If you incur a chargeable gain in a tax year, you must pay preliminary tax (s 952):

(a) in respect of gains made up to 30 November, on or before 15 December in that year, and

(b) in respect of tax on gains made in 31 December, on or before 31 January in the next year.

You must also file a return on or before the “pay and file” date, i.e., 31 October in the tax year following the year in which the gain was made (s 958(2)).