(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;
CFR 31-10.22-2014 history
2014CFR 31-10.22-2014 Money and finance. Part10:Practice before the internal revenue service. Section10.22:Diligence as to accuracy.