(a) Limitation on increases within first year Except in the case of an increase described in paragraph (1), (2), (3), or (4) of section 1666i–1(b) of this title , no increase in any annual percentage rate, fee, or finance charge on any credit card account under an open end consumer credit plan shall be effective before the end of the 1-year period beginning on the date on which the account is opened. (b) Promotional rate minimum term No increase in any annual percentage rate applicable to a credit card account under an open end consumer credit plan that is a promotional rate (as that term is defined by the Bureau) shall be effective before the end of the 6-month period beginning on the date on which the promotional rate takes effect, subject to such reasonable exceptions as the Bureau may establish, by rule. ( Pub. L. 90–321, title I, § 172 , as added Pub. L. 111–24, title I, § 101(d) , May 22, 2009 , 123 Stat. 1738 ; amended Pub. L. 111–203, title X, § 1100A(2) , July 21, 2010 , 124 Stat. 2107 .) Editorial Notes Amendments 2010—Subsec. (b). Pub. L. 111–203 substituted “Bureau” for “Board” in two places. Statutory Notes and Related Subsidiaries Effective Date of 2010 Amendment Amendment by Pub. L. 111–203 effective on the designated transfer date, see section 1100H of Pub. L. 111–203 , set out as a note under section 552a of Title 5 , Government Organization and Employees. Effective Date Section effective 9 months after May 22, 2009 , except as otherwise specifically provided, see section 3 of Pub. L. 111–24 , set out as an Effective Date of 2009 Amendment note under section 1602 of this title . CFR Title Parts 14 374