TSEM5760 - Trusts for particular purposes: flat management companies - notification from company's tax office
Where you receive a notification from a tax office dealing with the company’s corporation tax, that a flat management company trust has been identified, you should set up a new record, and issue any trust SA returns, which are required.
The company tax office will advise you as to the date from which trust liability first arises, and this can be from any date in the tax year.
If for example the CTSA return covers the accounting period to 31st August 1999, the first period of trust SA liability will be the part year from 1 September 1999 to 5 April 2000.

