Adjustable mortgage rates: A guide to your first reset

When you buy a home with an adjustable-rate mortgage (ARM), you get to enjoy the predictability of a lower initial interest rate for the first few years. However, as that initial fixed period comes to an end, it’s completely normal to think ahead to your first rate reset and wonder how it will ultimately affect your finances.

Depending entirely on current market conditions, adjustable mortgage rates and the corresponding monthly payment could go up or down when the first ARM adjustment occurs.

Understanding the how, when, and what of your first ARM adjustment can help you evaluate its impact on your budget as well as your options moving forward.

How do adjustable-rate mortgages work?

In an ARM vs. fixed-rate mortgage comparison, a fixed-rate loan maintains the exact same interest rate for its entire term. An ARM starts with an initial fixed rate for a set period, followed by potential rate adjustments based on the loan’s terms and current market conditions.

You’ll want to be familiar with a few key ARM terms:

• Index and margin: Your new interest rate is determined by taking a benchmark interest rate (the index) and adding a fixed percentage determined by your lender (the margin).
• Adjustment interval: This dictates how frequently your interest rate can change after the initial fixed period ends, such as every 6 months or once a year.
• Rate caps: These limits protect you from extreme rate shock. The initial cap limits the very first rate adjustment, the periodic cap limits all subsequent adjustments, and the lifetime cap restricts how high the rate can climb over the life of the loan.
• Interest rate floor: This is the absolute lowest your interest rate can fall, no matter how far the index drops. The rate will also never fall below the margin.

ARMs are typically identified by two numbers. For example, a 5/1 ARM means the rate is fixed for 5 years and adjusts once a year after that. A 7/1 ARM is fixed for 7 years and adjusts annually, while a 7/6 ARM is fixed for 7 years and adjusts every 6 months.

What happens when your ARM rate resets?

Your mortgage servicer is legally required to notify you of your upcoming initial adjustment between 210 – 240 days before the first adjusted payment is due.

In this notice, you’ll see a table specifying your current interest rate and monthly payment directly next to your new rate and monthly payment. The letter will also explicitly state the exact date on which the new payment becomes effective.

When your lender calculates your new rate at the reset, they add the index level to your margin while applying any interest rate caps or floor if necessary. Because this adjustment is purely contractual, your credit score, household income, or property value won’t impact the new rate calculation at all.

Instead, broader market conditions affect whether the index goes up or down. Major economic factors – such as inflation, Federal Reserve decisions, economic growth, and bond yields drive benchmark indexes like the Secured Overnight Financing Rate (SOFR) and Constant Maturity Treasury (CMT).

Example of ARM rate reset

To see how this math works, let's look at a hypothetical first ARM rate reset for a $350,000 VA 5/1 ARM.¹ Here are the details of the loan:

• Initial interest rate: 5.125% (5.815% APR)²
• Current CMT index: 3.73%
• Margin: 2%
• Initial adjustment cap and floor: 1%
• Periodic cap and floor: 1%
• Lifetime cap and floor: 5%

Assuming all payments are made as scheduled with no additional principal payments, your mortgage balance at the end of 5 years is $321,966.13.

Your new mortgage rate is determined by adding the index and margin together. In this case, your new rate becomes 5.73%. Because this is only a 0.605% increase over your initial rate, it easily falls within your 1% initial adjustment cap. This makes your new monthly payment $2,021.62.

You can estimate your own scheduled mortgage payment change by using a mortgage calculator.

How can an ARM rate reset affect your finances?

A change in your ARM rate can have a positive or negative effect on your finances in both the short and long term. Here are areas to think about when considering the adjustment.

• Monthly budgeting and cash flow: If your rate increases, your monthly payment will go up, giving you less disposable income. If it goes down, you’ll have extra cash in your monthly budget.
• Interest cost over time: A higher interest rate increases the total amount you’ll spend on interest over the life of the loan. You may be able to mitigate this by making additional payments toward the principal. Understanding how mortgage interest works is key to managing your long-term wealth.
• Financial stability: Adjustable rates result in less predictable payments over time, which can make consistent long-term financial planning slightly more challenging.
• Long-term financial goals: Absorbing a higher mortgage payment might require you to temporarily shift cash away from other goals, like retirement savings or building an emergency fund.
• Risk of foreclosure: If an upward adjustment makes your payment completely unaffordable and no action is taken, you could eventually face the risk of foreclosure.

How to prepare for your first ARM adjustment

Because your lender notifies you months in advance, you don't have to wait until the last minute. We encourage home buyers to start preparing several months before their first ARM reset. Following these practical steps can help you get ready.

1. Review your loan documents

First, grab your Closing Disclosure and review it for key details. Locate your exact index rate, margin, adjustment intervals, rate caps, and your rate floor. If you have questions about the terms or can't find the information you need, reach out to your servicer.

