eCFR editorial change effective 2016-12-30 · current text · last amended by T.D. 9668, 79 FR 33693, June 12, 2014
(a) In general. A practitioner must exercise due diligence—
(1) In preparing or assisting in the preparation of, approving, and filing tax returns, documents, affidavits, and other papers relating to Internal Revenue Service matters;
(2) In determining the correctness of oral or written representations made by the practitioner to the Department of the Treasury; and
(3) In determining the correctness of oral or written representations made by the practitioner to clients with reference to any matter administered by the Internal Revenue Service.
(c) Effective/applicability date. Paragraph (a) of this section is applicable on September 26, 2007. Paragraph (b) of this section is applicable beginning June 12, 2014.