The signal

Open enrollment for 2027 coverage on HealthCare.gov began November 1. On October 27, the Centers for Medicare & Medicaid Services published a proposed rule that would change how the premium subsidy reaches people who buy their own health insurance, starting with 2028 coverage. Comments close November 27. On October 15, the IRS published its own proposed rule. It confirms a change that is already law for 2026 coverage: if you received more advance subsidy during the year than you turn out to qualify for, you pay back all of it. Comments close November 30.

The word

"Pre-eligibility verification." It sounds like paperwork you finish early so nothing goes wrong later. In the proposal the paperwork comes first, and the money waits behind it. Starting with 2028 coverage, if the Exchange flags a data matching issue on your citizenship or immigration status, where you live, your income, your family size, or other coverage you could get, the subsidy that lowers your monthly premium would not be paid until that issue is resolved.

What it actually does

Two rules carry out one 2025 law. CMS reads that law to generally bar the subsidy for any month the Exchange has not verified. CMS writes that many agents, brokers, and web-brokers "may be incentivized to enroll consumers with potentially incorrect income amounts that result in maximum APTC amounts," and that under current rules those consumers keep that subsidy for at least 90 days while the mismatch is open, "allowing agents, brokers, and web-brokers to receive commissions for the time that consumers are enrolled." For the renewal requirement, it adds that "Improper payments are a fiscal risk to the Federal Government and undermine public trust in the integrity of the Exchanges," and that more accurate subsidies "would reduce the likelihood of excess APTC and the associated tax liability at reconciliation for consumers." CMS lists less fraud and more accurate subsidies as benefits and does not quantify them.

Here is the mechanism, for plan years beginning on or after January 1, 2028. When the Exchange's records do not match your application, the rule calls it a data matching issue. Today the subsidy is paid on what you attested while the issue is worked out. Under the proposal, the Exchange would "ensure that advance payments of the premium tax credit and cost-sharing reductions" are "not provided on behalf of an applicant, until such information is verified." You could still enroll in a plan at full price, or pick a plan and hold it until you are verified. You would have 90 days to clear the issue, 95 for citizenship or immigration status. If it never clears, the Exchange decides from data sources, as it already does today, and CMS describes that step as "typically resulting in a loss of enrollment in QHP coverage or a loss or decrease in APTC and CSRs." The advance credit for earlier months of the same year could be paid once you are verified, but not for months in a prior year. Someone who enrolls through a special enrollment period after a birth, an adoption, or a marriage would keep the subsidy flowing on their word.

Renewal changes too. CMS writes that "many enrollees may continue to expect that their coverage with financial assistance will continue from year to year with no action required on their part." For 2028 coverage, the proposal ends that: the Exchange could not renew you with a subsidy unless you provide or confirm your income, family size, citizenship or status, other coverage, and place of residence between August 1 and December 31, 2027. Otherwise the rule describes "automatically re-enrolling individuals into a full-price QHP without APTC and CSRs."

Every figure below is the agency's own estimate. On the Federal platform alone, 3,969,403 people who previously did not have to contact the Exchange to renew would now have to. Across all Exchanges, beginning with 2028 coverage, 332,500 people a year would not enroll at all because they could not finish verification, and another 5,097,630 would go without coverage for an average of 1.5 months while they finish it. Those losses, CMS says, fall on "properly enrolled consumers," on top of a baseline that already assumes fewer improper enrollments under the law. CMS then values the interrupted coverage and books the result as a benefit: "an annual gross net benefit of $3.81 billion results from interrupted coverage, equal to one-half of the $7.62 billion in forgone APTC associated with consumers who do not enroll." It calls that a benefit "from a society-wide perspective," counted "to the extent that consumers experience outcomes" tied to whether they are covered, and says the figure depends on "the symmetric-distribution assumption." The real effect, CMS adds, "could be outside of the estimates provided."

The IRS rule carries the other part of the same law. Before 2026, people under 400 percent of the poverty level had a limit on how much of an overpaid advance subsidy they owed back at tax time. The law removed the limit. In the IRS's words: "for taxable years beginning after December 31, 2025, a taxpayer's tax liability for the taxable year of the coverage is increased by the full amount of the excess APTC." The IRS estimates that in 2028 "approximately 3.7 million returns will include a repayment of excess APTC."

Who it hit

People who buy health insurance through a Marketplace and get help paying for it. Treasury and the IRS expect their rule to affect about 15.6 million people enrolled in Exchange coverage, 13.5 million of them potentially eligible for the credit. The income and family-size checks would apply only to people applying for financial assistance, and the rule would generally not reach plans sold outside an Exchange. CMS is "of the view" that the people who drop out are likely to be "younger and healthier" than those who remain. Assuming those who leave cost 80 percent of the average enrollee, it estimates premiums would rise 0.4 percent, starting in 2028. Missouri and Kansas both enroll through HealthCare.gov, according to CMS's 2026 enrollment file, so the HealthCare.gov dates below apply in both states. HHS's Office of the Assistant Secretary for Planning and Evaluation has counted who selects plans on HealthCare.gov. It found that in 2024 "Black consumers represent 16.3 percent of all consumers selecting plans in HealthCare.gov." It set that against a Kaiser Family Foundation figure it cites: "12.3 percent of the non-elderly adult population is Black." Race was missing for more than half of those consumers, and the office estimated it. Those counts show who selects plans on HealthCare.gov. They do not show who would be held up. Neither rule analyzes its effects by race, ethnicity, or income.