Transitional Duty in Unionized Workplaces: What HR Needs to Know

When a Grievance Follows the Offer

The physician's restriction form comes back clean — ten-pound lifting limit, no repetitive overhead reaching, six weeks. The HR manager drafts a modified-duty offer the same afternoon: inspection station, seated, no lifting beyond five pounds. It's the obvious fit. It's also, as it turns out, bargaining-unit work currently assigned by seniority to three employees with more time in the department than the injured worker — and by Thursday a grievance has been filed, the steward is citing Article 14, and the modified-duty offer that was supposed to close the case is now evidence in a labor dispute instead.

This isn't a failure of medical judgment or workers' comp knowledge. It's a failure to check the collective bargaining agreement before making the offer. In a union workplace, "can this employee physically do the job" is only the first of two questions — the second is "does the CBA allow this employee to be assigned this job, in this way, right now." Skip that second question and even a medically sound, well-documented transitional duty offer can become a grievance, an arbitration case, or both. This article walks through where CBAs most often collide with modified-duty programs, and what to check before the offer letter goes out.

Transitional Duty in a Union Workplace: Why the CBA Comes First

Outside a union environment, a modified-duty offer is primarily a medical-and-operational question: does a role exist within the restrictions, and is it being offered and documented correctly. Add a collective bargaining agreement and a third layer appears — the contract itself can restrict who is eligible to perform which tasks, under what conditions, and for how long, independent of whether the injured worker is medically capable of doing the work.

Most CBAs were not drafted with return-to-work programs in mind; many predate the employer's current RTW process entirely. That means the contract language on light duty, if it exists at all, is often thin, ambiguous, or silent — which is its own risk. Silence doesn't mean "HR has a free hand." It usually means the question hasn't been tested yet, and the first time it gets tested is in a grievance.

Before building or running a transitional duty program in a union workplace, pull the actual CBA — not an HR summary of it, not last year's version — and look specifically for:

• A light-duty or transitional-duty clause, if one exists, and what it requires (notice, union involvement, time limits)
• Seniority language governing job assignment, bidding, and bumping
• A definition of "bargaining unit work" and whether temporary or modified assignments are carved out of it
• Past-practice language or side letters that may have modified the written contract informally
• The grievance procedure's timelines and escalation steps

None of this replaces the medical restriction process — it sits alongside it. The RTW roles and responsibilities a program assigns to HR, the supervisor, and the treating physician still apply; the CBA just adds another party with standing to object, and another procedure that has to run in parallel with the offer-and-acceptance workflow.

Seniority Rules and Light-Duty Assignment: Where the Conflicts Happen

Seniority is the single most common source of friction between transitional duty programs and collective bargaining agreements. Most CBAs tie job assignment, shift selection, and job bidding to seniority — more time in the role or department generally means first right of refusal on preferred work. A modified-duty assignment, by its nature, skips that queue: it goes to the injured worker regardless of where they sit on the seniority list, because the point is accommodating a restriction, not rewarding tenure.

That's exactly the conflict a steward will raise. If a lower-seniority employee is temporarily assigned to a role that more senior employees would otherwise bid for, the union may argue the employer has violated the seniority provisions of the contract — even though the assignment is temporary, restriction-driven, and tied to an active workers' comp claim rather than a permanent reassignment.

Some CBAs address this directly, with explicit light-duty or "modified assignment" clauses that exempt transitional work from standard seniority and bidding rules. Where that language exists, follow it precisely — including any notice-to-the-union requirement before the assignment starts. Where it doesn't exist, the safer path is usually to involve the union steward or labor relations contact before the offer goes out, not after a grievance has already been filed. A short heads-up conversation — "we have a restriction, here's the proposed task, here's the duration" — costs a few minutes and can resolve ninety percent of what a grievance would otherwise take weeks to work through.

Bargaining Unit Work vs. Temporary Transitional Tasks

A second, related conflict shows up around the definition of bargaining unit work itself. Many CBAs specify that certain tasks belong exclusively to the bargaining unit — meaning supervisors, contractors, or employees outside that specific job classification cannot perform them, even temporarily. If the only "light" task available happens to sit inside another classification's exclusive work, assigning it to the injured employee may draw an objection not from seniority but from jurisdiction: "that's not this employee's classification to perform."

