How the reduction is delivered: three redesigned silver plans. An insurer offering a silver plan on an Exchange must also submit three variations of it for certification, built to actuarial values of 94, 87 and 73 percent rather than the standard 70. Those correspond to the three eligibility categories at 45 C.F.R. 155.305(g)(2): household income from 100 up to and including 150 percent of the federal poverty level, above 150 up to 200 percent, and above 200 up to 250 percent. The statute sets the same three figures at 42 U.S.C. 18071(c)(2). Each variation also carries a lower ceiling on annual cost sharing than the standard plan, set by HHS each year, and the variations must step down consistently, so no benefit in a higher-value variation may cost more than in a lower one. The enrollee is assigned to the right variation automatically by the insurer on information the Exchange supplies.
Silver only, and this is where the largest amount of money is left on the table. For everyone except American Indian and Alaska Native enrollees, the regulation permits cost-sharing reductions only where the enrollee is in a silver-level plan. Someone eligible at 160 percent of the poverty level who buys a bronze plan for a lower premium gets no reduction at all, and pays the bronze plan's full deductible. The same person in a silver plan gets a plan designed to pay about 87 percent of covered costs, which is better than gold and close to platinum. The premium difference between bronze and silver can easily be smaller than the cost-sharing difference the reduction creates, so "always buy the cheapest plan" is advice that can cost money inside this income band.
The eligibility ceiling is 250 percent, and it is not the subsidy cliff. 45 C.F.R. 155.305(g)(1)(i)(C) requires that the applicant be "expected to have a household income that does not exceed 250 percent of the FPL." The premium tax credit's ceiling is 400 percent. Those are two different thresholds serving two different subsidies, and the temporary rule that removed the credit's ceiling between 2021 and 2025 never touched this one. A reader who has followed the news about the return of the subsidy cliff should not conclude that cost-sharing reductions changed; they did not. The statute frames the reduction in two steps, first reducing the annual limit on cost sharing and then increasing the plan's actuarial value, with ceilings at 18071(c)(1)(B) that coordinate the two, and the plan variations HHS actually requires stop at 250 percent.
Two separate rules for American Indian and Alaska Native enrollees, and most consumer sources omit both. Under 42 U.S.C. 18071(d)(1), an Indian as defined in the Indian Self-Determination and Education Assistance Act whose household income is not more than 300 percent of the poverty line is treated as an eligible insured and the issuer "shall eliminate any cost-sharing under the plan," at any metal level rather than silver only. Under 18071(d)(2), an item or service furnished directly by the Indian Health Service, an Indian tribe, tribal organization or urban Indian organization, or through referral under contract health services, carries no cost sharing at all, with no income test. The regulations implement these as the zero cost sharing and limited cost sharing plan variations.
The federal government stopped paying insurers in 2017, and the discounts continued anyway. HHS states the position plainly in the preamble to its 2027 Notice of Benefit and Payment Parameters: section 1402 "requires issuers to provide cost-sharing reductions ... to increase the actuarial value of coverage for consumers with incomes between 100 and 250 percent of Federal Poverty Level (FPL) who enroll in silver-level QHPs in the individual market, as well as eligible American Indian/Alaska Native consumers who enroll in QHPs at any metal level," and also says that HHS will reimburse issuers "but does not include a valid appropriation to make such payments." Following a 2017 opinion of the Attorney General, "HHS directed CMS to discontinue CSR reimbursements to issuers until Congress provides an appropriation." The obligation on the issuer did not change: 45 C.F.R. 156.410(a) still says a QHP issuer "must ensure that an individual eligible for cost-sharing reductions ... pays only the cost sharing required of an eligible individual." So the discounts still exist and insurers must still give them. What stopped was the government paying insurers back.
What insurers did instead, and why it matters to people who get no subsidy at all. HHS describes the response: state departments of insurance "allowed or instructed issuers to increase (or 'load') premiums either primarily, or only, on silver-level QHPs to offset the issuers' cost of providing CSRs." Loading the cost onto silver premiums inflates the second-lowest-cost silver plan, which is the benchmark the premium tax credit is computed from, so subsidized enrollees saw larger credits and often cheaper bronze and gold plans. Unsubsidized enrollees buying silver saw the increase with nothing to offset it. HHS is now tightening what issuers must document about this practice in their rate filings.
