ACA Employer Mandate

The ACA employer mandate — formally the employer shared-responsibility provision — requires an applicable large employer (ALE), generally one with 50 or more full-time-equivalent employees, to offer health coverage to at least 95% of its full-time employees (those working 30+ hours per week) and their dependents. The coverage must meet two tests: it must be affordable (the employee's cost for self-only coverage cannot exceed a set percentage of household income, indexed annually) and it must provide minimum value (paying at least 60% of expected medical costs). Employers with fewer than 50 full-time-equivalents are not subject to the mandate at all.

This matters to a growing small business because crossing the 50-FTE threshold triggers real financial and reporting obligations. If an ALE offers no coverage and at least one full-time employee receives a Marketplace premium subsidy, the IRS can assess the '(a)' penalty on nearly all full-time employees; if it offers coverage that fails the affordability or minimum-value test, it faces the smaller '(b)' penalty for each subsidized employee. ALEs must also file Forms 1094-C and 1095-C each year to document the coverage they offered, and errors or missed filings carry their own penalties. Owners near the threshold should count part-time hours carefully, because part-timers aggregate into full-time-equivalents.

The practical nuance is that the mandate is about offering qualifying coverage, not about how it is funded — an employer can satisfy it through a fully-insured plan, a level-funded plan, or a fully self-funded plan, as long as the coverage meets the standards and qualifies as minimum essential coverage. Because penalties are assessed per employee and can reach thousands of dollars each per year, ALEs should confirm affordability using a permitted safe harbor (such as W-2 wages or the federal poverty line) and keep meticulous offer-of-coverage records to defend against IRS Letter 226-J penalty notices.