26 C.F.R. § 41.6696-1
Claims for credit or refund by tax return preparers
(a) In general. For rules for claims for credit or refund by a tax return preparer who prepared a return or claim for refund for excise tax under section 4481, the rules under § 1.6696-1 of this chapter will apply.
(b) Effective/applicability date. This section is applicable to returns and claims for refund filed, and advice provided, after December 31, 2008.