An adjustable-rate mortgage (ARM) can be a smart fit for some Washington home buyers, but it depends on two big factors: how long you expect to keep the home and how comfortable you are with the possibility of future payment changes. An ARM starts with a fixed interest rate for an initial period and then adjusts later based on the loan terms. Buyers often consider ARMs because they can offer a lower initial rate than a comparable fixed-rate mortgage, but that early savings comes with more uncertainty down the road.
An adjustable-rate mortgage (ARM) loan is exactly what it sounds like. It is a home loan with an interest rate that changes, or adjusts, over time.
This feature sets it apart from the fixed mortgage loan, which carries the same rate for the entire repayment term. That’s one of your primary choices when shopping for a home loan in Washington State — fixed or ARM.
With most adjustable-rate mortgages, the interest rate will remain the same for the first few years before it starts to adjust. These are referred to as “hybrid” ARM loans, since they combine features of both an adjustable and a fixed mortgage.
The 5/1 ARM loan is a good example of a hybrid mortgage product. With this type of mortgage loan, the interest rate will remain fixed for the first five years. During that time, it essentially functions like a fixed-rate home loan. After that initial five-year period, however, the rate will begin to adjust every one year based on current market conditions and other factors.
That’s what the two numbers signify in the label. The first number tells you how long the rate remains fixed — the second number is the frequency (in years) of the subsequent adjustments.
Another example is the 7/1 adjustable-rate mortgage, which carries a fixed interest rate for the first seven years and then adjusts annually.
Before choosing an ARM, make sure you understand the parts of the loan that determine how long the introductory rate lasts and what can happen after that period ends.
The first item to verify is the initial fixed period. This tells you how long your starting rate will stay the same. In a 5/1 ARM, for example, the rate is fixed for five years. In a 7/1 ARM, it is fixed for seven years.
Next, look at the adjustment frequency. This tells you how often the rate can change after the fixed period ends. With a 5/1 or 7/1 ARM, that adjustment typically happens once per year after the initial fixed period.
You should also ask about the loan’s index and margin. According to the Consumer Financial Protection Bureau, the index and margin help determine what your interest rate will be at each adjustment. The margin is set by the lender, and the adjusted rate is generally based on the index plus the margin, subject to any caps in the loan terms.
Another key item is the rate caps. These caps limit how much the interest rate can increase at the first adjustment, at later adjustments, and over the life of the loan. Caps are important because they help define the range of possible future payment changes.
Finally, review how a payment change could happen after the fixed period. If the rate adjusts upward, your monthly principal and interest payment can increase. That is why borrowers should compare not only the starting payment, but also whether the loan would still feel manageable if the rate rises later. The CFPB also advises borrowers to read the fine print carefully so they understand when the rate can change and how much the payment could increase.
An ARM may fit best when your expected ownership timeline is shorter than the fixed period, you want a lower initial rate, and you have enough flexibility in your budget to handle future changes if your plans shift.
A simple way to evaluate the choice is to ask yourself four questions:
In general, an ARM is often better suited to buyers who want lower upfront borrowing costs and have a clear short- to medium-term plan. A fixed-rate mortgage is often better for buyers who expect to stay put for a long time or who value long-term payment consistency more than potential early savings.
Related: Adjustable versus fixed mortgages
A lot of Washington State home buyers who use adjustable mortgages do so because they expect to sell or refinance before the adjustments begin.
ARM loans can appeal to people who expect to be in a home for only a few years. Military members who change duty stations every few years are one example. In that kind of scenario, a borrower might benefit from the lower initial rate and then move before the first adjustment happens.
But it is important not to treat that outcome as a certainty. A future refinance depends on factors like your finances, home value, and market conditions at that time. Selling can also take longer than expected or happen under different conditions than you originally planned. For that reason, it is wise to choose an ARM only if the loan still feels manageable even if your timeline changes.
That’s just one example of when it might make sense to use this particular mortgage option. The important thing to realize is that all mortgage loans have pros and cons associated with them. As a home buyer, the best strategy is to choose the type of loan that meets your financing goals.
Different products for different scenarios.
Sammamish Mortgage can help. We serve clients across Washington, Idaho, Colorado, Oregon, and California. Since 1992, we’ve been providing several mortgage programs and products with flexible qualification criteria to borrowers across the Pacific Northwest. Visit our website to get an instant rate quote or to use our online mortgage calculator. Or, reach out to us if you are ready to get pre-approved for a mortgage.
An adjustable-rate mortgage starts with a fixed interest rate for an initial period and then adjusts later based on the loan terms. After the fixed period ends, the new rate is generally determined by the loan’s index plus the lender’s margin, subject to any caps in the mortgage.
Yes. ARM loans are still offered as a mortgage option alongside fixed-rate loans. Common examples include hybrid ARMs such as 5/1 and 7/1 loans, which begin with a fixed rate before later adjustments start.
The main difference is how long the starting rate stays fixed. A 5/1 ARM keeps the initial rate for five years, while a 7/1 ARM keeps it for seven years. After that, both typically adjust once per year.
It can be a good fit when you expect to keep the home for a shorter period, want a lower initial rate, and are comfortable with the possibility of future payment changes. If long-term payment stability matters more, a fixed-rate mortgage is often the better fit.
The main downside is uncertainty after the fixed period ends. If rates adjust upward, your monthly principal and interest payment can increase. That is why it is important to review the adjustment terms, rate caps, and whether the payment would still fit your budget later.
An ARM may make more sense when your expected ownership timeline is shorter than the fixed period, you want lower upfront borrowing costs, and you have enough budget flexibility to handle future changes if your plans shift. A fixed-rate loan is usually better for buyers who expect to stay longer or want consistent payments.
Qualification depends on the lender and the mortgage program. In general, borrowers still need to meet the loan’s credit, income, and other underwriting requirements, just as they would with other mortgage options.
That depends on the rate caps built into the loan. Caps limit how much the rate can increase at the first adjustment, at later adjustments, and over the life of the loan. They do not prevent increases altogether, but they help define the range of possible payment changes.
In some cases, yes. But refinancing is never guaranteed. Your ability to refinance later will depend on your financial situation, home value, and lending conditions at that time.
They can be. ARM loans often appeal to buyers who expect to sell or move before the first adjustment begins, because they may benefit from the lower initial rate during that period. Even so, it is wise to choose an ARM only if the loan would still feel manageable if your timeline changes.
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