2. Research current market conditions

Spend some time researching current economic conditions that could affect whether your rate rises or falls. Keep an eye on the prime rate, benchmark rates, Federal Reserve actions, inflation rates, and the broader conditions in the housing market.

Your specific benchmark index will be listed in documentation from your lender. While checking a mortgage interest rates forecast or exploring current mortgage rates is helpful, keep in mind that rate changes can't be predicted with absolute certainty. Researching things like the federal funds rate can still help you set realistic expectations.

3. Simulate potential mortgage payment changes

Use a mortgage calculator to estimate how your monthly payment might change with a rate increase or decrease, such as 1%. This will help you determine whether your post-adjustment mortgage payment still fits within your budget and guide you toward how you should proceed.

4. Weigh your options

You have multiple options to consider ahead of the first reset. Take the time to evaluate the pros and cons of each:

• Doing nothing: If your new rate goes down or the increased payment is comfortably affordable, simply accepting the rate reset might be the easiest path forward.
• Considering an ARM refinance: You can choose to refinance an ARM loan³ into a fixed-rate mortgage for a predictable payment, or into a new ARM. Use a refinance calculator to see if the closing costs make sense.
• Paying down the principal: Making an additional principal payment ahead of the rate reset lowers your loan balance, which can lead to a more affordable monthly payment when the new rate kicks in.
• Exercising the conversion feature: Some ARMs have a built-in conversion feature that allows you to switch to a fixed-rate loan for a fee, skipping the full refinance process. Check your paperwork to see if you have a convertible ARM loan.
• Selling your home: If the new payment is unaffordable or you're ready to relocate, selling the home before the rate resets is a practical option.

To decide which option is right for you, there’s no substitute for looking at your finances and doing the math. Consider not only your mortgage, but other financial goals you may have.

5. Prepare your finances accordingly

Once you’ve chosen your route, proactively prepare your finances. If you plan to make a change with your mortgage, review the cost to refinance and any refi requirements. If you decide to sell and buy a new house, plan your approach to your current market. Above all, make sure you think about your long-term financial goals.

FAQ about ARM adjustments

You’ve probably figured out by now that ARMs have their pros and cons, but let’s briefly answer some other questions you might have about adjustable-rate mortgages.

Could my ARM rate stay the same?

Yes, it’s entirely possible. If the index your loan is tied to remains flat, or if the movement is restricted by your rate caps or floor, your interest rate could stay exactly the same.

What if I can’t afford my ARM payment after the reset?

There’s an inherent risk of the interest rate going up during any ARM adjustment. You should be prepared for changes and ready to take a hard look at your budget.

But changes in life circumstances do happen. If you're anticipating having trouble with your mortgage payment at any time, you should contact your servicer for mortgage help. Rocket Mortgage clients can get in touch with us by navigating to the Help > Payment assistance option after signing into their Rocket Accounts.

Is it too late to refinance if my ARM rate already changed?

It’s never too late to refinance. Even if your rate has already adjusted, you can apply for a refinance to secure a fixed rate or better terms, as long as you meet the lender's current credit and equity requirements. You can evaluate whether you should refinance based on today's market rates.

Can an ARM rate hike lead to an underwater mortgage?

No, an ARM rate hike alone won't lead to an underwater mortgage. While a rate hike increases your monthly payment and interest costs, it doesn't increase your principal loan balance. An underwater mortgage typically happens when your property value drops below what you owe on the loan.

Is there a prepayment penalty for paying down my ARM before the rate adjusts?

Rocket Mortgage doesn’t charge a prepayment penalty for paying down ARMs before they adjust. If your loan is with another lender, check your closing documents or contact your servicer to confirm their specific policy.

The bottom line: Plan your finances early for adjustable mortgage rates

Navigating your first ARM reset doesn't have to be overwhelming. By understanding the mechanics behind ARM rate resets, you can easily estimate the impact on your monthly payment and interest costs. Take the time to review your loan documents, weigh your options, and align your decisions with your budget and long-term financial goals.

If you’re considering refinancing your ARM or taking out a mortgage on a new home, apply for a mortgage today.

¹ Rocket Mortgage is a VA-approved lender, not endorsed or sponsored by the Dept. of Veterans Affairs or any government agency.

² The payment on a $350,000 5-year VA adjustable-rate loan at 5.125% is $1,905.71. The annual percentage rate (APR) is 5.815% and the loan-to-value ratio (LTV) is 80% for the cost of 2 points ($7,000) due at closing. The rate is variable and subject to change after 5 years. One point is equal to one percent of the loan amount. Payment does not include taxes and insurance premiums. The actual payment amount will be greater. VA loans do not require PMI. Rates shown valid on publication date of March 23, 2026. Some state and county maximum loan amount restrictions may apply.

³ Refinancing may increase finance charges over the life of the loan.

This article is for informational purposes only and is not intended to provide financial, investment, or tax advice. You should consult a qualified financial or tax professional before making decisions regarding your retirement funds or mortgage.

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