Millions of Americans face fresh uncertainty over health coverage as enhanced Affordable Care Act premium subsidies move closer to expiration and a federal government shutdown freezes negotiations in Washington. The Kaiser Family Foundation warned that average marketplace premiums could rise sharply for 2027 if the credits lapse.

The enhanced subsidies, first expanded under the American Rescue Plan and extended in 2022, are set to expire on December 31, 2026. Senate Democrats sought to attach an extension to any funding measure before the shutdown began October 1.

Insurers filing 2027 rates warned regulators of double-digit premium increases without the credits. AHIP, the industry's main trade group, said the loss of the subsidies would push coverage out of reach for many self-employed and lower-income enrollees. The Congressional Budget Office has estimated millions could lose coverage if the credits are not renewed.

Open enrollment for 2027 coverage begins November 1, giving lawmakers a narrow window to act. Consumer advocates at Families USA urged Congress to resolve the shutdown and extend the credits before enrollees see final prices. State insurance commissioners in several markets said they were preparing for confusion among consumers.

A Families USA spokesperson said: "Families are going to open their renewal notices and see premiums they cannot afford. Congress created this cliff, and only Congress can prevent it."