While your variable APR moves automatically when the Fed moves, the Bank Margin—the portion of the interest rate the bank kept for itself—is much more strictly regulated.
Automatic vs. Manual Changes
- Fed/Prime Changes: These happen automatically. The bank does not need to notify you 45 days in advance when your rate changes because the U.S. Prime Rate moved.
- Margin Changes: If the bank decides to increase your underlying margin (e.g., changing your rate from
Prime + 12.00%toPrime + 14.00%), this is a manual change.
Interest Cost Comparison (per $1,000 balance)
| Scenario | Monthly | Annual |
|---|---|---|
| At Previous Rate (7% Prime) | $20.82 | $249.90 |
| At Current Rate (6.75% Prime) | $20.62 | $247.40 |
| Total Change | $-0.21 | $-2.50 |
Your CARD Act Protections
Under the CARD Act of 2009, banks are subject to several rules when they want to change your margin:
- 45-Day Notice: The bank must provide at least 45 days’ advance written notice before a significant change in terms takes effect.
- The “First Year” Rule: Banks generally cannot increase the APR on a new credit card account for the first 12 months, with very few exceptions.
- Opt-Out Rights: In many cases, you have the right to reject the margin increase. If you do, the bank will likely close your account, but you can pay off the existing balance under the old rate.