What is an adjustable-rate mortgage (ARM)?

An adjustable-rate mortgage (ARM) is a home loan with an interest rate that stays the same for a set number of years, then changes on a regular schedule. The first few years often come with a lower rate than a fixed-rate mortgage, which can mean a smaller monthly payment early on. After that, your rate can rise or fall with the market, within limits called caps.

An ARM can be a smart tool if it fits your timeline and budget. It can also cost more if rates climb and you keep the loan longer than planned. Here’s how ARMs work, what the terms mean, and how to tell if one is right for you.

Key takeaways:

• An ARM starts with a fixed rate for a set period, then adjusts on a regular schedule.
• Your new rate is based on a market index plus a margin, and caps limit how much it can change.
• An ARM may work best if you plan to sell or refinance before the fixed period ends and could still afford the highest possible payment.

ARM definition

An ARM is a mortgage with two phases. First is a fixed phase, during which your rate stays the same. After that comes an adjustable phase, when your rate can change based on market conditions. A fixed-rate mortgage, by contrast, keeps the same rate for the life of the loan, according to the Consumer Financial Protection Bureau (CFPB).

How does an ARM work?

It helps to think of an ARM as a timeline. Here’s what happens, step by step:

1. Introductory period. Your rate is locked for the first few years. This often lasts 3, 5, 7, or 10 years.
2. Adjustment period. Once the fixed period ends, your rate can change.
3. Rate reset. Your lender figures out your new rate on a set schedule, usually every 6 or 12 months.
4. Payment change. Your monthly payment goes up or down based on your new rate.

An ARM adjustment can cause your rate and payment to fall. Some loans have a floor that limits how low the rate can go.

What do ARM numbers mean?

ARMs usually come with two numbers, like 5/1 or 7/6. The first number tells you how many years your rate stays fixed. The second tells you how often it can change after that.

• A 5/1 ARM has a fixed rate for 5 years, then adjusts once a year.
• A 5/6 ARM has a fixed rate for 5 years, then adjusts every 6 months.
• A 7/6 ARM and 10/6 ARM work the same way, with 7- and 10-year fixed periods.
• A 7/1 or 10/1 ARM adjusts yearly after its fixed period. You can compare them side by side in our breakdown of 5/1 vs. 7/6 vs. 10/6 ARMs.

How are ARM rates determined?

When your rate resets, your lender adds two pieces together: an index and a margin. The index is a market benchmark, such as the Secured Overnight Financing Rate (SOFR) or the prime rate. The margin is a set percentage your lender adds on top. Your caps then limit how much that new rate can change.

Your starting rate depends on more than just the market. Your credit, down payment, loan type, property, and lender all play a role. You’ll find your index, margin, and caps on your Loan Estimate.

Common ARM terms to know

ARM paperwork uses terms you may not see with other loans. Here’s a quick guide.

• Introductory period: The number of years your rate stays fixed.
• Adjustment period: How often your rate can change after the fixed period ends.
• Index: A market benchmark that moves with the market. Your loan documents name which index your ARM follows.
• Margin: A set percentage your lender adds to the index. This usually doesn’t change over the life of the loan.
• Fully indexed rate: The index plus the added margin. This is the rate you’d pay at reset, before caps apply.

ARM rate caps and floors

Interest rate caps protect you from big jumps. According to the CFPB, there are three main types:

• Initial adjustment cap. Limits how much your rate can change at the first reset.
• Subsequent adjustment cap. Limits how much your rate can change at each reset after that.
• Lifetime adjustment cap. Limits how much your rate can rise from your starting rate over the life of the loan.

Caps are often written as three numbers, like 2/2/5. That means your rate can rise up to 2% at the first reset, up to 2% at later resets, and no more than 5% total.

An interest rate floor is the lowest your rate can go. Keep in mind that caps only limit change. They don’t stop your payment from going up.

ARM rates today

As of late 2026, a standard 5/1 ARM with Rocket Mortgage hovers around 6.99%. Rates change daily, so check today’s mortgage rates for the latest numbers.

Remember that the rate you’re offered may differ. It depends on your credit, down payment, property, loan structure, the market, and your lender. When you compare current ARM rates, don’t just look at the starting rate. Check the index, margin, caps, floor, fees, and how an ARM compares against a fixed-rate loan.

ARM vs. fixed-rate mortgage

Neither loan is better for everyone. It comes down to your plans and how much change you’re comfortable with.

Types of ARMs

ARMs come in a few forms. Each one handles payments in its own way.

Hybrid ARMs

Hybrid ARMs, the most common type, blend a fixed period with an adjustable one. A 5-year ARM gives you the shortest fixed period and often the lowest starting rate. A 7-year ARM gives you a bit more time. 10-year ARMs offer the longest stretch of stable payments, though their starting rate is often a little higher. ARMs are available for some government-backed loans, too, like the FHA ARM (Federal Housing Administration) and VA ARM (Department of Veterans Affairs).^{1, 2}

Interest-only ARMs

With an interest-only ARM, you only have to worry about paying interest for the first few years. This keeps early payments low, but you won’t build home equity through payments during that time. Once that period ends, you start paying the principal, too, leading to a sharp increase in your monthly payment.

Payment-option ARMs

A payment-option ARM lets you choose how much to pay each month, sometimes including a minimum payment. If that payment doesn’t cover the interest you owe, the unpaid amount gets added to your balance. This is called negative amortization, and can result in you owing more than you borrowed.

