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S. 4639

U.S. SenateIn Senate Committee

Summary

S. 4639, the IRS Whistleblower Program Improvement Act, was introduced in the Senate on May 21, 2026 by Sen. Chuck Grassley (R) with 3 co-sponsors. It was referred to Finance, and last saw action on May 21, 2026: Read twice and referred to the Committee on Finance.


Record

Text

S. 4639 has 3 co-sponsors.

sb4639/introduced-in-senate.txt
119 S4639 IS: IRS Whistleblower Program Improvement Act
U.S. Senate
2026-05-21
text/xml
EN
Pursuant to Title 17 Section 105 of the United States Code, this file is not subject to copyright protection and is in the public domain.
II 119th CONGRESS 2d Session S. 4639 IN THE SENATE OF THE UNITED STATES May 21, 2026 Mr. Grassley (for himself and Mr. Wyden ) introduced the following bill; which was read twice and referred to the Committee on Finance A BILL
To provide additional support to whistleblowers who report information about noncompliance with Federal tax laws.
1.
Short title
This Act may be cited as the IRS Whistleblower Program Improvement Act .
2.
Standard and scope of review of whistleblower award determinations
(a)
In general
Paragraph (4) of section 7623(b) of the Internal Revenue Code of 1986 is amended—
(1)
by striking appealed to and inserting reviewed by ; and
(2)
by adding at the end the following: Any review by the Tax Court under the preceding sentence shall be de novo and shall be based on the administrative record established at the time of the original determination and any additional newly discovered or previously unavailable evidence. .
(b)
Conforming amendment
The heading of paragraph (4) of section 7623(b) of the Internal Revenue Code of 1986 is amended by striking
Appeal and inserting
Review .
(c)
Effective date
The amendments made by this section shall apply to petitions under section 7623(b)(4) of the Internal Revenue Code of 1986 which are pending on, or filed on or after, the date of the enactment of this Act.
3.
Exemption from sequestration
(a)
In general
Section 255 of the Balanced Budget and Emergency Deficit Control Act of 1985 ( 2 U.S.C. 905 ) is amended—
(1)
by redesignating subsection (k) as subsection (l); and
(2)
by inserting after subsection (j) the following:
(k)
Awards to whistleblowers
An award authorized under section 7623 of the Internal Revenue Code of 1986 shall be exempt from reduction under any order issued under this part.
.
(b)
Applicability
The amendment made by this section shall apply to any sequestration order issued under the Balanced Budget and Emergency Deficit Control Act of 1985 ( 2 U.S.C. 900 et seq. ) after the date of enactment of this Act.
4.
Whistleblower privacy protections
(a)
In general
Paragraph (6) of section 7623(b) of the Internal Revenue Code of 1986 is amended by adding at the end the following new subparagraph:
(D)
Whistleblower anonymity before the Tax Court
Notwithstanding sections 7458 and 7461, a whistleblower shall proceed anonymously before the Tax Court for all proceedings under this section absent a finding by the Tax Court that a societal interest exists for disclosing the whistleblower’s identity which exceeds the potential harm disclosure could cause to the whistleblower.
.
(b)
Effective date
The amendment made by this section shall apply to petitions filed with the Tax Court which are pending on, or filed on or after, the date of the enactment of this Act.
5.
Modification of IRS whistleblower report
(a)
In general
Section 406(c) of division A of the Tax Relief and Health Care Act of 2006 is amended by striking such use, in paragraph (1) and inserting such use (which shall include a list and descriptions of the top tax avoidance schemes, not to exceed 10, disclosed by whistleblowers during such year), .
(b)
Effective date
The amendments made by this section shall apply to reports for fiscal years ending after the enactment of this Act.
6.
Interest on whistleblower awards
(a)
In general
Section 7623(b) of the Internal Revenue Code of 1986 is amended by adding at the end the following new paragraph:
(7)
Interest
(A)
In general
If the Secretary has not provided notice to an individual described in paragraph (1) of a preliminary award recommendation before the applicable date, the amount of any award under this subsection shall include interest from such date at the overpayment rate under section 6621(a).
(B)
Exception
No interest shall accrue under this paragraph after the date on which the Secretary provides notice to the individual of a preliminary award recommendation.
(C)
Applicable date
For purposes of this paragraph, the applicable date is the date that is 12 months after the first date on which—
(i)
all of the proceeds resulting from actions subject to the award recommendation have been collected, and
(ii)
either—
(I)
the statutory period for filing a claim or suit for refund has expired, or
(II)
the taxpayers subject to the actions and the Secretary have agreed with finality to the tax or other liabilities for the periods at issue, and either the taxpayers have waived the right to file a claim or suit for refund or any claim or suit for refund has been resolved.
.
(b)
Effective date
(1)
In general
The amendments made by this section shall take effect 180 days after the date of the enactment of this Act.
(2)
Special rule
If, as of the date described in paragraph (1)—
(A)
the Secretary has not provided notice to the individual of a preliminary award recommendation as described in paragraph (7)(A) of section 7623(b) of the Internal Revenue Code of 1986, as added by this Act, and
(B)
the applicable date provided in paragraph (7)(C) of such section, as so added, has passed,
the applicable date for purposes of such paragraph (7)(C) is the date that is 12 months after the date described in paragraph (1).
7.
Correction regarding deductions for attorney's fees
(a)
In general
Section 62(a)(21)(A)(i) of the Internal Revenue Code of 1986 is amended by striking 7623(b) and inserting 7623 .
(b)
Effective date
The amendment made by this section shall apply to taxable years ending after the date of the enactment of this Act.

