Should Tucson buyers consider an adjustable-rate mortgage?
An adjustable-rate mortgage (ARM) can lower your starting payment, but your rate can change after the introductory period, so it fits best if you’re prepared for the reset. The Mortgage Bankers Association reports that ARMs made up 10.5% of mortgage applications in mid-October, the highest share since October 2025, with ARM rates running about a full percentage point below 30-year fixed rates. On Pima County’s $385,000 median single-family price with 20% down, a gap of that size works out to roughly $199 a month in principal and interest, or about $11,900 over a five-year introductory period.
| By Michelle Ripley | October 23, 2026 |
When mortgage rates climb, buying a home can start to feel like trying to hit a moving target. Every jump makes the monthly payment bigger, and that pushes a lot of buyers to look for another way in.
More and more of them are finding one in the adjustable-rate mortgage, or ARM. It isn’t right for everyone, and I’m not a lender or a financial advisor, so you’ll want a loan officer to run your actual numbers. But it’s worth understanding how it works before you rule it in or out.
Why more buyers are looking at ARMs
With a fixed-rate mortgage, your rate stays the same for the whole loan. With an ARM, your rate is locked for the first few years, then it can move up or down with market conditions. The appeal is that the starting rate is usually lower.
That gap is a big part of the story right now. In the Mortgage Bankers Association’s weekly survey for the week ending October 9, the average 30-year fixed rate was 7.50%, the highest since November 2023, while the 5/1 ARM averaged 6.54%. MBA’s data shows ARMs held at 10.5% of applications the following week, and ARM rates were still almost a full percentage point below the 30-year fixed rate. Roughly 1 in 10 borrowers is choosing an ARM, which means most still prefer a fixed rate.
Here’s what that gap could mean in Tucson. On Pima County’s median single-family sale price of $385,000, with 20% down, principal and interest comes out to about:
- $2,154 a month on a 30-year fixed loan at 7.50%
- $1,955 a month on a 5/1 ARM at 6.54% during the introductory period
That’s a difference of about $199 a month, roughly $2,400 a year or $11,900 over five years. These are principal and interest only, and your actual numbers will depend on your down payment, credit, loan type, taxes, and insurance.
For some buyers, that’s enough to turn “not right now” into “let’s look.” With 4.4 months of supply, 48% of active single-family listings having cut their price, and homes closing about 1.6% below asking, it’s a market where buyers have room to negotiate, too. For more on how rates are shaping the Tucson market, see what 7% mortgage rates mean for Tucson inventory.
How a 5/1 ARM works, and the risk to plan for
Think of an ARM like a phone plan with an introductory deal. You start at a lower price, then it adjusts after a set period. A popular option is the 5/1 ARM. The “5” means your rate is locked for the first five years, and the “1” means it can change once a year after that. The change is called the reset.
When your rate resets, your payment could go up or down. Most ARMs have caps that limit how much the rate can rise each year and over the life of the loan, but you still need to be ready. Here’s a hypothetical to show why. Using the example above, after five years you’d owe about $288,500. If your rate then rose by one percentage point, your payment would be around $2,139, about $184 more than before. If it rose by two points, it would be around $2,330, about $376 more. Your own caps and terms will be different, so ask your lender for a worst-case scenario in writing.
You’ll have choices when the reset arrives:
- Keep the loan if the new payment still fits your budget
- Refinance into a fixed rate with a payment that never changes
- Refinance into another ARM with a new introductory period
- Sell the home
- Talk to your loan servicer about assistance or a loan modification
Remember that a refinance is a brand-new loan, and you have to qualify for it. Rates also might not be lower by then, so I wouldn’t count on refinancing as a guarantee. If you’re building your credit, my post on how a Tucson renter can build credit to buy a home is a good place to start.
An ARM may fit if you expect to sell, move, or pay down your loan before the reset, or if you could comfortably handle a higher payment. A fixed rate may fit better if you plan to stay a long time or if a higher payment would strain your budget.
