Why Form 1095-C Matters for Staffing Agencies

Any US employer with 50 or more full-time equivalent employees is an Applicable Large Employer (ALE) under the Affordable Care Act, and ALEs must file Form 1095-C for every full-time employee, along with the transmittal Form 1094-C, by the IRS deadline each year. Failure to file, or filing with errors, results in penalties that scale with the number of forms and the length of the delay. As of 2024, penalties run from $60 per form for corrections within 30 days up to $310 per form for willful disregard, with no per-filer cap in cases of intentional non-compliance.

For staffing agencies, the 1095-C obligation is particularly complex because their employee headcount can fluctuate significantly month to month. An agency that crosses the 50 FTE threshold during the year may not realize it has become an ALE until year-end, when the compliance window is already tight. Agencies that employ temporary workers directly also face the question of which workers qualify as full-time (averaging 30 or more hours per week for the applicable measurement period) and must be offered coverage.

How Form 1095-C Works

Form 1095-C is a reporting document, not a tax return. It tells the IRS three things: whether the employer offered minimum essential coverage to the employee, whether that coverage was affordable, and whether the employee enrolled. Employees use the form to document their compliance with any applicable coverage requirements, though the individual mandate penalty was reduced to zero at the federal level from 2019 onward. Several states, including California, Massachusetts, New Jersey, and Rhode Island, have state-level mandates that still require the form for state tax purposes.

The form has three key sections. Lines 14 and 16 in Part II use IRS code series to describe what coverage was offered and the reason for any safe harbor the employer is claiming. Getting these codes wrong is one of the most common 1095-C errors. Line 15 reports the employee's required monthly contribution for the lowest-cost self-only coverage. Employers use this line to document affordability, tested against three safe harbors: W-2 wages, rate of pay, and the federal poverty line.

For a staffing agency with variable-hours temporary workers, the look-back measurement method allows employers to track hours over a standard measurement period (typically 3 to 12 months), determine full-time status, and then apply that status for a defined stability period. A worker who averages 32 hours per week over the 12-month measurement period is a full-time employee for ACA purposes and must be offered coverage for the subsequent stability period, regardless of how many hours they actually work during that period.

A commercial staffing firm with 300 temporary warehouse workers and 40 internal staff becomes an ALE in their third year of growth. At year-end, the HR director works with the payroll provider to run the measurement period analysis, identify which temporary workers qualify as full-time, confirm coverage offers were made and documented, and generate 1095-C forms for all 340 full-time employees. The 1094-C transmittal is filed electronically by the March 31 deadline.

Form 1095-C in Practice

A light industrial staffing agency with 180 internal employees and 220 active temporary workers approaches year-end. The payroll team pulls monthly hour tracking data to identify which temporary workers averaged 30 or more hours during the annual measurement period. Twelve workers qualify as full-time employees under ACA rules. The agency verifies that all 12 were offered minimum essential coverage during the applicable stability period and prepares 1095-C forms with the appropriate series codes. Total forms filed: 192 for internal staff and 12 for qualifying temporaries. Penalties avoided: approximately $62,000 that would have resulted from a full non-filing scenario.