Tax time can bring surprises for some individuals who receive Affordable Care Act (ACA) subsidies, including owing money back for premium subsidies received during the previous year. The subsidies, which cover a percentage of household income towards health insurance premiums, range from nothing for very low-income people to 8.5% at higher income levels. Enrollees must reconcile their subsidies with their actual income at tax time. However, the Trump administration is proposing to lower this threshold to one year. All enrollees who received subsidies for ACA coverage in 2025 need to include a special form, the 8962, with their tax filings. The maximum owed under this sliding scale for people whose income is on the higher end of the range is $1,625 for an individual and $3,250 for a family. There is no repayment cap for people earning more than four times the federal poverty level, so they could owe back all amounts that exceed their eligibility. The biggest financial hit could be those whose income rises during the year to exceed their current level.