Adjustable-Rate Mortgages Are Back: A Scottsdale Buyer's Guide

by Jeff Hernandez

Author: Jeff Hernandez | Arizona Realtor® & Attorney | The Connie Colla Group at RETSY

An adjustable-rate mortgage (ARM) can be a smart tool for a Scottsdale buyer who expects to sell, refinance, or pay down the loan before its fixed period ends, and who could carry the higher payment if rates reset upward. It is the wrong tool for anyone who needs a future refinance to make the home affordable. That distinction matters more this fall than it has in two years.

In late September, the Mortgage Bankers Association's weekly applications survey reported the average 30-year fixed rate at 7.12 percent, its highest level since May 2024. Borrowers responded by shifting toward ARMs. The ARM share of applications rose to 9.8 percent. Marketplace's reporting on the shift noted that share was closer to 8 percent a month earlier, and the economists it interviewed were careful to separate the savings from the risk. This guide does the same, with the numbers that matter at Scottsdale price points.

This article is for general informational purposes only and does not constitute lending, financial, or investment advice. Consult a licensed mortgage professional or financial advisor regarding your specific situation.

Why Are More Homebuyers Choosing Adjustable-Rate Mortgages?

Buyers are choosing ARMs because the starting rate is meaningfully lower. In that same MBA survey, the average 5/1 ARM rate was 6.10 percent, more than a full percentage point below the 30-year fixed. On jumbo balances, the 30-year fixed averaged 7.15 percent.

Susan Wachter, a real estate professor at the Wharton School, told Marketplace that a 7 percent rate looks daunting next to an ARM priced in the low 6s, and that the gap can make a real difference in affordability. In Scottsdale, that gap compounds. A one-point spread on a $500,000 loan is a pleasant savings. On a $1.2 million loan for a home in DC Ranch or the Cactus Corridor, it is a different conversation entirely, and that is exactly why the ARM question comes up so often in luxury transactions.

How Does an Adjustable-Rate Mortgage Work?

An ARM holds a fixed introductory rate for a set number of years, then adjusts periodically based on a market index plus a fixed margin set by the lender. The Consumer Financial Protection Bureau's handbook on adjustable-rate mortgages walks through each of these components and includes a worksheet for comparing loans side by side.

What Do 5/1, 7/1, and 10/1 Mean?

The first number is the length of the fixed period in years. The second number describes how often the rate can change after that period ends. A 5/1 ARM holds its rate for five years, then can adjust once a year. A 7/1 or 10/1 buys more years of certainty, usually at a slightly higher starting rate. Some lenders now adjust every six months after the fixed period, so the second number deserves the same attention as the first.

How Do Rate Caps Limit the Maximum ARM Payment?

Rate caps set the ceiling on how far the rate can move. According to the CFPB's explanation of ARM rate caps, loans typically carry three types of caps: initial adjustment cap (commonly 2 or 5 percentage points at the first reset), subsequent adjustment cap (most commonly 2 points at each later reset), and lifetime cap (most commonly 5 points above the starting rate). The CFPB also points out that two lenders can quote the same starting rate with very different caps. The caps, not the teaser rate, define the worst case.

What Does an ARM Save on a Scottsdale Jumbo Loan?

On a $1.2 million loan, a 5/1 ARM at 6.10 percent saves roughly $830 a month in principal and interest compared with a jumbo 30-year fixed at 7.15 percent, or about $50,000 over the first five years. Any loan above $832,750 is a jumbo loan in most of the country, per the 2026 conforming loan limit set by FHFA. At Silverleaf, Paradise Valley, or Desert Mountain price points, even a generous down payment usually leaves a balance above that line.

The table below uses the MBA survey averages for illustration only. Jumbo ARM pricing varies by lender, and figures cover principal and interest only.

Scenario ($1.2M loan)	Rate	Monthly P&I
30-year fixed, jumbo	7.15%	$8,105
5/1 ARM, years 1 to 5	6.10%	$7,272
ARM after reset, 2-point initial cap	8.10%	$8,703
ARM after reset, 5-point initial cap	11.10%	$11,039

After five years, about $1.118 million of the balance remains. If the rate resets by two points, the payment lands roughly $600 a month above the fixed loan the buyer passed on. Under a five-point initial cap, the payment rises by nearly $3,800 a month. Wachter offered almost the same example: a 6 percent loan today could reset to 8.10 percent in five years, a level many borrowers would struggle to afford.

Property taxes, homeowners insurance, and HOA dues sit on top of these figures. Buyers should also plan for rising home insurance costs and run their own numbers with a mortgage calculator before settling on a loan type.

What Are the Biggest Risks of an Adjustable-Rate Mortgage?

The biggest risk is the refinance bet: assuming rates will fall before the loan adjusts. Chris Mayer, professor emeritus at Columbia Business School, called that assumption a dangerous game in his Marketplace interview, because mortgage rates are hard to predict and can rise as easily as fall.

