H.R. 4184 (119th)Bill Overview

To amend the Internal Revenue Code of 1986 to exclude from gross income certain compensation to clinical trial participants, and for other purposes.

Taxation|Taxation
Cosponsors
Support
Bipartisan
Introduced
Jun 26, 2025
Discussions
Bill Text
Current stageCommittee

Referred to the House Committee on Ways and Means.

Introduced
Committee
Floor
President
Law
Congressional Activities
01 · The brief
Plain-English summaryWhat this bill actually does

The bill adds a new Internal Revenue Code section (139J) that excludes from gross income amounts paid to individuals (or their dependents) for participating in approved clinical trials, including compensation and reimbursement of reasonable and necessary expenses. It defines “approved clinical trial” by reference to section 2709(d)(1) of the Public Health Service Act and “dependent” by reference to section 152 of the tax code.

Why people may split

Fiscal cost vs. public-health benefit: liberals emphasize access and participation gains; conservatives emphasize new tax expenditure and unknown revenue loss.

Watch point

Relative to its intended legislative type, this bill establishes a clear and narrowly scoped substantive change to the tax code and program-eligibility rules, with adequate statutory placement and basic definitions but limited operational, fiscal, and oversight detail.

The bill adds a new Internal Revenue Code section (139J) that excludes from gross income amounts paid to individuals (or their dependents) for participating in approved clinical trials, including compensation and reimbursement of reasonable and necessary expenses.

It defines “approved clinical trial” by reference to section 2709(d)(1) of the Public Health Service Act and “dependent” by reference to section 152 of the tax code.

The exclusion would apply to amounts paid after December 31, 2025.

Passage50/100

On content alone the bill is plausible: it is targeted, administrable, and addresses a non-controversial goal (encouraging clinical trial participation). Those features increase the chances it could be adopted, especially as part of a broader health or tax bill. However, it creates an uncosted tax expenditure and imposes a federal constraint on program eligibility determinations, which may prompt scrutiny, CBO scoring concerns, and negotiation hurdles that reduce the chance of standalone enactment.

CredibilityPartially aligned

Relative to its intended legislative type, this bill establishes a clear and narrowly scoped substantive change to the tax code and program-eligibility rules, with adequate statutory placement and basic definitions but limited operational, fiscal, and oversight detail.

Contention48/100

Fiscal cost vs. public-health benefit: liberals emphasize access and participation gains; conservatives emphasize new tax expenditure and unknown revenue loss.

02 · What it does

Who stands to gain, and who may push back.

Likely benefits vs burdens50% / 50%
Likely helpedFederal agencies · Local governments

These are examples from the analysis, not a ranked list of the most-affected groups.

Likely helped
  • Potential benefitReduces tax liability for clinical trial participants by excluding compensation and expense reimbursements from gross i…
  • Potential benefitLowers financial barriers to participation for low- and moderate-income individuals (because payments and reimbursement…
  • Potential benefitRemoves a potential disincentive to participate created by tax and benefits interactions, potentially improving diversi…
Likely burdened
  • Federal agenciesReduces federal tax receipts to the extent clinical trial payments would otherwise have been taxable, producing a poten…
  • Local governmentsCreates administrative and implementation burdens for the IRS, federal program administrators, and state/local agencies…
  • Potential burdenMay create opportunities for abuse or misclassification (e.g., disputes over whether a payment qualifies as compensatio…
03 · Why people split

Why the argument around this bill splits.

Fiscal cost vs. public-health benefit: liberals emphasize access and participation gains; conservatives emphasize new tax expenditure and unknown revenue loss.
Progressive85%

A liberal/left-leaning person is likely to view the bill favorably overall because it reduces financial barriers that can keep low-income people from enrolling in clinical trials and it preserves safety-net eligibility by excluding those payments from means-testing.

They will likely appreciate measures that increase access, diversity, and representation in clinical research.

At the same time they may be concerned about potential for exploitation of vulnerable people and will want safeguards to ensure payments are not coercive and that trials meet strong ethical standards.

Leans supportive
Centrist60%

A centrist/moderate is likely to be cautiously supportive, seeing the bill as a targeted, practical change to reduce administrative barriers to clinical trial participation and protect benefits eligibility.

They will want more information about fiscal impacts and administrative feasibility, and may favor technical fixes or reporting requirements to reduce fraud or gaming.

They will weigh public-health benefits against any new tax expenditure.

Split reaction
Conservative40%

A mainstream conservative is likely to be mixed to somewhat opposed.

They may favor reducing taxes and lowering barriers to voluntary clinical research participation, but will be concerned about creating a new tax expenditure, widening exemptions that complicate benefits administration, and potential for fraud or federal overreach.

They will want tighter limits, fiscal offsets, and strong verification to prevent abuse.

Split reaction
04 · Can it pass?

The path through Congress.

Introduced

Reached or meaningfully advanced

Committee

Reached or meaningfully advanced

Floor

Still ahead

President

Still ahead

Law

Still ahead

Passage likelihood50/100

On content alone the bill is plausible: it is targeted, administrable, and addresses a non-controversial goal (encouraging clinical trial participation). Those features increase the chances it could be adopted, especially as part of a broader health or tax bill. However, it creates an uncosted tax expenditure and imposes a federal constraint on program eligibility determinations, which may prompt scrutiny, CBO scoring concerns, and negotiation hurdles that reduce the chance of standalone enactment.

Scope and complexity
24%
Scopenarrow
24%
Complexitylow
Why this could stall
  • No official cost estimate (CBO/score) is included in the bill text; the size of the revenue loss and any effect on benefit program costs is unknown and could materially affect legislative support.
  • How agencies and state program administrators would operationalize the 'shall not be taken into account' rule across many different programs is unspecified and could create administrative complexity or legal questions.
05 · Recent votes

Recent votes on the bill.

No vote history yet

The bill has not accumulated any surfaced votes yet.

06 · Go deeper

Go deeper than the headline read.

Included on this page

Fiscal cost vs. public-health benefit: liberals emphasize access and participation gains; conservatives emphasize new tax expenditure and u…

On content alone the bill is plausible: it is targeted, administrable, and addresses a non-controversial goal (encouraging clinical trial p…

Unlocked analysis

Relative to its intended legislative type, this bill establishes a clear and narrowly scoped substantive change to the tax code and program-eligibility rules, with adequate statutory placement and basic definitions but…

Go beyond the headline summary with full stakeholder mapping, legislative design analysis, passage barriers, and lens-by-lens tradeoff breakdowns.

Perspective breakdownsPassage barriersLegislative design reviewStakeholder impact map
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