Growth makes eligibility drift quietly. A variable-hour employee becomes regular, a leave changes scheduled hours, or a seasonal role returns. Payroll, HRIS, and the carrier can each retain a plausible but different status. When someone needs care or an invoice arrives, the team is reconstructing a decision that should have been visible months earlier.
An hours-and-status audit does not create a universal eligibility rule. Governing plan documents, collectively bargained terms where applicable, carrier/TPA procedures, and law use different definitions and measurement methods. The audit compares the employer’s adopted rule with system data, creates an exception queue, and routes decisions to the right owner. Sources were checked September 16, 2026.
Do not use one headcount for every question
“We have fewer than 50 employees” is not an eligibility control. For ACA applicable large employer (ALE) status, the IRS generally looks to whether an employer had at least 50 full-time employees, including full-time equivalent employees, on average in the preceding calendar year. Complete the calculation month by month: count employees averaging at least 30 hours of service a week or 130 hours in that month as full-time; combine all non-full-time employees’ monthly hours of service, cap each person at 120 hours, divide that combined total by 120 to determine that month’s FTEs, then add the FTE result to the month’s full-time count. Add the 12 monthly totals and divide by 12 for the prior-year average; when the result is not a whole number, the IRS examples round that annual average down to the next lowest whole number. Review the seasonal-worker rule and controlled-group facts separately.
That federal calculation does not automatically define plan eligibility or COBRA coverage. DOL’s COBRA guide describes a separate prior-year 20-employee test and fractional treatment of part-time employees. Plan eligibility, ALE status, COBRA applicability, payroll-deduction eligibility, and internal workforce reporting belong in separate columns—not one guessed “benefits eligible” field.
Map the policy to system fields
Start with actual plan eligibility language and approved policy, not an old enrollment file. Translate each condition into a testable field or documented manual review. If a rule cannot be mapped to a field, source document, or owner, it cannot be audited consistently.
| Rule or question | Data to compare | System of record | Exception owner |
|---|---|---|---|
| Plan eligibility class | Job class, entity, location, permitted class indicator, effective date | HRIS and plan document | HR/plan administrator |
| Hours/status condition | Scheduled status, relevant hours-of-service report, status-change date, leave flag | Payroll/timekeeping and HRIS | HR with payroll |
| Enrollment state | Offer, election/waiver, dependent state, coverage effective/termination dates | Carrier/TPA/enrollment platform | Benefits administrator |
| Payroll implementation | Deduction code, employer contribution, first/last deduction date | Payroll | Payroll owner |
| ALE analysis, if relevant | Monthly full-time/FTE inputs, entity question, seasonal-worker review, methodology record | Payroll/HR data | Finance/HR with ACA adviser |
Run the quarterly roster comparison
Export a roster using a fixed “as of” date. Include employee ID, employing entity, location, job class, hire/rehire dates, current status and status-change date, applicable hours field, leave/termination flag, offer/election state, coverage effective date, and payroll deduction state. Keep it to administrative facts. Supervisors should not add diagnoses, treatment reasons, or claims details; they do not establish eligibility and may belong to a separate protected process.
Compare the roster with plan eligibility classes and the carrier/TPA enrollment file. Do not silently overwrite a conflict. Use an exception queue with a source document, decision owner, due date, and final action. Useful labels: “newly meets stated class,” “hours/status changed—review required,” “enrolled but no current deduction,” “deduction but no enrollment,” “termination/leave handoff,” and “HRIS/carrier conflict.”
Handle status changes with a decision record
A scheduled-hours change is not necessarily a benefits-eligibility change. Before telling an employee coverage will start or end, locate the plan provision, applicable measurement or stability method, employment-status effective date, and carrier/TPA instruction. Record the decision, source, effective date, employee notice, carrier handoff, and payroll action. For a reduction in hours or termination, screen separately for continuation-coverage duties and notices. Church, nonprofit, small-employer, or part-time labels do not decide the issue on their own.
Hypothetical example: A part-time employee moves into a regular full-time role on June 12. HRIS updates the job status while the enrollment platform still shows an earlier waiver. The audit opens an exception. HR identifies the plan rule and measurement method, the administrator confirms the process and date, payroll tests the deduction, and HR sends a factual enrollment notice. The team neither backfills coverage from a title change alone nor denies it because a carrier file is stale.
Keep the annual ALE review separate
Give finance and HR a prior-year ALE data calendar at the start of each year, with the monthly reports already preserved. Retain source data, the full-time/FTE calculation, seasonal-worker analysis, entity/controlled-group questions, and reviewer contact. The IRS says the look-back measurement method identifies full-time employees for employer shared-responsibility purposes; it does not determine whether an employer is an ALE. A quarterly plan-eligibility audit can find an enrollment error, but cannot establish ALE status or replace the required methodology.
Owner checklist and durable closeout
- Scheduled hours are the only input: payroll identifies the hours-of-service report required for the question.
- Carrier data overwrites HRIS: benefits owner investigates and retains the decision record.
- Old plan-year rule: document custodian attaches the current source to the review.
- Leave treated as automatic termination: HR routes the record through plan, leave, continuation-coverage, carrier, and payroll owners.
- Exception closed too early: backup owner verifies system update, employee communication, and payroll effect.
Set a quarterly date and closure standard. At renewal, review repeated exception types: “deduction but no enrollment” may expose a payroll-feed control; repeated status conflicts may expose an HRIS workflow. The output is operating evidence, not a manager scorecard.
For help connecting eligibility rules, enrollment operations, and benefits planning, explore Nexus support for small businesses.
Primary sources and scope
IRS: Determining if an employer is an applicable large employer supports the prior-year average, annual rounding example, and general 50 full-time/FTE threshold. IRS: Employer shared-responsibility Q&A supports the monthly full-time and FTE formula and the limited role of look-back measurement. DOL: Employer’s Guide to Group Health Continuation Coverage Under COBRA supports the separate COBRA test. Checked September 16, 2026. Confirm plan terms, current official guidance, carrier/TPA procedures, and the employer’s facts before acting.