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An adjustable-rate mortgage (ARM) comes with an interest rate that changes over time. Typically, you begin an ARM paying a lower, fixed rate for a set period of time. After that fixed-rate time expires, your rate adjusts to the market rate, either higher or lower. The most common types of ARMs include 3/1, 5/1, 7/1 and 10/1 loans.

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What is a 5/1 ARM?

A 5/1 ARM is one type of adjustable-rate mortgage. The “5/1” refers to the length of the fixed-rate period and the frequency of rate changes, respectively. The “5” is the fixed-rate period of the mortgage — the first five years. The “1” is how often the interest rate adjusts after that — once per year.

Another common mortgage is the 5/6 ARM, which adjusts every six months after the initial five-year period.

How does a 5/1 ARM loan work?

The clock starts ticking on your 5/1 ARM as soon as you close the loan. If you were to close the mortgage in July 2024, for example, your rate wouldn’t change again until July 2029.

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When this adjustment happens, the lender recalculates the interest on your loan going forward depending on how the rate has changed, up or down. One year later, your loan will adjust again, and the process will repeat to the end of the loan term. If your rate goes up, your monthly payment will also go up. The inverse is also true.

ARMs are uniquely structured to allow for a lower introductory rate and subsequent adjustments, but your rate can’t just keep climbing indefinitely. On your closing documents, you’ll see the following:

Introductory or “teaser” rate: This refers to the interest rate you’ll pay during the initial fixed-rate period.
Adjustment intervals: This indicates the frequency at which the rate can change. It can also be referred to as the reset date.
Initial adjustment cap: This cap is the maximum amount by which the rate can rise at the first adjustment, often 2 or 5 percentage points higher than the initial rate.
Periodic rate cap: The periodic rate cap, also called the subsequent adjustment cap, is the maximum amount by which the rate can change each time it resets, typically 2 percentage points higher than the prior rate.
Lifetime cap: This is the maximum amount by which the rate can change over the life of the loan. This varies by lenders, but is generally 5 percentage points.

Knowing the caps on how much your interest rate could increase can help you plan and budget for future payments after the initial fixed-rate period ends. Alternatively, if you think you wouldn’t be able to afford higher payments, then exploring a fixed-rate loan might be a better option.

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You can use our adjustable-rate mortgage calculator to estimate your monthly payments and see how they might change over the loan’s term.

What index does the 5/1 ARM use?

The index is a major factor in determining the rate you pay on your ARM. ARMs are typically tied to the 11th District Cost of Funds Index (COFI) or the Secured Overnight Financing Rate, also known as SOFR. You can find out the specific index your lender uses on your loan estimate paperwork. If the yield on that index increases, your ARM rate also increases.

Pros and cons of a 5/1 ARM

How 5/1 ARMS compare to other loans

5/1 ARM vs. other ARMs: Other ARMs, such as a 10/1 or 7/1 ARM, work in a similar way to 5/1 ARMs, except the length of the initial fixed-rate period and the interest rate will differ. For a 10/1 ARM, the initial rate is fixed for the first decade rather than five years, and for a 7/1 ARM, the initial rate adjusts after the first seven years. Rates likely will be slightly higher on a 10/1 and 7/1 ARM compared to a 5/1 ARM because they have longer introductory fixed-rate periods.
5/1 ARM vs. fixed-rate mortgage: The introductory fixed rate on a 5/1 ARM is often considerably lower than the one on a 30-year fixed-rate loan. That translates to a lower monthly payment, at least initially. Of course, the drawback is uncertainty. After five years, your ARM rate and monthly payment could rise. With a fixed-rate loan, you’ll know exactly how much you’ll pay over the life of the loan, making the payments easier to budget for.

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When to consider a 5/1 ARM loan

If you’re in the market for a mortgage, a 5/1 ARM might be a good fit in a few situations:

You plan to refinance or sell soon. If you don’t plan to keep the loan for more than five years, you’ll never deal with a rate adjustment. You’ll need to have a concrete plan for how you’ll get out of the loan, however, whether that’s moving or refinancing. If you want to refinance, keep in mind you’ll need to be able to qualify for it, as well as pay closing costs.
You expect your income to increase over time. If you know you’ll be bringing in more income five years from now, you might be able to handle a potential increase in payment. This might be the case if you’re a doctor just coming out of medical school, for example, or in some other similar profession with a lucrative earnings horizon.
Your budget supports the maximum payment. If you’re well off financially, a bump in rate and payment might not matter much in your budget. This lowers the risk of rate adjustments considerably — but it also means you might not have as much left over for other financial goals, like investing or saving for retirement.