The tour operators’ margin scheme (TOMS) is a special scheme for businesses that buy in and re-sell travel, accommodation and certain other services as principals or undisclosed agents (ie; that act in their own name). In many cases, it enables VAT to be accounted for on travel supplies without businesses having to register and account for VAT in every country in which the services and goods are enjoyed. It does, however, apply to travel/accommodation services enjoyed within the UK and wholly outside the UK.
Source: marcusward.co