The most common trigger is an employee who tells a supervisor that some part of the job has become hard because of a health condition. A warehouse worker who mentions a lifting restriction, an analyst who asks for a quieter desk because of a concentration disorder, a receptionist who needs an adjusted start time for dialysis: none of them has to file anything formal to start the clock. The form exists precisely so the manager who hears that comment has a clean way to route it to HR instead of making an on-the-spot promise or, worse, brushing it off. The duty to engage begins at the request, not at the paperwork.
A second scenario is the leave request that turns into an accommodation question. When an employee asks for time off for a medical condition and the leave cannot be handled under the FMLA, workers' compensation, or your own PTO program, the ADA may require you to treat additional leave as a reasonable accommodation. The form captures that pivot so the file shows you considered it rather than defaulting to a denial. Our state-compliant PTO policy template pairs naturally with this analysis, since the two programs often overlap.
You also need the form during return-to-work and reassignment situations. An employee coming back from surgery with permanent restrictions, or one whose role has changed in a way their condition no longer fits, both fall inside the accommodation framework. One edge case worth flagging: a request can come from a manager's own observation, not just the employee's words, when a known impairment plainly interferes with work, and a savvy employer documents that it offered the process rather than waiting to be asked. Another underappreciated trigger is the recurring informal arrangement, where a supervisor has quietly let someone leave early for months; once that becomes contested, you want a dated record showing the accommodation was evaluated, not improvised.