This is one of the clearest reasons a light-duty job description needs to be built and vetted in advance, not improvised at the moment a restriction form arrives. A pre-built library of transitional roles — reviewed against both the physical-demand restrictions and the CBA's classification boundaries — avoids the scramble that produces a technically-compliant-but-contractually-risky offer. If no pre-cleared role fits, that's useful information too: it tells HR the organization needs either a new transitional task or a direct conversation with the union about a one-off accommodation, rather than guessing.

A CBA's light-duty clause, where one exists, typically does one of three things: it defines a specific transitional-duty process the employer must follow, it exempts modified assignments from standard seniority and classification rules under stated conditions, or it stays silent — in which case ordinary seniority and bargaining-unit-work provisions apply by default, and any deviation needs union agreement.

The Grievance Process: What Happens When a Modified-Duty Offer Is Contested

When a union grievance does get filed over a modified-duty assignment, it typically follows the same structure as any other grievance under the CBA: an informal discussion, a written grievance at Step 1, escalation through subsequent steps if unresolved, and potentially binding arbitration if the parties can't settle. The specific timelines and steps are set entirely by the contract in force — there's no generic federal timeline to fall back on, which is precisely why the CBA has to be read before the offer is made, not after the grievance lands.

Two things matter most once a grievance is in motion. First, the underlying medical and documentation record needs to be airtight regardless of the labor dispute — the restriction form, the offer letter, the task description, and the response from the employee all need to stand on their own, because an arbitrator reviewing the grievance will often look at whether the employer followed its own documented process consistently, not just whether the contract was technically satisfied. Second, a grievance over the assignment is a separate track from a workers' comp light-duty refusal. If the employee declines the assignment because of the grievance rather than a medical objection, that refusal still needs to be documented accurately — but the reason for the refusal matters, and conflating a contractual objection with a medical one in the file muddies both the labor case and the comp case.

Documenting the Offer When a Union Is Involved

The documentation standard for a transitional duty offer doesn't change because a union is involved — but what gets added to the file does. In a unionized workplace, the offer record should also capture:

• Whether the union or steward was notified in advance, and when
• Any seniority or classification review completed before the offer was finalized
• Reference to the specific CBA clause (if any) relied on to make the assignment
• Any informal resolution reached with the steward before a grievance was filed

This is also where the overlap with the ADA interactive process gets more complicated, not less. A union contract doesn't suspend ADA obligations, and an accommodation request under the ADA doesn't suspend the CBA — both run at the same time, and an employer sometimes has to reconcile a seniority-based bidding system with a request for reasonable accommodation. That reconciliation is fact-specific and belongs with labor counsel, not a general HR policy — but the starting point is the same: know what the contract says, know what the restriction says, and don't let the offer go out until both have been checked.

Building a Transitional Duty Process That Holds Up in Both Audit and Arbitration

A transitional duty program built only around medical restrictions and state wage-reimbursement rules will work fine in a non-union shop. In a union workplace, it needs a second layer: a pre-cleared library of transitional roles checked against classification and seniority language, a defined notice-to-the-union step built into the offer workflow, and a documentation standard that captures the labor-relations side of the decision alongside the medical side. None of that requires treating every modified-duty offer as an adversarial event — most stewards would rather be looped in early than find out about an assignment through a grievance. It does require building the CBA review into the process the same way the physician's restriction form already is, so "did we check the contract" isn't a question anyone has to ask after the fact.

A documented RTW program policy that explicitly addresses union notification, seniority review, and classification boundaries gives HR, the steward, and the treating physician the same starting point — and gives whoever ends up reviewing the file later, whether that's an auditor, an arbitrator, or an EEOC investigator, a clear record of a process that was followed consistently rather than improvised case by case.

Want the next piece on union-workplace RTW mechanics — grievance timelines by jurisdiction, sample CBA light-duty clauses, or how classification disputes get resolved in arbitration — delivered when it's published? Subscribe to the newsletter below to get new compliance guides as they go live.