Almost every buyer I am working with right now asks some version of the same question: should I take the lower rate today and deal with the adjustment later, or lock in a fixed payment and stop thinking about it? It comes up on second showings, in late night text threads, and in nearly every pre-approval conversation.

It is a fair question. The honest answer depends less on where the market is headed and more on how long you actually plan to own the home.

Seattle's median sale price has been running somewhere around $870,000 to $890,000, and 30-year fixed rates have been holding in the low to mid 6 percent range. At that price point, half a point of rate is real money. So let me walk through how adjustable rate mortgages actually work, what they can save you, and where they can bite.

How an adjustable rate mortgage actually works

An ARM today is not the loan people remember from 2008. The current version is heavily regulated, fully underwritten, and honestly pretty boring compared to its reputation.

The most common structure you will see is a 7/6 ARM. Your rate is fixed for the first seven years, then adjusts every six months after that. You will also see 5/6 and 10/6 options. The first number is how many years the rate stays put. The second is how often it can move once that period ends.

The caps are the part that matters

Every ARM comes with caps that limit how far your rate can travel. A common structure is 5/1/5: the first adjustment cannot move more than 5 percentage points, each adjustment after that cannot move more than 1, and the rate can never sit more than 5 points above where it started.

Those caps are the whole ballgame. Before you sign anything, you should know your worst case payment, not just your starting one. If your lender cannot tell you that number in a single sentence, keep asking until someone can.

What the rate gap looks like in Seattle right now

The only reason to consider an ARM is the discount up front. Lately the spread between a 30-year fixed and a 7/6 ARM has been running somewhere between a quarter point and three quarters of a point, depending on the lender and the week.

Here is what that looks like in real numbers. On an $800,000 purchase with 20 percent down, you are financing $640,000. Half a point of rate is roughly $200 a month. Over seven years, that is close to $17,000 you keep. That is not nothing, especially when you are also absorbing property taxes, insurance, and whatever the inspection turned up.

But the spread moves constantly. Some weeks it is wide enough to matter, and some weeks it is thin enough that the fixed rate is the obvious call. Ask your lender to price both options on the same day, in writing, and compare the actual numbers instead of the general idea.

When an ARM makes sense

There are four situations where I think an adjustable rate deserves a serious look:

1. You have a concrete reason to believe you will move or refinance inside the fixed period. A known relocation, a growing family already outgrowing a two bedroom, a role with a defined term.
2. Your income is very likely to rise. An equity vest schedule you can count on, a partner returning to work, a clear promotion track.
3. You have real cash reserves. If a higher payment in year eight would be annoying rather than dangerous, you have room to take the risk.
4. The spread is genuinely wide. Under a quarter point, the savings usually are not worth the uncertainty.

That first one is the big one, and it is where people fool themselves. I have had clients tell me with total confidence they would move in five years, then fall for the neighborhood and stay fifteen. Plans change. Be honest about how firm yours actually is.

When a fixed rate is the better call

If this is the home you plan to be in for a long stretch, take the fixed rate. That is most first-time buyers I work with.

Same answer if a payment increase would genuinely hurt. Someone stretching to get into Beacon Hill or Greenwood at the top of their budget should not stack payment uncertainty on top of a budget that is already tight. Certainty has value, and for a lot of buyers that value beats a few hundred dollars a month.

It also helps to be clear-eyed about what forecasters are actually saying. Most 2026 projections have rates clustering around 6.0 to 6.3 percent, not falling off a cliff. If your ARM plan depends on refinancing into something dramatically cheaper by 2033, you are betting on something nobody can promise you.

Five questions to ask your lender before you decide

• What is the index and the margin on this ARM, and what would my rate be if it adjusted today?
• What are the caps, and what is my highest possible payment under them?
• What is the actual rate spread between this ARM and a 30-year fixed, quoted today?
• What would it cost to buy the fixed rate down instead, and how many months until that pays for itself?
• Are there any prepayment penalties?

Any good Seattle lender will answer all five in about ten minutes. If you get vague answers or a lot of hedging, that tells you something useful about who you are working with.

Here is what I tell my clients. The loan is a tool, not an identity. The right one depends on how long you plan to own the home, how steady your income is, and what lets you sleep at night. I would much rather spend an hour helping you get that answer right than watch you take on a payment that quietly stresses you out for a decade. If you are weighing an ARM against a fixed rate on a Seattle purchase, reach out. My team at Emerald Group works with lenders who will put both sets of numbers side by side, and I would love to help you think it through.

Ready to buy in Seattle? Brennen Clouse at Emerald Group is here to help. Call or text 206-899-9101 or visit emeraldgroupre.com.