Today’s ARMs also aren’t the ones from 2008. Back then, some loans had very small starting payments that later jumped, and some let people borrow without proving their income. Now the federal Ability-to-Repay rule requires lenders to verify your income and assets and assess whether you can afford the loan, including how your payment could change. That doesn’t remove the risk, but it makes today’s loans a different product.
What to do before you choose an ARM in Arizona
Here’s how I’d approach it:
- Ask your lender for a side-by-side comparison. Request the fixed-rate and ARM payments at today’s rates, plus the caps and what your payment could be at the highest point.
- Match the loan to your timeline. How long do you plan to stay? Your answer matters more than the rate.
- Compare other ways to lower your payment. With nearly half of listings cutting price, a seller credit toward closing costs or a rate buydown may be worth asking for on either loan type, subject to your loan program’s limits. Assumable loans are another option for certain homes.
- Use Arizona’s buyer protections. The standard AAR purchase contract gives you a 10-day default inspection period, and the BINSR (Buyer’s Inspection Notice and Seller’s Response) is how you request repairs or credits. Your contract also includes a financing contingency, so talk to your lender early about your loan choice. Review the seller’s SPDS, too.
- Keep your finances steady. Ask your loan officer how job changes or big purchases could affect your approval, and keep your credit in good shape until you close.
- Know your closing costs. Arizona has no meaningful transfer tax, just a flat $2 recording fee, and your closing runs through escrow.
For more on how rates and the Tucson market fit together, see our mortgage rates post.
The Bottom Line
Today’s market has more options than many buyers realize, and an ARM is one tool worth understanding. Whether it makes sense depends on your budget, your timeline, and how comfortable you are with a rate that can change.
Talk to a loan officer to see whether an ARM fits your situation. When you’re ready to see what your budget could buy in Pima County, reach out to me anytime and I’ll walk you through the market.
Frequently Asked Questions
What is a 5/1 ARM?
A 5/1 adjustable-rate mortgage has a fixed rate for the first five years, then the rate can change once a year after that. When it changes, your payment could go up or down, and most ARMs have caps on how much the rate can move. It’s one of the most common ARM types.
Are ARM rates lower than fixed rates right now?
Yes. The Mortgage Bankers Association reported that ARM rates were almost a full percentage point below the 30-year fixed rate in mid-October 2026. In its survey for the week ending October 9, the 30-year fixed averaged 7.50% and the 5/1 ARM averaged 6.54%. Rates change weekly, so ask your lender for a current quote.
How much could an ARM save on a Tucson home?
On Pima County’s $385,000 median single-family sale price with 20% down, a 5/1 ARM at 6.54% versus a 30-year fixed at 7.50% saves roughly $199 a month in principal and interest, or about $11,900 over five years. That excludes taxes, insurance, and HOA fees. Your actual savings depend on your loan terms.
What happens when an ARM resets?
Your rate adjusts based on market conditions, so your payment could rise or fall, within the loan’s caps. You can keep the loan, refinance into a fixed rate or another ARM, sell the home, or talk to your servicer about assistance. A refinance is a new loan you’ll need to qualify for.
Are today’s ARMs as risky as the ones from 2008?
They carry different safeguards. The federal Ability-to-Repay rule requires lenders to verify your income and assets and assess whether you can afford the loan, including how your payment could change. An ARM still has reset risk, so it’s smart to plan for the highest possible payment.
About Michelle Ripley Michelle Ripley is the owner and lead advisor of Ripley’s Real Estate Group with Keller Williams Southern Arizona, ranked among the top 1% of agents nationally. She serves buyers and sellers throughout Tucson, Oro Valley, Marana, and Pima County — from first-time buyers to luxury clients — with an education-first approach backed by data-driven marketing and deep local expertise. A proud Oro Valley resident, Michelle is known for treating every client relationship with the same integrity and care that built her reputation as one of Southern Arizona’s most trusted agents.
