Hi SAS98KGJ Jayawardena,
There are two online capital gains services.
One for UK residential property and land (PPDCGT), which should be reported and the tax paid within 60 days and the other, real time transaction capital gains tax service (RTTCGT), which covers all other types of UK capital gains.
If you do not already have a government gateway user ID and passord, you can do so at HMRC online services: sign in or set up an account
Using the goverment gateway user ID and password, you can create a RTTCGT account at Report and pay your Capital Gains Tax
For gains arising in the tax year 6 April 22 to 5 April 23, you have until 31 December 23 to report the gains using the realtime transaction service.
If you do not do this, then you will be required to register for self assessment at Report and pay your Capital Gains Tax
, to report the gains by 31 January 2024.
The capital gains tax should be paid by 31 January 2024.