Adjustable Rate Rider
The rider that modifies a fixed-rate security instrument to document an adjustable-rate (ARM) loan — and a common source of regulatory violations.
An Adjustable Rate Rider (also called an ARM Rider or Adjustable Rate Note Rider) is a document appended (attached) to a fixed-rate Mortgage or Deed of Trust that modifies it for an adjustable-rate mortgage. The rider specifies: the index (e.g., SOFR, CMT, LIBOR legacy), the margin (e.g., 2.25% margin over the index), the initial interest rate, rate adjustment periods (e.g., adjusts annually after the initial fixed period), rate caps (initial adjustment cap, subsequent adjustment cap, lifetime cap — e.g., 2/2/6), the payment adjustment calculation, and (for option ARMs) negative amortization provisions. The rider is a standalone document recorded with the security instrument. ARM riders were a significant source of litigation after the 2008 crisis: undisclosed terms, incorrect index calculations, payment shock after first adjustment, and TILA disclosure violations. Understanding your ARM rider is essential to verifying whether your interest rate and payment have been correctly calculated.
Purpose
- 1Modify a standard fixed-rate security instrument to accommodate an adjustable-rate mortgage
- 2Document the ARM terms: index, margin, caps, adjustment dates, and payment calculation
- 3Comply with TILA and Regulation Z disclosure requirements for ARM loans
Who Prepares It
The lender prepares the Adjustable Rate Rider at loan origination. The borrower signs. Recorded with the Mortgage/Deed of Trust.
When It Is Used
Used for ALL adjustable-rate mortgages (ARMs): 3/1, 5/1, 7/1, or 10/1 ARMs; option ARMs (with negative amortization); and hybrid ARMs. Required to be recorded with the security instrument.
Legal Effect
The rider modifies the security instrument — the ARM terms in the rider control. If the servicer misapplies the adjustment terms (wrong index, wrong margin, missed caps), the payment may be overstated and the default based on incorrect calculations. A forensic audit that finds ARM calculation errors is a powerful defense and may support a RESPA/TILA violation claim.
Common Mistakes
Homeowner Rights
Related Mortgage Documents
Other Loan Origination Documents
Frequently Asked Questions
How do I check if my ARM rate has been correctly calculated?▼
Compare your rate adjustment notice to the ARM rider: What is the index? (Look it up on the adjustment date.) What is the margin? (Add it to the index value.) What is the result? (Apply caps: initial cap, subsequent cap, lifetime cap.) If the resulting rate is different from what the servicer is charging, challenge it. A forensic loan audit can verify every ARM adjustment calculation from origination.
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