The cost of purchasing health insurance on Colorado’s individual marketplace is set to double next year in the absence of enhanced federal subsidies, state insurance officials announced Monday.

When the open-enrollment period for Connect for Health Colorado, the state’s individual marketplace under the Affordable Care Act, begins Nov. 1, the average consumer can expect a net premium increase of 101 percent, according to the figures released by the state’s Division of Insurance.

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The vast majority of that “staggering” increase, the division said, is caused by the expiration of the enhanced premium tax credits, which congressional Republicans have declined to extend. The deadlock over whether to extend the subsidies, which help millions of people afford insurance, is the primary cause of the federal government shutdown that entered its 27th day Monday.

“These premium increases are going to create impossible decisions for families across the state,” Colorado Insurance Commissioner Michael Conway said in a statement. “We have sounded the alarm bells at every turn, but Congress’ refusal to act means that Coloradans will be left with unacceptably high health insurance bills during a tightening time in the economy.”

Roughly 225,000 Coloradans purchase their health coverage from one of six insurers that offer plans on the individual marketplace, established under the Affordable Care Act to serve consumers who are self-employed or otherwise don’t receive insurance from their employers. State insurance officials estimate that 75,000 of those enrollees are now set be priced out of coverage and become uninsured as of Jan. 1.

Subsidies for the purchase of marketplace health plans were included in the ACA, but legislation passed under President Joe Biden in 2021 expanded the number of households that were eligible for the subsidies. The enhanced eligibility allowed more than 3.2 million people to enroll in coverage who otherwise would not have, according to estimates from the Congressional Budget Office.

“For months, Democrats have been sounding the alarm about the Republican-forced health care crisis,” U.S. Representative Diana DeGette, a Denver Democrat and the ranking member on the House Health Subcommittee, said in a statement on Monday’s figures. “Costs are already too high under (President) Donald Trump, and many families will now be forced to choose between staying on their health care or buying groceries.”

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In a poll conducted last month, the nonpartisan health organization KFF found that more than 78 percent of people, including 59 percent of Republicans, want lawmakers to keep the enhanced credits.

Consumer advocates have warned for months of large spikes in insurance premiums and other health costs in 2026, because of the combined impact of the tax credit expiration and broader cuts to Medicaid and other health programs included in Republicans’ tax and spending law.

“It’s clear why premiums are skyrocketing and why Coloradans will be shocked when they go shopping for insurance this open enrollment,” said Mannat Singh, executive director of the Colorado Consumer Health Initiative, a nonprofit health advocacy organization. “Trump and Congressional Republicans have gutted healthcare coverage for families and small businesses that need it, so that they can fund tax breaks for the ultra-wealthy and big corporations. This is what they set out to do, and all of Colorado’s GOP congresspeople voted for it.”

Congressional Republicans have said they are willing to negotiate with Democrats about the tax credits, but only after the government reopens.

Colorado lawmakers passed a bill during an August special legislative session that will partially offset the loss of the enhanced tax credits, including $100 million for the state’s health insurance affordability fund. Without that money, ACA marketplace premiums would have nearly tripled in 2026, the DOI estimated.

“I thank the Colorado legislature for what they have done so far to protect their constituents, and I urge Congress to step up and extend the enhanced premium tax credits,” Conway said. “Coloradans shouldn’t have to gamble their health simply because they cannot afford these rate increases caused by the federal government.”