Finance Act 2019 repealed TCGA 1992, s. 57A and Sch. 4ZZA (the provisions relating to ATED-related CGT) with effect from 6 April 2019. This is in consequence of the rules that bring all non-UK residents within the scope of either CGT or corporation tax, as appropriate, in respect of all direct or indirect disposals of UK land (see 592-555ff. for commentary). The commentary below relates to disposals prior to 6 April 2019.
The tax charged on any ATED-related gains is capital gains tax. Capital gains tax is a self assessment tax and the normal self assessment rules and deadlines for notifying chargeability and making returns apply.