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26 CFR §1.6662-1 — -1 Overview of the accuracy-related penalty.

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Section 6662 imposes an accuracy-related penalty on any portion of an underpayment of tax required to be shown on a return that is attributable to one or more of the following:
  1. (a)Negligence or disregard of rules or regulations;
  2. (b)Any substantial understatement of income tax;
  3. (c)Any substantial valuation misstatement under chapter 1;
  4. (d)Any substantial overstatement of pension liabilities; or
  5. (e)Any substantial estate or gift tax valuation understatement.