OPEN-END ACCOUNT: DISCLOSURE OF CERTAIN RATE VARIATIONS

(a) Except as provided by Subsection (b), a variation in an interest rate on an account resulting from operation of the previously disclosed index, formula, or provision of law is not required to be disclosed under Section 303.101 or 303.103. (b) Except as inconsistent with federal law, the creditor on an open-end account agreement that provides for a variable interest rate according to an index, formula, or provision of law, that is primarily for personal, family, or household use, and that is subject to this chapter shall give to the obligor notice of a change in the rate resulting from operation of the index, formula, or provision of law. The notice must be given: (1) by a document mailed on or before the beginning of the first cycle for which the change becomes effective; or (2) on or with: (A) the billing statement for a billing cycle that precedes the cycle for which the change becomes effective, if the account is covered by Section 303.006(c); or (B) any billing statement, if the account is not covered by Section 303.006(c).