Fixed vs. Adjustable-Rate Mortgages (ARM) : What’s The Difference?

9th May 2026

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While interest rates on adjustable-rate mortgages (ARMs) can fluctuate in response to general market conditions, interest rates on fixed-rate mortgages stay the same for the duration of the mortgage.

Find out more about the advantages and disadvantages of fixed-rate versus adjustable-rate mortgages with a detailed comparison between the two.

Purchasing a home is a major decision. Your payments are permanently impacted by the conditions, interest rate, and kind of loan you select.

There are two main types of mortgages that you will come across through your mortgage loan provider when applying for a home loan: fixed-rate mortgages and adjustable-rate mortgages (ARMs).

In today’s mortgage market, many borrowers compare ARMs and fixed-rate loans because adjustable-rate mortgages often begin with lower introductory interest rates.

However, choosing the right option depends on your financial goals, how long you plan to stay in the home, and your comfort level with changing monthly payments.

Difference Between Fixed and Adjustable Rate Mortgages

The primary distinction between a fixed-rate and an adjustable-rate loan lies in the stability of the interest rate. In a fixed-rate mortgage, the interest rate remains constant throughout the loan duration. In contrast, an adjustable-rate mortgage (ARM) allows for fluctuations in the interest rate, potentially changing multiple times during the loan period. Consequently, the monthly mortgage payment may vary based on the fluctuations in the underlying index.

There are additional aspects that set ARMs and fixed-rate loans apart. Let's delve into further details.

• Setting a Budget

Budgeting may become more challenging after an ARM reaches the adjusted phase since the monthly payment may fluctuate more frequently. On the other hand, a fixed-rate mortgage provides a consistent payment throughout the loan term.

• Rate of Interest

For a few years, at least, ARM interest rates are generally lower than those of fixed-rate loans. Since lenders must account for future market uncertainty when pricing fixed-rate loans, they often charge slightly higher interest rates for long-term payment stability.

With an adjustable-rate mortgage (ARM), lenders may offer a lower introductory rate during the initial fixed period. After that period ends, the rate can increase or decrease depending on market conditions and the loan terms.

• Qualifying

A mortgage company in Michigan considers both the monthly income and monthly expenses of your household when processing your mortgage application. While the lower introductory payment on an ARM may improve short-term affordability, many lenders qualify borrowers using the fully indexed rate or a higher estimated future payment to ensure they can manage future adjustments.

As a result, qualifying for an ARM and a fixed-rate mortgage often involves similar income, credit score, and debt-to-income (DTI) requirements.

Similarities Between Fixed and Adjustable Rate Mortgages

• Term Length

15-year and 30-year terms are available for both ARMs and fixed-rate loans. A longer term is typically the best choice if you want to minimize your monthly expenses.

• Refinancing

Both fixed-rate and adjustable-rate mortgages offer refinancing options. You can refinance into a fixed-rate mortgage if you have an ARM and wish to switch before the fixed period expires. Likewise, you can refinance later on if rates decline and you initially started with a higher fixed interest rate.

Fixed-Rate Mortgages vs. ARMs

There are a few major differences between adjustable-rate mortgages (ARMs) and fixed-rate mortgages, as one might expect. Here is a brief overview of both.

ARMs

Adjustable-rate mortgages (ARMs) begin with a fixed interest rate for a set introductory period, commonly 3, 5, 7, or 10 years. After that period ends, the interest rate can adjust periodically based on market conditions and the terms of the loan agreement.

For example, in a 5/1 ARM:

• The interest rate remains fixed for the first 5 years
• The rate may adjust once every year afterward

Because ARMs usually begin with lower interest rates than fixed-rate mortgages, they may help reduce monthly payments during the introductory period.

How ARMs Work

After an initial fixed-rate period, an adjustable-rate mortgage has an interest rate that varies at predetermined intervals. Three, five, seven, or ten years are the most popular intro periods. This first fixed interest rate is typically less than the interest rate on a typical fixed-rate mortgage.

Following the end of the introductory period, your rate will fluctuate at pre-arranged intervals, often every six months or annually. Modern ARMs are commonly tied to financial indexes such as the Secured Overnight Financing Rate (SOFR), which replaced LIBOR in the U.S. mortgage market.

Most ARMs calculate interest rates using:

Index + Margin = New Interest Rate

ARMs also include important protections and limits known as:

• Initial adjustment caps
• Periodic adjustment caps
• Lifetime caps

These caps limit how much your interest rate can increase over time.

Example of ARM vs. Fixed-Rate Mortgage Payments

Rates shown are examples only and may vary based on lender guidelines, credit score, market conditions, and loan eligibility.

Benefits of Adjustable Rate Mortgage (ARM)

• Lower Initial Interest Rates

Fixed-rate mortgages sometimes have higher initial interest rates than adjustable-rate mortgages (ARMs). An ARM usually has an interest rate that is lower than comparable fixed-rate mortgages during the introductory fixed-rate period, which can last anywhere from one to ten years.

During the first term, the monthly mortgage payments are reduced due to this lower rate.

• Reduced Monthly Installments

ARMs provide borrowers lower starting monthly payments than fixed-rate mortgages because of the lower introductory interest rates. Homeowners can use the savings for other expenses, emergency funds, investments, or home improvements.

