An estimated 725,000 people who bought Affordable Care Act marketplace coverage in 2025 earned just enough to sit between 400% and 500% of the federal poverty level, a narrow income band that lost its entire premium tax credit when the enhanced subsidy expired at the end of that year, according to an issue brief from the Bipartisan Policy Center. That group made up only about 3% of 2025 marketplace enrollees, but it accounts for a disproportionate share of the coverage losses now showing up in 2026 enrollment figures. For a household in that income range, the change is not a smaller subsidy; it is the complete loss of one.
Who falls into the 400% to 500% band, and why it matters
The 400% federal poverty level threshold works out to roughly $63,000 in annual income for a single person and about $129,000 for a family of four under 2025 poverty guidelines. Below that line, a household still qualifies for some premium tax credit under the ACA’s original, pre-2021 formula. One dollar above it, under the reinstated rules, a household qualifies for nothing at all, regardless of how modestly its income exceeds the threshold.
That all-or-nothing structure is what makes the 400%-to-500% band unusual. A household earning 395% of poverty and one earning 405% can have nearly identical incomes but face dramatically different bills, because the second household crossed a line that mattered enormously before 2021, stopped mattering while the enhanced credit was in effect, and now matters again. The Bipartisan Policy Center’s estimate of almost 725,000 individuals and families describes exactly the group sitting on the wrong side of that line for 2026.
The band drew more sign-ups than before once the enhanced credit was active, because removing the cliff meant a household earning well above 400% of poverty had a financial reason to enroll that it lacked under the original ACA formula. That is part of why the cliff’s return now touches a measurable population instead of a mostly theoretical one: people who enrolled specifically because the barrier was gone are the same people now facing its full return.
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The subsidy cliff the enhanced credit had erased
Before 2021, the ACA’s original design cut off premium tax credits entirely at 400% of poverty, a limit widely known as the subsidy cliff. The enhanced credit adopted in 2021 removed that cliff altogether, capping what any household paid toward a benchmark plan at 8.5% of income no matter how far above 400% its earnings ran, which meant a family earning 450% or even 600% of poverty could still receive meaningful help. That cap, and the elimination of the cliff itself, expired along with the rest of the enhanced credit on December 31, 2025.
An analysis from Thomson Reuters’ tax and accounting group illustrates the size of the jump with a specific example: a family of four earning about $130,000, or roughly 404% of the federal poverty level, saw its monthly marketplace premium rise from about $921 to about $1,998, an increase of nearly $12,900 over a full year, once the cliff returned and the household’s subsidy disappeared entirely.
The other edge of the band, around 500% of poverty, matters too. Households earning meaningfully more than that were often already paying close to full price for marketplace coverage even with the enhanced credit in place, because the 8.5%-of-income cap on premium payments still scaled up with income. The 400%-to-500% range is where the credit’s removal produces the starkest before-and-after difference: a household that paid a capped, modest share of income in 2025 and pays the unsubsidized sticker price in 2026.
Why this group, and not others, absorbed the sharpest cut
KFF’s review of the credit’s expiration found that people in the 400%-to-500% band absorb a disproportionate share of the marketplace’s overall enrollment decline, even though they represent a small slice of the marketplace to begin with. Enrollees below that income range generally retain at least a reduced subsidy under the reinstated formula, giving them some financial reason to keep coverage; enrollees just above 400% lost that reason entirely, and many are dropping marketplace coverage rather than paying the full premium.
Not every household in the affected band drops coverage outright. Some absorb the increase because they need continuous coverage for an ongoing medical condition, or because no other option, such as employer insurance or Medicaid, is available to them. For those households, the loss shows up as a straightforward increase in monthly spending rather than a coverage gap, but the dollar impact in the Thomson Reuters example — thousands of additional dollars a year — is representative of what staying insured in this income band now costs.
The Bipartisan Policy Center’s 725,000 figure and KFF’s enrollment findings describe the same population from different angles: a group that briefly had full marketplace subsidies regardless of how far above 400% of poverty its income ran, and that lost all of it the moment the enhanced credit expired. Unless Congress restores some version of the enhanced credit, that income band remains the one where marketplace coverage is most likely to go from subsidized to full price in a single year.
When a subsidy disappears before Medicare eligibility begins
The subsidy cliff described above affects marketplace coverage specifically, but the underlying problem — a benefit that changes abruptly at one income line — carries over into Medicare, where IRMAA surcharges work on a similar income-tier structure once enrollment begins.
The Medicare Cost & Coverage Protection Kit covers 51 state Medicare cost-help packs and the prior-authorization appeal steps, along with the new Part D out-of-pocket cap.
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This article was produced with the assistance of AI and reviewed by The Money Overview editorial team before publication.