Example of an ARM

Here’s a hypothetical example, using made-up rates for simplicity.* Say you take out a $350,000, 30-year 5/1 ARM with a 5.5% starting rate and 2/2/5 caps. Your monthly principal and interest could change like this if rates rise as high as the caps allow:

• Years 1 – 5 at 5.5%: About $1,987 a month
• Year 6 at 7.5%: About $2,391 a month
• Year 7 at 9.5%: About $2,816 a month
• Year 8 on at 10.5% (lifetime cap): About $3,034 a month

In this worst-case scenario, your payment would rise by about $1,047 a month. Rates could also stay level or fall. Try the Rocket Mortgage payment calculator to test your own numbers.

Pros and cons of ARMs

Here’s a quick look at some of the pros and cons of using ARMs:

How to qualify for an ARM

ARM requirements look a lot like those for other mortgages. Exact rules depend on the loan type and lender, but you’ll often need:

• A credit score of at least 620, depending on the loan and lender
• A down payment of at least 5%
• A debt-to-income ratio (DTI) no higher than 43% – 50%
• Enough cash reserves to cover a few months of payments
• Money for closing costs, often 3% – 6% of the purchase price
• Proof of steady income and on-time payment history

Lenders might also make sure you could afford to make payments at the fully indexed rate, not just the starting rate.

Should you get an ARM?

An ARM can be a good fit, but make sure it matches your life goals. Think about how long you’ll stay in the home, whether you plan to sell or refinance, and how you’d handle a higher payment. Most of all, make sure you can afford the highest payment your caps allow.

When an ARM may make sense

An ARM may work well if you:

• Plan to sell before the fixed period ends
• Expect to refinance before your first reset
• Think rates may drop in the future
• Have room in your budget for a higher payment

When an ARM may be risky

So, is an ARM a bad idea? Not on its own, but it can be the wrong choice for some people. An ARM may be risky if you plan to stay in your home long term, your budget is tight, or you need a consistent payment structure. Today’s rates are just one piece of the puzzle. Your personal plans matter more than the market.

Is a 5-year ARM a good idea?

A 5-year ARM may make sense if you expect to move, sell, or refinance within 5 years and could still afford the payment if it resets higher. The risk is counting on a plan that might change. Home values might drop, rates can rise, and refinancing isn’t guaranteed. If those things happen, you could be on the hook for a higher payment.

FAQ

Here are the answers to some common questions about ARMs.

What is the current adjustable mortgage rate?

As of late 2026, standard 5/1 ARMs at Rocket Mortgage hover around 6.99%. Rates change often, so compare current mortgage rates and get a personal quote for the most accurate number.

What’s the difference between conforming and nonconforming ARMs?

A conforming ARM follows rules set by Fannie Mae and Freddie Mac, including loan limits. A nonconforming ARM, like a jumbo loan, doesn’t meet those rules. It may come with different rates and stricter requirements.³

What happens if I pay off my ARM early?

Once you pay off your loan, your lender releases the lien on your home, and you own it outright. Check your loan documents first, since some loans charge a prepayment penalty.

How do I apply for an ARM?

You’ll need to provide details about your income, savings, taxes, and credit. Ready to see your options? You can apply for an ARM with Rocket Mortgage online.

What happens if I can’t afford my ARM after rates reset?

Reach out to your lender as soon as you can. You might be able to refinance, sell your home, or ask about a loan modification. The sooner you ask, the more options you may have.

When should I refinance my ARM?

Many people refinance an ARM before the fixed period ends to lock in a steady payment. It may also make sense if you’d simply rest easier with a fixed rate.⁴ Keep in mind that approval and future refinance rates aren’t guaranteed. Some borrowers choose a convertible ARM that allows you to switch to a fixed one later on.

The bottom line: Is an ARM right for you?

An adjustable-rate mortgage can give you a lower starting rate and payment, but it also comes with more uncertainty once the fixed period ends. Before you choose one, compare the index, margin, caps, fees, and highest possible payment against a fixed-rate loan.

When you’re ready to take the next step, you can confidently start an application with Rocket Mortgage.

* Any figures, interest rates, loan examples, and market data referenced in this article are hypothetical or aggregated for educational purposes only. They are not intended to reflect current pricing, available terms, or personalized loan options for any consumer. This content does not constitute an advertisement of credit terms, a solicitation or offer to extend credit, or a rate quote under federal or state lending laws. Actual mortgage rates and terms are determined by individual financial qualifications, property characteristics, market conditions, and other factors, and are subject to change without notice. If you are seeking current, real-time mortgage rate information please refer to the official live rate information and product details published at RocketMortgage.com/mortgage-rates, where current pricing and various loan terms are made available.

¹ Rocket Mortgage is not acting on behalf of FHA or HUD.

² Rocket Mortgage is a VA-approved lender, not endorsed or sponsored by the Dept. of Veterans Affairs or any government agency.

³ Rate pricing and closing costs dependent on loan qualification requirements and factors including but not limited to credit, income, assets, down payment, product selection and loan amount. This is not a commitment to lend.

⁴ Refinancing may increase finance charges over the life of the loan.

This article is for informational purposes only and is not intended to provide, and should not be relied on for, medical, legal, financial, investment, or tax advice. You should consult a qualified professional for advice specific to your situation. Consumers should independently verify that any services, products, or programs referenced meet their needs and comply with applicable requirements.

Rocket Mortgage is a trademark or service mark of Rocket Mortgage LLC or its affiliates.