The ACA's look-back measurement method gives Florida employers a structured way to determine when variable-hour employees qualify as full-time for health insurance offer purposes. The system works in three sequential periods: a measurement period (when hours are tracked), an administrative period (when results are processed), and a stability period (when coverage status is locked). The system applies primarily to Applicable Large Employers (50+ FTE), but smaller employers offering coverage to part-time staff often borrow the framework for clarity.
| Period | Length Range | Purpose |
|---|---|---|
| Measurement period | 3-12 months | Track each variable-hour employee's hours of service |
| Administrative period | Up to 90 days | Calculate averages, communicate with employees, enroll new full-time |
| Stability period | ≥ measurement period AND ≥ 6 months | Lock coverage status — full-time employees keep coverage; non-full-time can be excluded |
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Standard measurement period applies to ongoing employees. The employer picks a 3-12 month window (typically 12 months) ending shortly before the stability period starts. All ongoing employees are measured against this window every year.
Initial measurement period applies to new variable-hour, seasonal, or part-time hires. It begins on the employee's start date (or first of the next month) and runs 3-12 months. The initial measurement period determines whether the new hire is full-time at the end of the measurement.
Florida hospitality business with 75 employees, mix of full-time and variable-hour shift workers:
Variable-hour employees who averaged 30+ hours/week during Nov 2025-Oct 2026 must be offered coverage starting January 1, 2027 and the offer remains valid through December 31, 2027 regardless of subsequent hour fluctuations.
Smaller employers (and any employer who prefers) can use the monthly measurement method instead. Each month's full-time status is determined based on that month's hours. Simpler but less predictable for variable-hour employees who scrub above and below 30 hours week to week.
Even employers below the 50-FTE ALE threshold benefit from the measurement-period framework when:
The stability period must be at least as long as the measurement period AND at least 6 months. A 6-month measurement allows a 6-month stability. A 12-month measurement allows 12-month stability (most common). The stability period locks the employee's status — even if their hours drop below 30/week, they keep coverage through stability.
A licensed Florida broker can advise on measurement and stability period setup for your workforce.
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