A second risk that luxury buyers often overlook involves the connection between refinancing and home values. If home values soften, a refinance may not be available at all, particularly for a buyer who put little money down. Scottsdale buyers have watched this dynamic play out in real time, with price cuts across Scottsdale listings and rising housing inventory in Arizona reminding everyone that appreciation is not guaranteed on any timeline.

The third risk is time itself. Plans to sell in five years have a way of becoming eight or ten. The National Association of REALTORS 2025 Profile of Home Buyers and Sellers found that the typical seller had owned the home for 11 years, a record. A five-year fixed period covers less than half of that.

Who Is a Good Candidate for an ARM in Scottsdale?

An ARM fits a buyer with a defined horizon and the financial reserves to absorb a reset. Across North Scottsdale, Paradise Valley, and Arcadia, that profile usually looks like one of these: relocating executives with a known assignment length; buyers expecting a liquidity event such as the sale of a prior home or a business and planning to pay the balance down substantially within the fixed period; or seasonal and second-home buyers with strong income and assets, for whom a second home can serve as a retirement asset and the loan is one piece of a larger plan.

An ARM is a poor fit for a buyer who qualifies only at the starting rate. If the post-reset payment would strain the household budget, the lower introductory rate is borrowing comfort from the future. Neighborhood matters, too. Buyers shopping Silverleaf luxury homes, DC Ranch, or Paradise Valley estates often hold properties longer than they first expect, which argues for a 7/1 or 10/1 over a 5/1 when the spread between them is small.

What Questions Should You Ask Your Lender Before Choosing an ARM?

Ask the questions that reveal the worst case, not just the starting payment: Which index does the loan follow, and what is the margin? What are the initial, subsequent, and lifetime caps? How often does the rate adjust after the fixed period? What is the maximum possible payment in dollars? Is there a prepayment penalty if the loan is paid off or refinanced early? A licensed mortgage professional can answer each of these in writing. Buyers should compare at least two lenders, since caps and margins vary more than starting rates do.

Why Loan Terms and Contract Deadlines Have to Line Up

A luxury purchase contract and the loan behind it run on the same clock. Appraisal timing, loan approval deadlines, and the type of loan the buyer intends to use all need to match what the contract allows. When they drift apart, deals fail late and expensively, which is why preventing a home sale from falling through starts at the offer stage.

Jeff Hernandez, Esq., reads contracts with the perspective of a licensed attorney. He has been a licensed attorney since 1992 and a licensed REALTOR since 2019, bringing more than 30 years of combined professional experience. That perspective shows up in the details: confirming that financing terms and deadlines are realistic for the loan program chosen, and that a buyer's timeline holds together before anything is signed. It is one of the reasons buyers working through the complete guide to buying a luxury home in Scottsdale find the process steadier than they expected.

Frequently Asked Questions About Adjustable-Rate Mortgages

Is an adjustable-rate mortgage a good idea right now?

It can be, for the right buyer. With fixed rates above 7 percent, a 5/1 ARM can lower the starting payment meaningfully. It works best for buyers with a clear plan to sell, refinance, or pay down the loan, and the reserves to handle the payment if the rate resets higher.

How much can an ARM rate go up?

It depends on the caps written into the loan. According to the CFPB, initial caps are commonly 2 or 5 percentage points, later adjustments are commonly capped at 2 points, and lifetime caps are commonly 5 points above the starting rate. Always ask for the maximum possible payment in dollars.

Can I refinance an ARM before it adjusts?

Yes, if you qualify at the time. Refinancing depends on future rates, your income, and your home's appraised value. If rates rise or home values fall, a refinance may cost more than expected or not be available, which is why it should never be the only plan.

Are ARMs available on jumbo loans in Scottsdale?

Yes. Many lenders offer ARMs on loan balances above the $832,750 conforming limit, and luxury buyers use them often. Jumbo ARM rates, caps, and reserve requirements vary widely by lender, so comparing several written quotes is essential.

Choose the Loan That Fits Your Plan

The rise in ARM applications is a rational response to 7 percent fixed rates. It is also a reminder that the cheapest payment today is not always the least expensive loan. The right choice starts with an honest timeline, a clear look at the caps, and a purchase contract built to support the financing.

That is where Jeff Hernandez, Esq., brings real value to a Scottsdale purchase. He reads contracts with the perspective of a licensed attorney, knows the North Scottsdale and Paradise Valley luxury markets closely, and helps buyers align the financing, the timeline, and the terms before they commit. With RETSY, Forbes Global Properties, behind him, buyers relocating from out of state gain both local depth and a global network.

To talk through your purchase, call (602) 550-1114 or email jeff@conniecollagroup.com. For more on avoiding costly missteps, read about the biggest homebuying mistakes in Scottsdale's luxury market.

Disclosure: Jeff Hernandez, Esq., is a licensed Arizona attorney and a licensed REALTOR. He is not acting as your attorney in a real estate transaction unless a separate attorney-client relationship has been established in writing. Jeff Hernandez does not provide legal advice in his capacity as a REALTOR. This article is general information and is not lending or financial advice; consult a licensed mortgage professional about your specific loan.