← Back to Bills
S. 4639Senate119th Congress (2025-2027)In Committee

IRS Whistleblower Program Improvement Act

Sponsored by Chuck GrassleySen. Chuck Grassley (R-IA)
Introduced May 21, 2026

AI-Generated Summary

Updated June 9, 2026 at 5:41 AM UTC

The IRS Whistleblower Program Improvement Act strengthens support for individuals who report tax non‑compliance. It changes how award decisions are reviewed, shields whistleblower awards from budget cuts, enhances anonymity in Tax Court, expands the IRS’s public reporting of major tax avoidance schemes, adds interest on delayed awards, and corrects a technical reference for attorney‑fee deductions. The changes affect whistleblowers, the IRS, and the Tax Court.

Key Provisions

  • Changes the review process for whistleblower award determinations: replaces “appealed to” with “reviewed by” and makes Tax Court review de novo using the original record and any new evidence.
  • Exempts whistleblower awards from reduction under any sequestration order.
  • Allows whistleblowers to remain anonymous in Tax Court proceedings unless the court finds a compelling public interest to disclose their identity.
  • Requires the IRS’s annual whistleblower report to include a list and descriptions of up to ten top tax avoidance schemes disclosed by whistleblowers.
  • Adds interest on whistleblower awards if the Secretary does not provide notice of a preliminary award, with interest accruing at the overpayment rate from a specified date and ending when notice is given.
  • Corrects the statutory reference for attorney‑fee deductions from section 7623(b) to section 7623.

Legislative Activity

Stay on top of the latest movement without scrolling through every action

1 earlier action
SenateIntro Referral Latest Action

Read twice and referred to the Committee on Finance.

Finance Committee

May 21, 2026

View full timeline
SenateIntro Referral

Introduced in Senate

May 21, 2026

SenateIntro Referral

Read twice and referred to the Committee on Finance.

Finance Committee

May 21, 2026

Bill Text

Latest available legislative text

Reading Mode
Latest
Raw Text PDF XML
Introduced in SenateIssued May 21, 2026

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.