any ARM being considered.

Why ARMs often start with lower rates

Lenders often offer a lower initial interest rate on ARMs compared to fixed-rate loans, as an incentive, since the borrower is taking on the risk that rates could rise later. This initial period can make ARMs attractive for buyers who plan to sell or refinance before the fixed period ends, but it also introduces uncertainty if plans change.

Rate caps and adjustment terms

Reviewing these details with a lender, and asking for a worst-case payment estimate, helps set realistic expectations if you're considering an ARM.

Factors to weigh

• How long you plan to stay in the home: shorter expected ownership periods may make an ARM's lower initial rate more appealing, though plans can change.
• Your tolerance for payment uncertainty: fixed-rate loans offer predictability that some buyers strongly prefer.
• Current market conditions: the relative gap between fixed and adjustable rates can vary over time and influence which option looks more favorable.
• Your financial cushion: the ability to absorb a potential payment increase is an important consideration with ARMs.

A common mistake

There is no universally "better" choice between fixed and adjustable rates. The right fit depends on individual plans, risk tolerance, and the specific terms offered, so comparing actual loan estimates with a lender is the best way to decide.