Adjustable-Rate Mortgages: Are the Savings Worth the Risk for West Michigan Buyers?
By Sam Avila, Associate Broker, ABR
Avila Home Group | Keller Williams Grand Rapids East
A lower mortgage payment can make a home purchase feel more manageable. But when that payment comes with an adjustable interest rate, you need to understand what happens beyond the first few years.
In her October 7, 2026, Realtor.com article about adjustable-rate mortgages, Allaire Conte explores why these loans are attracting renewed attention.
The article reports that, in late September, the Mortgage Bankers Association’s average 30-year fixed mortgage rate was 7.30%, compared with 6.47% for a 5/1 adjustable-rate mortgage.
That difference can create meaningful introductory savings. However, it also raises an important question:
Can your budget handle the mortgage if the rate increases later?
For buyers in West Michigan, the decision deserves more than a glance at the starting payment.
What is an adjustable-rate mortgage?
An adjustable-rate mortgage, or ARM, is a home loan whose interest rate can change according to the loan agreement.
Many ARMs begin with a fixed interest rate for a specified period. After that, the rate adjusts at scheduled intervals.
A fixed-rate mortgage keeps the same interest rate throughout its term. An ARM may offer a lower introductory rate in exchange for uncertainty about future payments. www.consumerfinance.gov
That makes an ARM a financing option to evaluate carefully—not an automatic bargain.
What do 5/1 and 5/6 mean?
The numbers describe the introductory period and the adjustment schedule.
Loan structureInitial fixed-rate periodAdjustments afterward5/1 ARMFive yearsEvery year5/6 ARM, sometimes written 5/6mFive yearsEvery six months7/6 ARMSeven yearsEvery six months
The introductory period is different from the repayment term. For example, a five-year introductory rate can be part of a mortgage with a 30-year repayment schedule. Always confirm the lender’s written terms. files-prod.consumerfinance.gov
How much could the lower starting rate save?
Using the rates reported in the Realtor.com article, consider this example:
Purchase price: $400,000
Down payment: $80,000, or 20%
Mortgage amount: $320,000
Repayment term: 30 years
Mortgage optionStarting rateApproximate monthly principal and interestFixed-rate mortgage7.30%$2,194Adjustable-rate mortgage6.47%$2,016Initial difference—$178 per month
Over five years, that difference adds up to approximately $10,651 in lower principal-and-interest payments, before accounting for differences in upfront costs.
These calculations use the article’s historical rates for illustration. They are not current lender quotes and exclude property taxes, homeowners insurance, HOA charges, and any applicable mortgage insurance.
For a household working to preserve cash reserves, $178 per month matters. The next step is understanding what you’re accepting in exchange.
Compare the fees as well as the rate
A lower rate does not always come with the same upfront costs.
Conte’s article reports higher points and origination fees for the ARM in the cited survey: 1.20 points versus 0.75 points for the fixed-rate loan.
Applied to a $320,000 mortgage, that 0.45-percentage-point difference equals approximately $1,440.
At roughly $178 in monthly payment savings, it takes about eight months to recover that additional upfront cost through payment savings alone.
That is a simple comparison, not a complete measure of the loans’ lifetime costs. Actual offers may have different fees, credits, and terms.
Ask lenders to compare the same loan amount, repayment term, and pricing date so you can see what the lower rate actually costs.
What happens when the rate adjusts?
An ARM’s adjusted rate generally depends on two components:
Index: A reference interest rate that changes with market conditions.
Margin: The percentage points added to the index, as specified in your loan agreement.
The index plus the margin produces the fully indexed rate, subject to the loan’s adjustment limits and other terms.
For example, a 4% index plus a 2.75% margin produces a fully indexed rate of 6.75%. Your actual rate change depends on your contract. www.consumerfinance.gov
You are agreeing to a calculation method—not simply to whatever mortgage rate appears in the headlines later.
How high could the payment go?
ARMs typically have caps that limit rate changes. These include limits on the first adjustment, later adjustments, and the total increase over the loan’s life. Some loans also have a minimum rate, called a floor. www.consumerfinance.gov
The Realtor.com article illustrates a 5/6 ARM with a 2/1/5 cap structure:
CapMeaning in this example2The first increase is limited to two percentage points1Later increases are limited to one percentage point per adjustment5The lifetime increase is limited to five percentage points above the initial rate
Starting at 6.47%, that example allows a first adjusted rate as high as 8.47% and an eventual lifetime ceiling of 11.47%.
