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(f) Disclosure to Committees of Congress
(1) Committee on Ways and Means, Committee on Finance, and Joint Committee on Taxation
Upon written request from the chairman of the Committee on Ways and Means of the House of Representatives, the chairman of the Committee on Finance of the Senate, or the chairman of the Joint Committee on Taxation, the Secretary shall furnish such committee with any return or return information specified in such request, except that any return or return information which can be associated with, or otherwise identify, directly or indirectly, a particular taxpayer shall be furnished to such committee only when sitting in closed executive session unless such taxpayer otherwise consents in writing to such disclosure.
(2) Chief of Staff of Joint Committee on Taxation
Upon written request by the Chief of Staff of the Joint Committee on Taxation, the Secretary shall furnish him with any return or return information specified in such request. Such Chief of Staff may submit such return or return information to any committee described in paragraph (1), except that any return or return information which can be associated with, or otherwise identify, directly or indirectly, a particular taxpayer shall be furnished to such committee only when sitting in closed executive session unless such taxpayer otherwise consents in writing to such disclosure.
(3) Other committees
Pursuant to an action by, and upon written request by the chairman of, a committee of the Senate or the House of Representatives (other than a committee specified in paragraph (1)) specially authorized to inspect any return or return information by a resolution of the Senate or the House of Representatives or, in the case of a joint committee (other than the joint committee specified in paragraph (1)) by concurrent resolution, the Secretary shall furnish such committee, or a duly authorized and designated subcommittee thereof, sitting in closed executive session, with any return or return information which such resolution authorizes the committee or subcommittee to inspect. Any resolution described in this paragraph shall specify the purpose for which the return or return information is to be furnished and that such information cannot reasonably be obtained from any other source.
(4) Agents of committees and submission of information to Senate or House of Representatives
(A) Committees described in paragraph (1)
Any committee described in paragraph (1) or the Chief of Staff of the Joint Committee on Taxation shall have the authority, acting directly, or by or through such examiners or agents as the chairman of such committee or such chief of staff may designate or appoint, to inspect returns and return information at such time and in such manner as may be determined by such chairman or chief of staff. Any return or return information obtained by or on behalf of such committee pursuant to the provisions of this subsection may be submitted by the committee to the Senate or the House of Representatives, or to both. The Joint Committee on Taxation may also submit such return or return information to any other committee described in paragraph (1), except that any return or return information which can be associated with, or otherwise identify, directly or indirectly, a particular taxpayer shall be furnished to such committee only when sitting in closed executive session unless such taxpayer otherwise consents in writing to such disclosure.
(B) Other committees
Any committee or subcommittee described in paragraph (3) shall have the right, acting directly, or by or through no more than four examiners or agents, designated or appointed in writing in equal numbers by the chairman and ranking minority member of such committee or subcommittee, to inspect returns and return information at such time and in such manner as may be determined by such chairman and ranking minority member. Any return or return information obtained by or on behalf of such committee or subcommittee pursuant to the provisions of this subsection may be submitted by the committee to the Senate or the House of Representatives, or to both, except that any return or return information which can be associated with, or otherwise identify, directly or indirectly, a particular taxpayer, shall be furnished to the Senate or the House of Representatives only when sitting in closed executive session unless such taxpayer otherwise consents in writing to such disclosure.
(5) Disclosure by whistleblower
Any person who otherwise has or had access to any return or return information under this section may disclose such return or return information to a committee referred to in paragraph (1) or any individual authorized to receive or inspect information under paragraph (4)(A) if such person believes such return or return information may relate to possible misconduct, maladministration, or taxpayer abuse.
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https://www.law.cornell.edu/uscode/text/26/6103
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