What is a secondment, and should you take one?
A secondment is a temporary move to a different role, team or organisation, with an agreed return — you remain employed by your original employer throughout, which is the feature that distinguishes it from simply changing jobs.
The forms it takes:
Internal secondment — another team or department within the same organisation.
External secondment — to a different organisation entirely, common between the public sector and industry, between partner organisations, and to charities or professional bodies.
Project secondment — released to work full time on a specific initiative.
Typical duration is three months to two years, and it may be full or part time.
How it usually works contractually. Your substantive post is held open, your contract of employment continues with your original employer, and continuity of service is unaffected. Where the secondment is external, a secondment agreement between the organisations sets out who directs the work, who pays, insurance and confidentiality. The detail matters and is worth reading properly.
The case for taking one:
Low-risk exploration. You can test a different function or sector with a route back — which is precisely what a permanent move does not offer.
Visible new skills and a wider network, frequently more valuable to future applications than another year in the same post.
It is often the fastest route to a promotion you could not evidence readiness for otherwise.
What to check before agreeing:
Is the return genuinely guaranteed, to your own post or merely to "a suitable post"? These are very different.
Who manages you, and who writes your appraisal? Ambiguity here is the most common practical problem.
What happens to pay, pension, and any allowances, particularly if the seconded role is graded differently.
Will anyone maintain your visibility in the home team? "Out of sight" is a real risk, and the people making promotion decisions may be the ones you stop seeing.
Agree a review point rather than assuming the end date is fixed.