The return of a corporation with respect to income shall be signed by the president, vice-president, treasurer, assistant treasurer, chief accounting officer or any other officer duly authorized so to act. In the case of a return made for a corporation by a fiduciary pursuant to the provisions of section 6012(b)(3), such fiduciary shall sign the return. The fact that an individual’s name is signed on the return shall be prima facie evidence that such individual is authorized to sign the return on behalf of the corporation.

The return of a partnership made under section 6031 shall be signed by any one of the partners. The fact that a partner’s name is signed on the return shall be prima facie evidence that such partner is authorized to sign the return on behalf of the partnership.

The fact that an individual’s name is signed to a return, statement, or other document shall be prima facie evidence for all purposes that the return, statement, or other document was actually signed by him.

Except as otherwise provided by the Secretary, any return, declaration, statement, or other document required to be made under any provision of the internal revenue laws or regulations shall contain or be verified by a written declaration that it is made under the penalties of perjury.