Retain the relevant official terms, communications and payment records, with a clear connection to the sponsored employee and any later action.
Make the record usable when staff change
Identify an appropriate internal contact and preserve access under the company’s real arrangements. This does not invent a mandatory department or universal retention period; it prevents the actual sponsorship history from being lost with one person’s inbox.
Include the part identifying the case and the requested action.
If a payment has already been made, this material is what a bank or an authority will ask for. Keep a dated copy of each version of the instructions and requirements received over the life of a sponsorship, not only the most recent one, because a program can update its process while a case is still open and an employer may need to show what was required at the time an earlier step was completed. Label each version by the date it was received and note which step it governed, so a later reviewer can see that compliance matched the instructions in force at that time rather than a version issued afterward. Store superseded versions alongside the current one instead of discarding them, since a question about an earlier stage is answered with the record that existed then. A version received only by phone or informal message should still be summarized in writing and dated before it is treated as part of the file. Treat the retained file as a timeline, not a single snapshot.