26 CFR § 56.6694-3 - Penalty for understatement due to willful, reckless, or intentional conduct.
(a) In general. A person who is a tax return preparer of any return or claim for refund of tax under chapter 41 of subtitle D of the Internal Revenue Code (Code) shall be subject to penalties under section 6694(b) of the Code in the manner stated in § 1.6694–3 of this chapter.
(b) Effective/applicability date. This section is applicable to returns and claims for refund filed, and advice provided, after December 31, 2008.