EIM68220 | Tax treatment of Post Office employees: sub- postmasters: payments on termination of office
From HM Revenue & Customs · Employment Income Manual
Where a sub-postmaster ceases to hold that office, any terminal payments received must be considered under the rules applicable to employees even if the remuneration of the office may, in practice, have been included with trade receipts in accordance with EIM68205.
The main types of terminal payments and their tax treatment are as follows: