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Adjustable-Rate Mortgage (ARM)

A mortgage where the interest rate changes periodically after an initial fixed-rate period. For example, a 5/1 ARM has a fixed rate for the first five years, then adjusts once per year based on a market index. ARMs usually start with a lower rate than fixed-rate mortgages, but your payment can go up or down when the rate adjusts. They can be a good choice if you plan to sell or refinance before the adjustable period begins.

Why It Matters

Adjustable-Rate Mortgage (ARM) is a concept every mortgage borrower should understand before signing loan documents. The terms of your mortgage — including factors like adjustable-rate mortgage (arm) — directly determine your monthly payment, total interest paid, and financial flexibility for the next 15-30 years. Taking time to understand these terms puts you in a stronger negotiating position with lenders.

When evaluating loan offers, ask your lender to explain how adjustable-rate mortgage (arm) affects your specific loan scenario. Get it in writing on your Loan Estimate form, and compare how different lenders handle adjustable-rate mortgage (arm) — the differences can save or cost you thousands over the life of your mortgage.

Real-World Example

For a typical $300,000, 30-year mortgage at 6.5%, understanding adjustable-rate mortgage (arm) can help you evaluate whether you're getting the best possible terms. Even small variations in loan terms translate to significant dollar amounts over 360 monthly payments.
Pro Tip
Before your loan closes, make sure you fully understand how adjustable-rate mortgage (arm) works in your specific mortgage. Ask your loan officer to walk through it — they're required to explain every term on your Closing Disclosure.

Related Terms

Fixed-Rate MortgageCap (ARM)Interest RateMortgage Rate

Tools That Use This Concept

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