12 C.F.R. § 226.30

Limitation on rates.

            A creditor shall include in any consumer credit contract secured by a dwelling and subject to the act and this regulation the maximum interest rate that may be imposed during the term of the obligation 
            50

             when:

                50
                 [Reserved]

        (a) In the case of closed-end credit, the annual percentage rate may increase after consummation, or

        (b) In the case of open-end credit, the annual percentage rate may increase during the plan.

[75 FR 7818, Feb. 22, 2010]

Official source