An adjustable rate mortgage (ARM) starts with a fixed interest rate for an initial period — typically 5, 7, or 10 years — then adjusts periodically based on market conditions. ARMs often come with a lower starting rate than fixed mortgages, which can mean meaningful savings in the early years of the loan.
They are not right for everyone. But for the right borrower in the right situation, an ARM is a legitimate financial tool — not a gamble. The key is understanding exactly how it works, what the caps protect you from, and whether your timeline makes the risk worth taking. That is the honest conversation we have with every client who asks about ARMs.
ARMs are described with two numbers — for example, a 7/1 ARM. The first number is the fixed-rate period in years — your rate stays exactly the same for that entire period. The second number is how often the rate adjusts after that — in the case of a 7/1 ARM, once per year after year seven.
Each adjustment is tied to a benchmark index — currently SOFR (Secured Overnight Financing Rate) for most loans — plus a margin set by the lender at origination. Your rate at each adjustment equals the current index plus that fixed margin. Rate caps limit how much your rate can move at any single adjustment and over the life of the loan.
5/1 ARM
Fixed for 5 years, then adjusts annually. The lowest starting rate of the three common structures. Best for buyers with a clear plan to sell or refinance within 5 years. The shortest fixed window — carry more risk if plans change.
7/1 ARM
Fixed for 7 years, then adjusts annually. The most popular ARM structure — long enough to cover most realistic ownership timelines for buyers who are not planning to stay forever, with a meaningfully lower starting rate than the 30-year fixed. A solid middle ground.
10/1 ARM
Fixed for 10 years, then adjusts annually. The most conservative ARM — a decade of payment certainty with a rate typically 0.25%–0.50% below the 30-year fixed. For buyers who want some rate advantage but a long runway before any adjustment risk.
The most important thing to understand about an ARM is the cap structure. Caps limit how much your rate can move — at the first adjustment, at each subsequent adjustment, and over the entire life of the loan. Most ARMs use a 2/2/5 cap structure:
Understanding the 2/2/5 Cap Structure
On a 7/1 ARM starting at 6.0% with a 2/2/5 cap structure, your rate could never exceed 11.0% over the life of the loan — regardless of what happens to market rates. We always show you the worst-case payment scenario so you know what you are protected against before you decide.
📈 ARM Makes Sense When...
🏠 Fixed Rate Makes Sense When...
The Honest ARM Conversation — What We Tell Every Client
An ARM is a legitimate financial tool when your timeline matches the fixed period. If you know you are selling in five years, a 7/1 ARM gives you a lower rate for your entire ownership window with essentially no adjustment risk. That is not gambling — that is matching the loan structure to your actual situation.
Where ARMs get people in trouble is when they take a 5/1 ARM assuming they will refinance before the adjustment, and then life changes — job loss, market conditions, credit issues — and the refinance does not happen. The payment goes up and they are unprepared. We always run the worst-case scenario number so you know what you are signing up for if your plan does not go as expected. That conversation takes five minutes and it is non-negotiable before we recommend an ARM to anyone.
ARMs are available across all four states we serve and are particularly attractive in certain market segments. In higher-priced markets like Scottsdale, Paradise Valley, Ponte Vedra Beach, and Austin, a jumbo ARM can produce meaningful monthly savings during the fixed period on a $800K–$1.5M loan. In those scenarios, the rate differential between an ARM and a 30-year fixed translates to hundreds of dollars per month — and that math deserves a serious look.
We shop wholesale ARM rates across multiple lenders the same way we shop fixed rates — to find the best starting rate and cap structure available for your specific loan amount, credit profile, and state.
Is an ARM risky?
It depends entirely on your situation and timeline. If you plan to sell or refinance before the fixed period ends, an ARM carries very little real-world risk — you get the benefit of the lower rate without ever experiencing an adjustment. If you plan to stay long-term and rates rise significantly, your payment could increase substantially. The key is understanding the cap structure, knowing your worst-case payment, and being honest about your actual timeline — not your optimistic timeline.
Can I refinance out of an ARM into a fixed rate?
Yes — and many borrowers do exactly this before their fixed period ends if rates are favorable. The Rate Watch system we offer is particularly useful for ARM holders — we monitor rates on your behalf and reach out when refinancing into a fixed rate makes financial sense, so you are never caught off guard by an approaching adjustment date.
What index is my ARM tied to?
Most modern ARMs are tied to SOFR — the Secured Overnight Financing Rate — which replaced LIBOR as the standard benchmark in 2023. Your rate at each adjustment equals the current SOFR plus a fixed margin set at origination. We explain exactly how your rate is calculated at closing so there are no surprises when the first adjustment comes.
What is the rate difference between an ARM and a 30-year fixed right now?
The spread between ARM and fixed rates changes with market conditions and is specific to your loan amount, credit score, and state. In general, 7/1 ARMs run 0.25%–0.75% below the 30-year fixed — the difference is more meaningful on larger loan amounts. We will show you the exact rate options for both structures for your specific scenario so you can see the real dollar difference before deciding.
What happens if I still have an ARM when the fixed period ends?
Your rate adjusts to the current index plus your margin — subject to the cap structure. With a 2/2/5 cap, the first adjustment can move no more than 2% in either direction. We will tell you the worst-case payment at each scenario so you know exactly what you are protected against. And if you decide you want out of the ARM before the adjustment, we will help you time the refinance correctly.
Can I get a jumbo ARM?
Yes — and jumbo ARMs are one of the scenarios where the ARM structure makes the most financial sense. On a $1M loan, even a 0.5% rate difference between a 7/1 ARM and a 30-year fixed translates to hundreds of dollars per month during the fixed period. We have the wholesale lender relationships to compete on jumbo ARM rates in all four states we serve.
Not sure which is right for you? That is exactly the conversation we are here for. We will look at your timeline, your goals, today's rates on both options, and your worst-case scenario — and give you a straight answer on which makes more financial sense for your specific situation. No pressure, no obligation.
Get Your Free Pre-ApprovalOr call or text Kirk or Ken directly at (248) 459-5511
First Commerce Financial | Licensed Independent Mortgage Broker | NMLS #137512 | AZ MB #1001354 | Licensed in Michigan, Florida, Arizona, and Texas | Ken Turkington NMLS #137873 | Kirk Chivas NMLS #160828
