An adjustable rate mortgage, often called an ARM, is a home loan with an interest rate that can change over time. For some buyers, an ARM can offer a lower initial rate or payment compared with a traditional fixed-rate mortgage. For others, the possibility of future payment changes may not be the right fit.
At FBKC Mortgage, we help borrowers understand both the opportunity and the risk. Whether you are comparing a 5/1 ARM, 7/1 ARM, 10/1 ARM, or a fixed-rate mortgage, our team helps you review your numbers, your timeline, and your comfort level before choosing a loan.
FBKC Mortgage describes an adjustable-rate mortgage as a home loan with an interest rate that can change over time, and highlights that a dedicated FBKC loan officer can help borrowers decide whether an ARM may offer flexibility or early-year savings. (Farmers Bank of Kansas City Mortgage)
Quick Answer: What Is an Adjustable-Rate Mortgage?
An adjustable-rate mortgage is a mortgage that usually starts with a fixed interest rate for an initial period. After that period ends, the rate can adjust based on the loan’s terms, market index, margin, and rate caps.
Common ARM options include:
- 5/1 ARM: Fixed rate for 5 years, then adjusts once per year
- 7/1 ARM: Fixed rate for 7 years, then adjusts once per year
- 10/1 ARM: Fixed rate for 10 years, then adjusts once per year
- 5/6 ARM or 7/6 ARM: Fixed for the first period, then adjusts every 6 months
The appeal of an ARM is often the initial rate or payment. The risk is that the payment may rise after the fixed period ends.
How an Adjustable-Rate Mortgage Works
An adjustable-rate mortgage usually has two main phases.
1. Initial fixed-rate period
During the initial period, your interest rate stays the same. This period may last 3, 5, 7, or 10 years, depending on the loan structure.
For example, with a 5/1 ARM, the rate is fixed for the first five years. With a 7/1 ARM, it is fixed for the first seven years. With a 10/1 ARM, it is fixed for the first ten years.
2. Adjustment period
After the initial fixed-rate period ends, the interest rate can adjust at scheduled intervals. The new rate is usually based on an index plus a margin, subject to limits called rate caps.
That means your monthly payment can go up or down depending on the loan terms and market conditions.
The Consumer Financial Protection Bureau explains that ARM rate caps can limit how much the rate can increase or decrease at the first adjustment, during later adjustments, and over the life of the loan. (Consumer Financial Protection Bureau)
What Do the Numbers Mean in a 5/1, 7/1, or 10/1 ARM?
The numbers in an ARM name tell you two things: how long the initial fixed-rate period lasts and how often the loan adjusts after that.
5/1 ARM
A 5/1 ARM has a fixed interest rate for the first five years. After that, the rate can adjust once per year.
This may appeal to buyers who expect to move, refinance, or pay down the loan before the first adjustment.
7/1 ARM
A 7/1 ARM has a fixed interest rate for the first seven years. After that, the rate can adjust once per year.
This option may work for buyers who want more initial stability than a 5/1 ARM but still want the possible early-year advantages of an ARM.
10/1 ARM
A 10/1 ARM has a fixed interest rate for the first ten years. After that, the rate can adjust once per year.
This can appeal to borrowers who want a longer fixed period but do not necessarily need a 30-year fixed-rate structure.
5/6 or 7/6 ARM
Some ARMs adjust every six months after the fixed-rate period. In these cases, the second number refers to the adjustment frequency after the initial fixed period.
Because ARM terms can vary, it is important to review the specific loan details before deciding.
Why Borrowers Choose Adjustable-Rate Mortgages
An ARM is not for everyone, but it can be useful in the right situation.
Lower initial rate or payment potential
Many borrowers consider an ARM because it may offer a lower initial interest rate or monthly payment compared with a fixed-rate loan. This can help with early affordability.
Shorter expected time in the home
If you expect to sell the home before the first adjustment, an ARM may align with your timeline. For example, if you plan to relocate within five to seven years, a 5/1 ARM or 7/1 ARM may be worth comparing.
Refinance strategy
Some borrowers choose an ARM because they plan to refinance before the adjustment period begins. This strategy can work, but it is not guaranteed. Future rates, home value, income, credit, and loan guidelines can all affect refinance options.
Income growth expectation
An ARM may appeal to borrowers who expect income to increase during the fixed period. Still, the payment should be affordable based on today’s budget, not only future assumptions.
Jumbo or higher-balance financing
In some higher-balance mortgage situations, ARM options may be part of the comparison. FBKC Mortgage offers jumbo loan options for high-value homes, and a mortgage advisor can help compare fixed and adjustable structures.
The Main Risk: Your Payment Can Change
The biggest thing to understand about an adjustable-rate mortgage is that your payment may increase after the fixed period ends.
Your payment could rise because of:
- A higher market index
- The loan’s margin
- Scheduled rate adjustments
- Escrow changes for taxes or insurance
- Mortgage insurance changes, if applicable
Rate caps may limit how much the interest rate can move, but they do not eliminate the possibility of a higher payment. The CFPB’s adjustable-rate mortgage resources are helpful for understanding how ARM changes and caps work before you commit. (Consumer Financial Protection Bureau)
ARM vs. Fixed-Rate Mortgage: Which Is Better?
The best choice depends on your timeline, budget, and tolerance for payment changes.
