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 significant savings in the early years of your loan.
They’re not right for everyone, but for the right borrower in the right situation, an ARM can be a smart financial move.
How Does an ARM Work?
ARMs are described with two numbers — for example, a 7/1 ARM:
- The first number (7) is the fixed-rate period in years — your rate stays the same for 7 years
- The second number (1) is how often the rate adjusts after that — in this case, once per year
Common ARM structures include:
- 5/1 ARM — fixed for 5 years, then adjusts annually
- 7/1 ARM — fixed for 7 years, then adjusts annually
- 10/1 ARM — fixed for 10 years, then adjusts annually
Each adjustment is tied to a benchmark index (like SOFR) plus a margin set by the lender. Most ARMs also have rate caps that limit how much your rate can increase at each adjustment and over the life of the loan.
When Does an ARM Make Sense?
An ARM is worth considering if:
- You plan to sell or refinance before the fixed period ends — you’d get the benefit of the lower rate without ever experiencing an adjustment
- You expect interest rates to drop — if rates fall, your ARM adjustments could actually go down
- You want the lowest possible payment in the early years of the loan — useful if you’re expecting income to grow or have other financial priorities now
- You’re buying a property you don’t plan to keep long-term
When Is a Fixed Rate the Better Choice?
A fixed rate mortgage is likely the better choice if:
- You plan to stay in the home long-term — 10+ years
- You want payment stability and predictability for budgeting
- You’re in a low-rate environment and want to lock in that rate permanently
- The rate difference between the ARM and fixed option isn’t significant enough to justify the risk
ARM Rate Caps — Your Protection Against Big Increases
One of the most important things to understand about an ARM is the rate cap structure. Most ARMs have three caps:
- Initial cap — limits how much the rate can increase at the first adjustment (typically 2%)
- Periodic cap — limits how much the rate can increase at each subsequent adjustment (typically 2%)
- Lifetime cap — limits the total rate increase over the life of the loan (typically 5-6%)
So on a 7/1 ARM with a 2/2/5 cap structure, if your starting rate is 6%, your rate could never exceed 11% over the life of the loan — no matter what happens to market rates.
ARM Loans in Michigan, Arizona, Florida & Texas
ARMs are available across all four states we serve and can be a particularly attractive option in higher-priced markets like Scottsdale, where the lower initial payment on a jumbo ARM can create meaningful savings during the fixed period.
Frequently Asked Questions
Is an ARM risky?
It depends on your situation. If you plan to sell or refinance before the fixed period ends, an ARM carries very little risk. If you plan to stay long-term and rates rise significantly, your payment could increase. The key is understanding the cap structure and making sure you can afford the maximum possible payment if rates hit the ceiling.
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. We can help you time that refinance to make sure you’re never caught off guard by an adjustment.
What’s the difference between an ARM and a fixed rate mortgage?
A fixed rate mortgage has the same interest rate for the entire loan term — your payment never changes (excluding taxes and insurance). An ARM has a fixed rate for an initial period, then adjusts based on market conditions. Fixed rates offer stability; ARMs offer a lower starting rate with some future uncertainty.
What index is my ARM tied to?
Most modern ARMs are tied to the Secured Overnight Financing Rate (SOFR), which replaced LIBOR. We’ll explain exactly how your rate is calculated so there are no surprises.
Let’s Find the Right Loan for Your Situation
Not sure whether an ARM or a fixed rate is right for you? That’s exactly the conversation we’re here for. We’ll look at your timeline, your goals, and today’s rates — and give you a straight answer on which option makes more financial sense.
Serving homeowners and homebuyers across Michigan, Arizona, Florida, and Texas.
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