California just built another affordability squeeze into the health insurance system, and the fight over whether it survives runs straight through Washington.

On July 6, California Assembly Republicans sent a letter to President Trump’s administration challenging the legality of a newly enacted Healthcare Premium Tax pushed by Gavin Newsom and Sacramento Democrats.

Their ask is simple. Deny federal approval, and the tax cannot be collected.

Carl DeMaio, one of the Assembly Republicans behind the effort, announced the letter publicly.

Here is the piece that makes this different from the usual Sacramento tax fight. The new tax has a federal off switch, and Republicans are trying to flip it.

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The New York Post reported that California Republicans are appealing directly to the Trump administration to stop the healthcare tax increase tied to Newsom’s budget and health-tax redesign.

The report frames the consumer hit at roughly $400 a year for a family of four, which turns an obscure state financing maneuver into a kitchen-table premium issue.

It also puts the political fight where it belongs: the state passed the tax structure, but the federal government still has to approve it before Sacramento can collect it.

That means this is no longer just a Sacramento budget fight. It is now a test of whether President Trump’s regulators will let California replace one Medicaid tax scheme with another version that critics say lands on private coverage.

The Assembly Republican release, carried by Lassen News, lays out the mechanics.

Republicans warn the tax on health coverage will drive up premiums for families, workers, and small businesses across California right as household budgets are already stretched.

The release stresses that the tax cannot be collected until the federal government signs off, which makes federal review the entire ballgame before any premium hit can begin.

DeMaio’s argument in the release is that Newsom and Sacramento Democrats overspent, could not balance the budget honestly, and now want working families to swallow another backdoor tax hike to cover it. For a state that already ranks near the top for cost of living, that is a hard sell.

CalMatters reported that legislators approved a redesigned managed care organization tax meant to protect federal Medi-Cal dollars while shifting more of the cost onto privately insured Californians.

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The redesign lowers the tax on Medi-Cal plans and raises it on private plans to the same level, a direct response to new federal rules closing the old uneven-tax structure.

Under the plan, every health plan would pay $8.85 per enrollee per month, and CalMatters reported premiums could climb about 1.5 percent if plans pass the cost through to consumers.

By the plans’ own estimates, that works out to roughly $100 more a year per person, or about $400 more for a family of four. CalMatters also confirmed the revised tax still needs federal approval from the Trump administration before it can take effect.

The affordability warning reaches beyond Republican messaging. A statewide physician group raised the same alarm.

The California Medical Association warned that the state’s 2026-27 budget and health trailer bill carry a $1.5 billion tax increase expected to be passed along through higher health insurance premiums.

CMA put the potential hit at as much as $400 a year for a family of four, landing on the same basic household-cost range now driving the Republican challenge to the tax.

That gives the warning more weight than a partisan press release. Doctors are telling Sacramento the tax makes coverage harder to keep, while Republicans are asking Washington to stop the collection mechanism before it starts.

Newsom’s office is not disputing the price tag. It is trying to hang it on President Trump.

That response gets the sequence backward. The reason California had to redesign the tax at all traces to a specific federal rule.

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The Centers for Medicare & Medicaid Services issued a final rule in January 2026 closing a health-care-related tax loophole.

CMS said the rule prohibits states from taxing Medicaid business at higher rates than non-Medicaid business, and blocks tax designs built to disguise those differences.

The fact sheet says Congress adopted the policy in President Trump’s Working Families Tax Cuts legislation and allowed transition periods for states to come into compliance.

CMS pointed to California specifically as the example, noting a high monthly Medicaid MCO tax stacked against a much lower commercial member-month tax. That is the backdrop for this fight: Washington closed the old financing gimmick, and California answered with a redesign that critics say sends the bill to private premium payers.

So Washington closed the old financing trick. It did not order Sacramento to turn around and load the difference onto private premiums.

That was a choice, and California’s legislature made it.

The leverage now sits with the Trump administration and CMS, because the tax stays parked until federal regulators approve it.

Assembly Republicans want that answer to be no, and they are betting a federal review that already flagged California’s tax games will look hard at the next version.

 

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