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What Trump’s 2025 Tax Law Changes About the Affordable Care Act

Trump’s 2025 tax law leaves the ACA in place while changing Marketplace assistance and Medicaid rules. Learn what the law changes and what coverage estimates include.
From TheFinanceBase Team4 min to read
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Trump’s 2025 tax law did not repeal the Affordable Care Act, but it changes access to ACA Marketplace assistance and Medicaid in ways projected to leave millions more people uninsured. The law’s effects are also distinct from the scheduled end of enhanced Marketplace tax credits, which it did not extend.

Did the law repeal or gut the ACA?

No. Public Law 119-21, H.R. 1, signed by President Trump on July 4, 2025, leaves the Affordable Care Act in place but changes some of its coverage rules. Calling that “gutting” the ACA is a political characterization; the more precise description is that the law narrows or adds conditions to certain routes into subsidized Marketplace coverage and Medicaid. KFF’s summary of the enacted law details those provisions.

What changes for ACA Marketplace coverage?

The law changes who can receive Marketplace financial assistance and what enrollees must do to qualify. These provisions do not all begin on the same date: KFF lists effective dates in 2025, 2026, 2027, and 2028, depending on the provision.

  • More checks before subsidies: Before a person receives premium tax credits or cost-sharing reductions, the Marketplace must verify information including income, coverage status, residence, household size, and immigration status. KFF says this effectively ends automatic renewal for subsidy purposes.
  • Some immigrants lose access to assistance: The law limits which lawfully present immigrants can receive subsidized Marketplace coverage.
  • Limits on some special-enrollment plans: The law restricts premium tax credits and cost-sharing reductions for certain special enrollment periods that are not based on a qualifying life event.
  • Full repayment of excess tax credits: Recipients must repay the full amount of any excess premium tax credit, rather than relying on the previous repayment caps.

These are changes to Marketplace eligibility, enrollment, and financial assistance—not a repeal of the ACA Marketplace system.

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How the law changes Medicaid

Medicaid is a separate program from the ACA Marketplace, although the ACA expanded Medicaid eligibility in participating states. The law adds conditions for a specified group enrolled through the ACA expansion category or a waiver: adults ages 19–64 generally must complete at least 80 hours per month of qualifying work or other activity, or attend school at least half-time. The law includes exemptions, including for parents of children age 13 or younger and medically frail people. It also requires more frequent eligibility checks for expansion adults. KFF’s provision-by-provision summary describes the requirements and exemptions.

KFF reports that CBO estimated the work requirement alone would increase the number of uninsured people by 5.3 million in 2034. That is a projection, not a count of people who have already lost coverage. How states administer the rules may make it easier or harder for eligible people to remain enrolled.

How many people could lose coverage?

The estimates depend on what policies are included, the comparison baseline, and the year measured. The law-only estimate is not the same as an estimate that also includes the end of enhanced tax credits, and the estimates below should not be added together.

Scenario Estimated coverage effect What the estimate includes
Law alone 10 million more people uninsured in 2034, relative to CBO’s pre-enactment coverage estimates. KFF attributes 7.5 million to Medicaid changes, 2.1 million to Marketplace changes, and 0.4 million to other provisions and interactions. KFF, updated August 20, 2025. The reconciliation law’s estimated effect; not the separate expiration of enhanced premium tax credits.
Law plus expiration of enhanced tax credits More than 14 million more people uninsured in 2034, in KFF’s combination of CBO estimates. KFF, updated August 20, 2025. The law and expected expiration of enhanced credits; KFF says this estimate excludes the finalized Marketplace Integrity and Affordability rule.
Permanent extension of expanded premium tax credits 3.8 million more people insured in 2035, according to CBO’s 2025 estimate. CBO, September 18, 2025. A separate counterfactual: permanently extending the expanded credits.
Repeal of the law’s ACA Marketplace provisions 2.9 million more people insured in 2035, according to CBO’s 2025 estimate. CBO, September 18, 2025. A counterfactual repeal of the law’s Marketplace provisions, not the whole law.
Nullification of the June 2025 Marketplace final rule 300,000 more people insured in 2035, according to CBO’s 2025 estimate. CBO, September 18, 2025. A separate counterfactual concerning the CMS rule, not a provision of H.R. 1.

These are modeled estimates, not observed enrollment losses. The 2034 uninsured estimates and 2035 counterfactuals use different years and scenarios, so they are not directly interchangeable. KFF’s state-level estimates allocate national projections; they are not forecasts of specific state policy choices, and KFF describes uncertainty in those allocations.

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What happens to the enhanced Marketplace tax credits?

The enhanced premium tax credits were created by the 2021 American Rescue Plan Act and extended through 2025 by the 2022 Inflation Reduction Act. They increased assistance for people already eligible and extended it to some middle-income Marketplace enrollees. H.R. 1 did not extend them; KFF lists January 1, 2026, as their scheduled expiration absent further congressional action. That expiration is a separate policy change from the Marketplace provisions enacted in H.R. 1. KFF’s summary explains the credits and their scheduled end.

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How does the separate CMS Marketplace rule fit in?

The Centers for Medicare & Medicaid Services finalized the 2025 Marketplace Integrity and Affordability rule on June 20, 2025. It is a separate agency action, not part of H.R. 1. CMS said the rule targets improper enrollment and subsidy payments, and projected that it would lower individual-market premiums by about 5% on average and save up to $12 billion in 2026. Those are CMS projections, not measured results. CMS’s announcement gives the agency’s rationale and projections. HHS Secretary Robert F. Kennedy, Jr. said, “We are strengthening health insurance markets for American families and protecting taxpayer dollars from waste, fraud, and abuse.” That statement describes the administration’s rationale; it is not independent evidence of the rule’s effects.

Because coverage estimates depend on whether the law, credit expiration, rule, and interactions are included, a number should always be read alongside its year and scenario. In particular, KFF’s estimate of more than 14 million additional uninsured in 2034 excludes the finalized CMS rule’s effects.

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