26 U.S.C. § 7206: Fraud and false statements

Willfully makes and subscribes any return, statement, or other document, which contains or is verified by a written declaration that it is made under the penalties of perjury, and which he does not believe to be true and correct as to every material matter; or Willfully aids or assists in, or procures, counsels, or advises the preparation or presentation under, or in connection with any matter arising under, the internal revenue laws, of a return, affidavit, claim, or other document, which is fraudulent or is false as to any material matter, whether or not such falsity or fraud is with the knowledge or consent of the person authorized or required to present such return, affidavit, claim, or document; or Simulates or falsely or fraudulently executes or signs any bond, permit, entry, or other document required by the provisions of the internal revenue laws, or by any regulation made in pursuance thereof, or procures the same to be falsely or fraudulently executed, or advises, aids in, or connives at such execution thereof; or Removes, deposits, or conceals, or is concerned in removing, depositing, or concealing, any goods or commodities for or in respect whereof any tax is or shall be imposed, or any property upon which levy is authorized by section 6331, with intent to evade or defeat the assessment or collection of any tax imposed by this title; or Conceals from any officer or employee of the United States any property belonging to the estate of a taxpayer or other person liable in respect of the tax, or Receives, withholds, destroys, mutilates, or falsifies any book, document, or record, or makes any false statement, relating to the estate or financial condition of the taxpayer or other person liable in respect of the tax;