12 C.F.R. § 101.3 – Procedures.

(a) Notice—(1) Submission. A Federal savings association that had total consolidated assets of $20 billion or less as of December 31, 2017, as reported on the Federal savings association's Consolidated Reports of Condition and Income for December 31, 2017, may make an election to operate as a covered savings association by submitting a notice to the OCC.
(2) Contents. The notice shall:
1. (i) Be signed by a duly authorized officer of the Federal savings association; and
2. (ii) Identify and describe each nonconforming subsidiary, asset, or activity that the Federal savings association operates, holds, or conducts at the time it submits the notice, each of which must be divested, conformed, or discontinued pursuant to § 101.5.
3. (b) Effective date of the election—(1) In general. An election to operate as a covered savings association shall take effect on the date that is 60 days after the date on which the OCC receives the notice submitted under paragraph (a) of this section.
4. (2) Earlier notice. Notwithstanding paragraph (b)(1) of this section, the OCC may notify a Federal savings association in writing prior to the expiration of 60 days that it is eligible to make an election, and the election shall take effect on the date the OCC so notifies the Federal savings association.