Nobody plans the return. The absence was managed: sick notes filed, pay adjusted, cover found. The return gets less attention because it looks like the end of the problem. In practice it is the point where the employee is most likely to struggle, and where a few hours of planning make the biggest difference.
Medical advice gets lost between people. The doctor suggests altered hours, HR files the note, and the line manager never sees the advice. Or the opposite happens, and the whole team learns a diagnosis that should have stayed private. Health information is among the most sensitive data you hold. Share what managers need to act on, such as hours, duties and adjustments, and keep the medical detail with HR.
The plan has no end date. A phased return that is never reviewed drifts. The employee is unsure whether they are back, the manager is unsure what to expect, and pay for the hours not worked becomes an argument. Fix the review dates on day one and write down what happens at each.
Different absences need different returns. After an operation or a period of mental ill health, the questions are medical: what the employee can do, for how long, and with what support. After parental leave they are practical: hours, childcare, flexible working and a place to express milk. After a sabbatical or career break they are mostly about catching up. One template handles all three, because the steps that matter most, contact before the return, a first-day meeting and dated reviews, are the same.
The law differs between the UK and the US, mainly in what medical evidence you can ask for and how adjustments are decided. Where a return could lead to a capability process, a dismissal or a dispute about adjustments, take advice from an employment lawyer on the specific case.