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What is an Adjustable-Rate Mortgage (ARM) Loan?


An adjustable-rate mortgage (ARM) is a home loan that begins with a fixed interest rate for an introductory period and then adjusts periodically based on current market conditions. After the initial fixed term ends, the interest rate can increase or decrease depending on a financial index, which means your monthly payment may change over time. ARMs are often chosen by borrowers who don’t plan to stay in their home long-term or who expect rates to fall or their income to rise in the future. When used strategically, ARMs can provide significant savings during the early years of the loan compared to traditional fixed-rate mortgages.

Key Features of Adjustable-Rate Mortgage (ARM) Loans:


  • Lower starting interest rates compared to fixed-rate mortgages
  • Initial fixed-rate period (commonly 3, 5, 7, or 10 years)
  • Interest rate adjusts after the fixed period ends
  • Adjustment is based on a benchmark index plus a margin
  • Rate caps limit how much the rate can increase per adjustment and over the life of the loan
  • Can result in lower initial monthly payments
  • Suitable for short-term homeowners or anticipated refinancers
  • Offers flexibility in changing rate environments
  • Available for primary homes, second homes, and investment properties

Types of Adjustable-Rate Mortgages (ARMs)


  • 3/1 ARM – Fixed for 3 years, then adjusts annually
  • 5/1 ARM – Fixed for 5 years, then adjusts annually
  • 7/1 ARM – Fixed for 7 years, then adjusts annually
  • 10/1 ARM – Fixed for 10 years, then adjusts annually
  • Interest-Only ARM – Allows interest-only payments for a set period before principal payments begin
ARM Mortgage options

Frequently Asked Questions – ARM Loans

1. What is an ARM loan?

An ARM (Adjustable-Rate Mortgage) is a home loan with an interest rate that can change periodically after an initial fixed-rate period. This means your monthly payment may go up or down over time.

2. How does an ARM work?

ARM loans start with a fixed interest rate for a set period (e.g., 5, 7, or 10 years). After that, the rate adjusts at regular intervals based on a market index plus a margin.

3. What do the numbers in ARM terms mean (e.g., 5/1 ARM)?

The first number indicates the length of the initial fixed-rate period (5 years), and the second number shows how often the rate adjusts afterward (every 1 year).

4. Why choose an ARM over a fixed-rate mortgage?

ARMs often start with lower interest rates than fixed-rate loans, making them attractive for buyers who plan to sell or refinance before the adjustment period begins.

5. What are the risks of an ARM loan?

Your interest rate and monthly payment can increase after the fixed period, which may affect affordability if rates rise significantly.

6. Are there caps on how much the rate can increase?

Yes. ARMs typically have caps that limit how much the interest rate can rise per adjustment and over the life of the loan.

7. What factors influence ARM adjustments?

Adjustments are based on a market index (like SOFR or Treasury rates) plus a fixed margin set by the lender.

8. Who is a good candidate for an ARM loan?

Borrowers who expect to move, sell, or refinance within the initial fixed period often benefit most from ARMs.

9. Can I refinance an ARM into a fixed-rate mortgage later?

Yes. Many borrowers refinance before the adjustment period to lock in a stable rate.

10. What are the pros and cons of ARM loans?

Pros: Lower initial rates, potential savings if rates stay low
Cons: Payment uncertainty, risk of higher rates later

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