CMS subsidy check would cut ACA enrollment by 332,500 a year

Updated Oct 28, 2026, 9:30 PM CT: the rule published Oct 27, and comments close Nov 27.

CMS estimates 332,500 fewer people a year would enroll in Affordable Care Act (ACA) plans, starting with 2028 coverage, under a rule it proposed on Oct 23 that requires eligibility checks before any subsidy is paid.

The rule published in the Federal Register on Oct 27. Comments close Nov 27 under docket CMS-2026-3367 on regulations.gov.

What changes

Today, an Exchange keeps paying advance premium tax credits (APTC) and cost sharing reductions during a check. That happens when it can’t match an application to government data. The enrollee gets a 90 day window to send documents, per the proposed rule.

Under the proposal, the Exchange must verify four things before it pays. They are household income and family size, citizenship or eligible immigration status, other coverage, and where the person lives, per the CMS fact sheet. Once the Exchange verifies them, the credits are paid back to the first month that qualifies.

Returning enrollees face a new yearly step. They must confirm the same four items between Aug 1 and Dec 31 of the year before coverage. Anyone who skips it is automatically re-enrolled without financial help.

The first window opens Aug 1, 2027, for 2028 plans. People who don’t seek financial help are not affected, CMS said in its Oct 23 release.

Where the 332,500 comes from

CMS projects 237,500 fewer enrollees in states that use HealthCare.gov, from 11,840,500 to 11,603,000. It projects 95,000 fewer across the 22 state run Exchanges, from 5,074,500 to 4,979,500. The starting point is the 2028 forecast in the 2027 payment rule, 16,915,000 people.

CMS also expects 5,097,630 people to go an average of 1.5 months without enrolling while they verify.

The money

CMS puts the cut in premium tax credits at $7.6 billion a year from 2028.

Of that, $2.6 billion comes from people who no longer enroll. The other $5 billion comes from 1.5 fewer months of credits for people who verify late. The math uses an average credit of $655 a month.

The rule says premiums would rise 0.4%, or $2.89 a month. CMS assumes the people who leave have claims at 80% of the pool average, so those who stay cost more on average.

Who is behind it

The rule carries out section 71303 of the budget law signed July 4, 2025, which the administration calls the Working Families Tax Cuts. Treasury and the IRS proposed matching premium tax credit rules on Oct 14.

“Federal subsidies should only go to eligible Americans, not to fraudsters gaming the system,” CMS Administrator Dr. Mehmet Oz said in the Oct 23 release. Treasury Secretary Scott Bessent added, “Hardworking American taxpayers should not be forced to subsidize health care for people who are ineligible under federal law.”

The exceptions

Some families keep help during the check. The waiver covers a special enrollment period after a birth, adoption or marriage. It also covers the loss of a dependent through divorce, legal separation or death.

Enrollees could also “pend” a plan choice. The insurer would get the enrollment, and coverage would start, only after the Exchange confirms the person qualifies for help.

CMS asked for comments on how to tighten checks of residency and family size.

What to do now

Nothing changes for 2027 coverage. Open enrollment for 2027 plans starts Nov 1. More than 760,000 people already lost marketplace coverage on Aug. 31 in a separate CMS action, as covered in 760,000 ACA cancellations: senators press 10 insurers. Insurers are losing members too, as covered in Centene lost 2.4 million ACA members in a year.

If you get subsidized ACA coverage, the date to plan for is Aug 1, 2027. Keeping your income, household and address current on your Exchange account is what keeps help flowing in 2028.

Why it matters: The government’s own math says the check removes 332,500 people from coverage a year and cuts $7.6 billion in aid. Comments close Nov 27. That is the one chance to change it before it is final.