Tracker

The tracker indicates the progress of this legislation as it moves through the legislative process.

  1. Introduced2026-05-21
  2. Passed Senate
  3. Passed House
  4. Conference
  5. To President
  6. Became Law

A bill to provide additional support to whistleblowers who report information about noncompliance with Federal tax laws.

Sponsors

Sen. Chuck Grassley (R) sponsors S. 4639, and 3 members have co-sponsored it, 1 of them from the day it was introduced.

Committees

S. 4639 went before 1 committee: Finance.

Finance
Finance
Referred To · May 21, 2026 · 902 Bills

Actions

S. 4639 has taken 2 actions since May 21, 2026.

ChamberAction
May 21, 2026
Senate
Read twice and referred to the Committee on Finance.Finance Committee
May 21, 2026
Introduced in Senate

Votes

S. 4639 has not gone to a roll call.

2 bills are related to S. 4639.

Titles

S. 4639 goes by 3 titles, 1 of them short titles.

  • IRS Whistleblower Program Improvement Act — Display Title
  • IRS Whistleblower Program Improvement Act — Short Title(s) as Introduced
  • A bill to provide additional support to whistleblowers who report information about noncompliance with Federal tax laws. — Official Title as Introduced

Lobbying

2 clients hired 2 firms and 112 registered lobbyists who named S. 4639 in 8 quarterly filings, 2025 to 2026. Reported under the Lobbying Disclosure Act; a filing’s income covers everything its registrant worked that quarter, so the amounts below are the filings’, not this bill’s.

Filed under Health Issues, Taxation/Internal Revenue Code, Trade (domestic/foreign), Aerospace, Automotive Industry, Aviation/Airlines/Airports, Banking, Budget/Appropriations.

Clients

Who paid to be heard, by how many filings named the bill.

ClientBusinessStateFirmsFilingsReported
CHAMBER OF COMMERCE OF THE U.S.A.District of Columbia17
THE CENTER FOR A FREE ECONOMYPublic policy advocacyVirginia11$100K

Firms

Registrants who filed on the bill, by filings.

RegistrantClientsFilingsReported
CHAMBER OF COMMERCE OF THE U.S.A.17
AKIN GUMP STRAUSS HAUER & FELD11$100K

Lobbyists

Named on the filings that cite the bill. The 20 named most often, of 112.

Filings

The documents themselves, on the Senate’s Lobbying Disclosure site, largest reported first.

ClientRegistrantPeriodReportedDocument
CHAMBER OF COMMERCE OF THE U.S.A.CHAMBER OF COMMERCE OF THE U.S.A.2026 first_quarter$19.8M1st Quarter - Amendme…
CHAMBER OF COMMERCE OF THE U.S.A.CHAMBER OF COMMERCE OF THE U.S.A.2026 first_quarter$19.8M1st Quarter - Report
CHAMBER OF COMMERCE OF THE U.S.A.CHAMBER OF COMMERCE OF THE U.S.A.2025 second_quarter$19.3M2nd Quarter - Report
CHAMBER OF COMMERCE OF THE U.S.A.CHAMBER OF COMMERCE OF THE U.S.A.2025 first_quarter$19.3M1st Quarter - Report
CHAMBER OF COMMERCE OF THE U.S.A.CHAMBER OF COMMERCE OF THE U.S.A.2025 fourth_quarter$18M4th Quarter - Report
CHAMBER OF COMMERCE OF THE U.S.A.CHAMBER OF COMMERCE OF THE U.S.A.2026 second_quarter$17M2nd Quarter - Report
CHAMBER OF COMMERCE OF THE U.S.A.CHAMBER OF COMMERCE OF THE U.S.A.2025 third_quarter$13.7M3rd Quarter - Report
THE CENTER FOR A FREE ECONOMYAKIN GUMP STRAUSS HAUER & FELD2026 second_quarter$100K2nd Quarter - Report

Classification

The Congressional Research Service files S. 4639 under Taxation, one of its 31 policy areas.

CRS Subjects

CRS assigns every bill one policy area from its 31; S. 4639’s is Taxation.

s4639/policy-areas.txt
TaxationAgriculture and FoodAnimalsArmed Forces and National SecurityArts, Culture, ReligionCivil Rights and Liberties, Minority IssuesCommerceCongressCrime and Law EnforcementEconomics and Public FinanceEducationEmergency ManagementEnergyEnvironmental ProtectionFamiliesFinance and Financial SectorForeign Trade and International FinanceGovernment Operations and PoliticsHealthHousing and Community DevelopmentImmigrationInternational AffairsLabor and EmploymentLawNative AmericansPublic Lands and Natural ResourcesScience, Technology, CommunicationsSocial WelfareSports and RecreationTransportation and Public WorksWater Resources Development

Source: congress.gov · legiscan.com