• Potential for Lower Future Rates

Your ARM's interest rate may remain manageable after the promotional term, depending on market conditions. For example, if interest rates decline before your first adjustment period, your new rate and monthly payment could potentially decrease.

However, borrowers should also understand that rates can rise significantly in some economic conditions.

• Flexibility to Pay for Additional Costs

Since the beginning, monthly payments on an ARM are lower, and borrowers can use their money for other purposes or financial objectives. People who have conflicting financial goals, like paying off high-interest debt, saving for retirement or education, or making home renovation investments, can benefit from this flexibility.

Borrowers planning to move, refinance, or upgrade homes within a few years may also find ARMs appealing because they may benefit from the lower introductory rate without experiencing future rate adjustments.

Fixed-Rate Mortgages

The interest rate on a fixed-rate mortgage stays the same for the duration of the loan. The principal and interest amount you pay each month won't change, but the total amount you pay may vary based on changes in your homeowners' insurance and property taxes.

How Fixed-Rate Mortgages Work

Your monthly payment for principal and interest on a fixed-rate mortgage will remain the same unless you refinance, as the interest rate remains fixed throughout the loan term.

Although the most common durations for fixed-rate mortgages are 30 and 15 years, there are additional term alternatives available depending on the lender.

Even if your mortgage interest rate is fixed, your monthly payments may still change slightly over time because homeowners' insurance and property taxes are often included in the total mortgage payment. However, the portion of your payment covering principal and interest will not change.

Benefits of Fixed-Rate Mortgage

• Simplified Budgeting with Consistent Payments

The biggest advantage of a fixed-rate mortgage is that the amount you pay each month toward principal and interest remains consistent throughout the loan term.

However, your total payment may still adjust if homeowners' insurance premiums or property taxes increase or decrease.

• Protection Against Rising Interest Rates

One major benefit of a fixed-rate mortgage is protection from future market increases. Even if mortgage rates rise significantly over time, your interest rate and principal payment stay unchanged.

This predictability can provide peace of mind for homeowners planning long-term ownership.

• Over the Mortgage Term, Your Loan Is Fully Amortized

Another word you'll hear when learning about fixed-rate mortgages is "amortization." Mortgage loans usually have a set term that specifies when they must be fully repaid.

For instance, if you have a 30-year fixed-rate mortgage, it will be totally paid off after 30 years of timely monthly payments. Since the rate is fixed, you'll know exactly how much principal and interest you are expected to pay over the life of the loan.

Which One To Choose?

Fixed-Rate Mortgages Can Be Better If You:

• Aim to stay in the house for at least 10 years
• Prefer predictable monthly payments
• Want protection from future interest rate increases
• Are you a first-time homebuyer seeking a simpler mortgage option
• Have a strict monthly budget

Adjustable-Rate Mortgages Can Be Better If You:

• Plan to move or refinance before the fixed-rate period ends
• Can comfortably manage fluctuating monthly payments
• Expect future interest rates to remain stable or decrease
• Anticipate higher future income
• Want lower initial monthly mortgage payments

All In All

Given the wide variety of mortgage loans available, it's essential to research and evaluate your options carefully. In certain market conditions, especially when fixed mortgage rates are elevated, understanding the pros and cons of ARM may help borrowers reduce their initial monthly costs because introductory ARM rates are often lower than fixed-rate mortgage rates.

On the other hand, a fixed-rate mortgage may be the better choice if you value long-term payment stability and predictable budgeting. Fixed-rate mortgages are also generally easier for first-time homebuyers to understand and manage over time.

The right mortgage ultimately depends on:

• your financial goals
• your expected length of homeownership
• your tolerance for payment changes
• your future refinancing plans

Speaking with a trusted mortgage lender can help you compare available options and determine which loan type best fits your situation.

FAQs on Adjustable-Rate Mortgage Vs. Fixed-Rate Mortgage

1. How do fixed-rate and adjustable-rate mortgages differ from each other?

Your interest rate remains the same throughout the loan term with a fixed-rate mortgage. With an adjustable-rate mortgage, the interest rate can change after the initial fixed period based on market conditions and the loan’s index.

However, ARMs include adjustment caps that limit how much the interest rate can increase over time.

2. Which is easier to be approved for: an ARM or a fixed-rate mortgage?

Qualifying requirements for ARMs and fixed-rate mortgages are often similar. While ARMs may offer lower introductory payments, many lenders evaluate borrowers based on a higher projected payment after future rate adjustments.

Credit score, debt-to-income ratio, employment history, and down payment all play important roles in approval for either mortgage type.

3. With rising interest rates, which kind of mortgage is preferable?

That depends on your financial goals and how long you plan to stay in the home. Fixed-rate mortgages are often preferred by borrowers who want long-term payment stability, especially during periods of rising interest rates.

However, adjustable-rate mortgages may still appeal to borrowers seeking lower initial monthly payments or planning to move or refinance before the adjustable period begins.

4. Can you refinance an ARM into a fixed-rate mortgage?

Yes. Many homeowners refinance an ARM into a fixed-rate mortgage before the adjustable period begins, especially if they want more predictable monthly payments or if market conditions become uncertain.