An adjustable-rate mortgage (ARM) can make sense for some Washington home buyers who want a lower introductory rate and expect to move, sell, or refinance before the rate begins adjusting. The tradeoff is that an ARM does not offer the same long-term payment predictability as a fixed-rate mortgage, so it works best when the borrower has a clear plan and enough flexibility for future payment changes.
In this article, we’ll focus on ARM loans as a home-purchase option in Washington State. You’ll learn what an ARM is, how today’s hybrid ARM loans work, and what to weigh against a fixed-rate mortgage before choosing one.
Most of the adjustable mortgage loans available in Washington State these days are actually considered “hybrid” loans. They get this name because they combine features of both a fixed and adjustable mortgage product. The 5/1 ARM is a good example. Those numbers indicate that the rate remains fixed (unchanging) for the first five years, after which it will adjust (change) each year.
One of the advantages of using an ARM loan to buy a home in Washington is that you could secure a lower rate, compared to a fixed mortgage. That’s because ARMs typically start out at a lower interest rate than their fixed counterparts.
For example, an ARM can offer a lower introductory rate than a comparable fixed mortgage. That can create some savings during the initial stage of the loan, depending on the product and market conditions.
As mentioned above, a lot of the adjustable mortgage loans used in Washington start off with a lower rate than a fixed mortgage. And it might stay that way for several months, a year, or even a few years. But that can all change after the initial/introductory period is over.
When this introductory period has passed, your interest rate will begin to change. It might go up or down, depending on market trends. ARM loans are typically tied to a benchmark index, and today that generally means alternatives such as SOFR rather than LIBOR.
If you’re considering an ARM for a home purchase, it helps to review the parts that control how the loan changes over time. As the Consumer Financial Protection Bureau explains, this is one of the key ways borrowers can decide whether an adjustable-rate mortgage is the right choice and take more control of the homebuying process.
First, look at the fixed period. This is the introductory stretch when your rate does not change. Next, check the adjustment interval, which tells you how often the rate can change after that fixed period ends.
You should also review the index and margin. For an adjustable-rate mortgage, the index is an interest rate, while the margin is a number set by your lender. Those two pieces help determine the new rate once adjustments begin.
Finally, pay close attention to the caps. Periodic caps limit how much the rate can change at a single adjustment, and lifetime caps limit how much it can increase over the life of the loan. Even with those limits, your monthly payment can rise after the introductory term ends, so Washington buyers should compare the initial payment with a higher adjusted-payment scenario before choosing an ARM.
“Why would someone want to use a mortgage loan with a rate that could rise over time?”
This is a common question among home buyers. The answer is that, in certain situations, an ARM loan is the right “tool” for the job. It can be a real money-saver, due to the lower initial rate.
A lot of the folks who use these loans plan to either sell or refinance their homes down the road. So the logic is that they’ll use an adjustable-rate mortgage initially to get the lowest possible interest rate, and then either replace it (by refinancing) or pay it off (by selling) a few years down the road.
An ARM may be worth a closer look if you expect to own the home for a relatively short period, anticipate a relocation, or want lower initial payments and have room in your budget if those payments rise later. It can also fit borrowers who understand that refinancing is a possible option, but not something they should assume will always be available on favorable terms.
A fixed-rate mortgage may be the safer choice if you expect to stay in the home for many years, want maximum payment predictability, or would feel strained by a higher payment after the fixed period ends. The key question is not just whether the ARM starts lower, but whether your timeline, budget flexibility, and tolerance for future payment changes make that tradeoff acceptable.
The 30-year fixed-rate mortgage remains the main comparison point for buyers who are deciding whether an ARM makes sense. While an ARM may offer a lower introductory rate, a fixed-rate loan gives borrowers something many people value just as much: stable principal-and-interest payments and predictable long-term budgeting.
For some Washington home buyers, that predictability matters more than the chance to save money upfront. If you plan to stay in the home for the long haul, or simply want to avoid the uncertainty that comes with future rate adjustments, a fixed-rate mortgage can be the better fit even if the starting rate is higher than an ARM’s introductory rate.
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, or ARM, is a home loan with an interest rate that can change over time. Many ARMs used by Washington home buyers today are hybrid loans, which means the rate stays fixed for an introductory period and then adjusts at set intervals after that.
Yes. ARM loans are still widely available, and most current options are hybrid ARMs rather than loans that adjust right away. A common example is a 5/1 ARM, where the rate is fixed for the first five years and then can change once a year after that.
With a 5/1 ARM, the interest rate stays fixed for the first five years of the loan. After that, the rate can adjust once each year based on the loan terms, including the index, the lender’s margin, and any applicable caps.
ARMs often begin with a lower introductory rate than comparable fixed-rate mortgages. That lower starting rate can reduce the payment during the initial fixed period, which is one reason some buyers consider an ARM when purchasing a home in Washington.
Once the fixed period ends, the interest rate begins adjusting according to the terms of the loan. The rate may go up or down depending on market conditions and the benchmark index tied to the mortgage, so the monthly payment can also change.
ARM adjustments are generally based on an index plus a margin set by the lender. The index is a market-based interest rate benchmark, and today that generally means alternatives such as SOFR rather than LIBOR. Together, the index and margin help determine the new rate when adjustments begin.
Rate caps are limits on how much an ARM can change. Periodic caps limit how much the rate can increase at a single adjustment, and lifetime caps limit how much it can rise over the full life of the loan. Even with caps, the payment can still increase after the introductory term ends.
An ARM may make sense when a buyer expects to own the home for a shorter period, plans to move, sell, or refinance before the first adjustment, or wants lower initial payments and has enough room in the budget if payments rise later. It works best when the borrower has a clear plan and can handle future payment changes.
Yes, refinancing an ARM is possible, and some borrowers choose an ARM with the intention of refinancing before the rate starts adjusting. But refinancing should not be treated as a guarantee, because favorable terms and loan approval may not always be available when the time comes.
Compare the lower initial ARM payment against the possibility of a higher payment after the fixed period ends. A 30-year fixed mortgage offers stable principal-and-interest payments and long-term predictability, while an ARM may offer upfront savings but less certainty later. The better fit depends on your timeline, budget flexibility, and comfort with future payment changes.
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