An adjustable-rate mortgage may be better if you:
- Expect to move before the first adjustment
- Want to compare a lower initial payment
- Are comfortable with future rate movement
- Understand the worst-case payment scenario
- Have a plan if rates increase
A fixed-rate mortgage may be better if you:
- Want long-term payment stability
- Plan to keep the home for many years
- Prefer a predictable principal and interest payment
- Do not want to manage future rate adjustments
- Are uncomfortable with payment uncertainty
A fixed-rate mortgage offers stability. An ARM offers flexibility and potential early savings, but with more future uncertainty.
How to Compare an Adjustable-Rate Mortgage
Before choosing an ARM, compare more than the starting rate.
1. Know the initial fixed period
Ask how long the starting rate lasts. A 5/1 ARM and a 10/1 ARM can feel very different because one gives you five fixed years and the other gives you ten.
2. Understand the adjustment frequency
Find out how often the rate can change after the initial period. Some ARMs adjust annually, while others may adjust every six months.
3. Review the index and margin
After the fixed period, the new rate is typically based on an index plus a margin. Your loan officer can explain what index applies and how the margin works.
4. Ask about rate caps
Review the initial cap, periodic cap, and lifetime cap. These limits help define your potential payment range.
5. Calculate the worst-case payment
Do not only compare the first payment. Ask what the payment could become if the rate adjusts upward within the loan’s cap structure.
6. Compare against fixed-rate options
Use the FBKC Mortgage Calculator to test different terms, then review today’s mortgage rates and personalized options with a loan officer.
When an Adjustable-Rate Mortgage May Make Sense
An ARM may be a strong fit for borrowers who have a clear short- to mid-term plan.
It may make sense if you:
- Plan to sell before the first adjustment
- Expect to relocate for work or family
- Want to compare lower initial payment options
- Are comfortable reviewing rate caps and payment scenarios
- Have strong savings or income flexibility
- Want a mortgage strategy that matches a shorter homeownership timeline
For example, a buyer who expects to move in six years may compare a 7/1 ARM against a 30-year fixed mortgage. If the ARM provides a lower initial payment and the buyer is likely to sell before the first adjustment, it may be worth considering.
When an ARM May Not Be the Right Fit
An ARM may not be ideal if you want maximum predictability.
You may prefer a fixed-rate mortgage if you:
- Plan to stay in the home long term
- Have a tight monthly budget
- Would be stressed by future payment changes
- Do not want to refinance later
- Prefer a “set it and forget it” mortgage structure
- Are uncomfortable with rate caps, indexes, or adjustment timelines
A mortgage should support your life, not create uncertainty you cannot comfortably manage.
How FBKC Mortgage Helps You Choose With Confidence
FBKC Mortgage combines community-bank values with modern lending tools to help borrowers compare options clearly. With more than a century of banking expertise behind the brand, FBKC Mortgage brings relationship-based guidance to buyers across the country. FBKC describes itself as combining 118 years of community banking expertise with modern mortgage technology. (Farmers Bank of Kansas City Mortgage)
When you work with FBKC Mortgage, you can expect:
- Clear ARM and fixed-rate comparisons
- Personalized payment scenarios
- Guidance from a dedicated mortgage professional
- Help understanding rate caps, adjustment periods, and long-term risk
- Online tools for comparing affordability and mortgage payments
- Long-term support through the Customer for Life program
You can also explore FBKC’s home purchase mortgage options, review the mortgage process overview, or get a personalized rate quote through FBKC’s online mortgage tools.
Bottom Line
An adjustable rate mortgage can be a useful loan option for borrowers who want potential early-year savings, expect to move or refinance before the adjustment period, and are comfortable understanding future payment changes.
The key is to compare the full loan structure, not just the starting rate. Review the fixed period, adjustment schedule, index, margin, caps, and worst-case payment before deciding.
Start with the FBKC Mortgage Calculator, review today’s mortgage rates, and connect with FBKC Mortgage to compare ARM and fixed-rate options side by side.
FAQs About Adjustable-Rate Mortgages
What is an adjustable-rate mortgage?
An adjustable-rate mortgage is a home loan with an interest rate that can change after an initial fixed-rate period. The new rate is usually based on an index plus a margin, subject to the loan’s rate caps.
What does 5/1 ARM mean?
A 5/1 ARM has a fixed interest rate for the first five years. After that, the interest rate can adjust once per year, depending on the loan terms and market conditions.
What is the difference between a 7/1 ARM and a 10/1 ARM?
A 7/1 ARM has a fixed rate for seven years before annual adjustments begin. A 10/1 ARM has a fixed rate for ten years before annual adjustments begin.
Is an ARM better than a fixed-rate mortgage?
An ARM may be better for borrowers who expect to move or refinance before the first adjustment and are comfortable with future rate changes. A fixed-rate mortgage may be better for borrowers who want long-term payment stability.
Can an adjustable-rate mortgage payment go down?
Yes, an ARM payment may go down if the loan’s index decreases and the loan terms allow the rate to adjust downward. However, payments can also increase, so borrowers should review both possibilities.
What are ARM rate caps?
ARM rate caps limit how much the interest rate can change. There may be an initial adjustment cap, a periodic adjustment cap, and a lifetime cap.
Who should consider an adjustable-rate mortgage?
An ARM may be a good fit for borrowers who expect to sell, refinance, or move before the first adjustment period and who understand the possible future payment changes.
Recommended Internal Links Used
- FBKC Mortgage homepage
- FBKC Adjustable-Rate Mortgage Page
- Today’s Mortgage Rates
- Mortgage Calculator
- Home Purchase Mortgage Options
- Jumbo Loan Options
- Mortgage Process Overview
- Customer for Life Program
