California Tax Fight Grows Over Medi-Cal and Migrant Costs

California is confronting a fresh political and legal fight over how to pay for Medi-Cal as costs continue to climb and federal rules close off one of the state’s longtime financing tools. At the center of the dispute is a redesigned health-plan tax backed by Gov. Gavin Newsom and Democratic lawmakers, who argue the change is needed to preserve billions of dollars in funding for the state’s Medicaid program.

The conflict has created an unusual alliance. The California Medical Association and the California Association of Health Plans, groups that often clash on healthcare policy, are now working together to block the proposal. Their lawsuit does not focus on coverage for immigrants without legal status, but that issue has intensified scrutiny because healthcare for that population was estimated at $12.4 billion in 2025, according to the Associated Press.

The state’s current health-plan tax structure cannot continue after 2026 under tighter federal restrictions. In response, California developed a new proposal with two possible tracks. One would resemble the current system but could conflict with federal law. The other would comply with the One Big Beautiful Bill Act by shifting more of the tax burden onto private health plans beginning in 2027, if federal officials approve it.

Critics say that approach could make insurance more expensive for Californians who do not rely on Medi-Cal. Brian Blase, president of the Paragon Health Institute, said the revised tax reflects California’s unwillingness to confront what he called unsustainable spending. He told Fox News Digital that estimates show the change could raise family insurance costs by about $400 a year, while also arguing that the state expanded Medicaid too broadly, including to all unauthorized immigrants.

Health insurers have made a similar warning, estimating that the revised tax could add roughly $100 per person per year in premiums. For a family of four, that would amount to about $400 annually on top of normal rate increases. Those projections have fueled concern in a state where high living costs have already become a major political and economic pressure point.

Proposition 35 at the center of the lawsuit

The legal challenge turns on Proposition 35, a voter-approved measure that limits how much California can tax commercial health-plan enrollment and restricts how the resulting money may be used. The proposition passed with overwhelming support, and opponents of the new tax argue the state cannot simply work around those limits because federal policy changed.

California Medical Association CEO Dustin Corcoran said voters made Proposition 35 law and that state officials do not have the authority to ignore it because compliance is inconvenient. Newsom’s office rejects that claim. Spokeswoman Tara Gallegos said the administration believes the tax increase is lawful and expects the courts to agree.

H.D. Palmer of the California Department of Finance said the redesign was crafted specifically to address the new federal rules. He also noted that if Washington refuses to approve a version modeled on the existing tax, Proposition 35 could sunset under current law.

Broader pressure on California’s finances

The tax fight is unfolding against a wider debate over California’s affordability and fiscal stability. The state has seen a long-running outflow of residents and businesses, with cost of living frequently cited as a key reason. One analysis found that nearly 10 million people moved from California to other states between 2010 and 2024, while just over 7 million moved into California from elsewhere in the country.

That migration pattern has raised concerns about the state’s long-term revenue base, especially because California depends heavily on income taxes from higher earners. As the Medi-Cal debate intensifies, the revised health-plan tax has become more than a technical funding question. It now stands as a test of whether California can sustain expansive healthcare commitments without adding to the cost burden already facing privately insured residents.