These are illustrative terms. Your proposed loan may have different caps.
Using the $320,000 mortgage example, a first adjustment to 8.47% after five years would produce an estimated principal-and-interest payment of approximately $2,405.
That is about $389 more per month than the introductory payment.
The calculation assumes regular payments during the first five years, no extra principal payments, a remaining balance of approximately $299,452, and 25 years left to repay the loan.
The cap tells you how far the rate can move. Your budget tells you whether that movement is manageable.
Accumulated savings and monthly affordability are different
One useful point in the Realtor.com article is that an ARM borrower can build savings before the first adjustment. Those earlier savings may offset some higher costs later.
But being ahead in a long-term comparison does not necessarily mean the new monthly payment is comfortable.
You could save money for several years and still struggle when the payment increases.
A practical approach is to calculate both:
The potential financial advantage over your expected ownership period.
The highest payment your budget might need to support.
The second number should receive plenty of attention before you sign.
Can you just refinance before it adjusts?
Refinancing may be possible, but it is not guaranteed.
You still need to qualify for a new loan. Your income, credit, home value, available programs, and refinancing costs can change. The CFPB cautions buyers against assuming they can sell or refinance before an ARM’s rate changes. www.consumerfinance.gov
If the financing only works because you expect a future refinance, slow down and review the backup plan.
A useful question is:
If I keep this mortgage longer than expected, can I still afford the payment?
Life has a habit of editing our five-year plans without sending a calendar invitation.
What West Michigan buyers should consider
Whether you’re purchasing in Grand Rapids, Wyoming, Kentwood, Hudsonville, or another West Michigan community, start with the complete cost of ownership.
Include estimated taxes, insurance, utilities, maintenance, and any HOA expenses. If you’re selling and buying, account for moving costs and possible overlap between homes.
Use the Avila Home Group Calculator Center to explore payment assumptions. Have your lender calculate ARM adjustments using the actual loan terms.
The West Michigan Buyer Guide can also help you prepare for the broader purchase process.
An ARM may deserve consideration when the savings are meaningful, you understand the terms, and you can handle potential increases. A fixed-rate mortgage may fit better when predictable principal-and-interest payments are a priority.
Questions to ask your lender
Before choosing an ARM, ask:
When does the introductory rate end?
How often does the rate adjust afterward?
What are the index, margin, caps, and floor?
What is the highest possible principal-and-interest payment?
How do points, fees, and APR compare with a fixed-rate offer?
Are there prepayment penalties or other special features?
What happens if I stay longer than planned?
Review the Loan Estimate and ARM disclosures with your lender until the answers are clear. www.consumerfinance.gov
Sam’s perspective
A lower starting payment can create breathing room, but the mortgage needs to work beyond the introductory period. My role is to help you connect your home search to your goals and coordinate with your lender so you can compare the full picture. Every move begins with a plan—and a good plan leaves room for life to change.
Frequently asked questions
Is an adjustable-rate mortgage always cheaper?
No. Its initial payment may be lower, but fees, future adjustments, and how long you keep the loan affect the overall cost.
Can an ARM’s interest rate decrease?
It may, depending on the index and loan terms. A floor or other limits can restrict decreases. www.consumerfinance.gov
Does a fixed-rate mortgage guarantee the same total monthly payment forever?
Its interest rate stays fixed, but taxes, insurance, and other housing expenses can change.
Is an ARM a reasonable option for a first-time buyer?
It can be considered alongside other available loans. Being a first-time buyer does not replace the need to understand the adjustment terms and assess future affordability.
Where can I learn more?
Read Allaire Conte’s October 7 Realtor.com article and the CFPB’s Consumer Handbook on Adjustable-Rate Mortgages.
Let’s put the options into perspective
You don’t have to choose a mortgage based on a headline or make your next move without a plan.
We can discuss your goals, organize your questions, and coordinate with your lender to compare financing options.
Book a call — virtual or in person.
Sam Avila, Associate Broker, ABR
Avila Home Group | Keller Williams Grand Rapids East
616-229-5082 | sam@avilahomegroup.com
Guidance available in English and Spanish.
Educational information only. Examples are not loan offers. Rates, eligibility, fees, and adjustment terms vary; confirm your financing with a licensed mortgage lender.
