A Variable-Rate Mortgage Disclosure is essential for anyone considering an adjustable-rate mortgage (ARM). It provides transparency into how your loan’s interest rate and payments may fluctuate over the loan’s lifetime.
Under federal law, specifically the Truth in Lending Act (TILA), lenders must provide this disclosure within three business days of your ARM application, along with the Consumer Handbook on Adjustable-Rate Mortgages (CHARM) booklet. This ensures borrowers receive clear, critical information before committing.
Key Components of Your Variable-Rate Mortgage Disclosure:
- Index: The benchmark interest rate your loan’s variable rate is tied to, such as the Secured Overnight Financing Rate (SOFR), which reflects current market interest rates.
- Margin: A fixed percentage added by the lender to the index; it remains constant throughout your loan.
- Interest Rate Caps: Limits on how much your interest rate can increase per adjustment period and over the life of the loan, protecting borrowers from sudden large payment spikes.
- Adjustment Period: How often the rate can change after the initial fixed period ends.
- Initial Interest Rate: Also called the “teaser” rate, which applies during the fixed-rate period.
For example, a 5/1 ARM has a fixed rate for five years, then adjusts annually. Suppose your initial rate is 5%, the index is SOFR at 4% when it adjusts, and your margin is 2.75%. Your new rate would be 6.75% (4% + 2.75%) subject to caps.
Common Mistakes to Avoid:
- Overlooking this document and its detailed terms can leave you unprepared for future payment increases.
- Focusing only on the initial low rate without understanding the maximum possible rate (lifetime cap) can lead to surprises.
- Not asking your lender to explain confusing terms like “fully indexed rate” or “periodic caps;” they are legally obligated to clarify.
This disclosure complements but is distinct from the Loan Estimate, which summarizes loan costs. For deeper understanding of ARMs, see our Adjustable-Rate Mortgage (ARM) article. You can also learn more about related disclosures in our Mortgage Disclosures article.
By carefully reviewing and understanding the Variable-Rate Mortgage Disclosure, you can better prepare for the financial implications of your ARM and manage your mortgage payments confidently.
For official guidance, refer to the Consumer Financial Protection Bureau (CFPB) page on ARMs.

