Declaring CGT Losses in Writing

Hi Forum, I have never been registered for self assessment and would like to declare capital gain losses (in writing) for the 21-22 tax year. The losses were made through cryptocurrency trading, with 9 disposals in total. The total proceeds of disposal was over £50k in the tax year, however I did not report them because a tax return wasn't required for any other reason. I have three questions; 1) If I report the losses in writing with accompanying tax report (including list of the 9 disposals), will this be sufficient OR will I be asked to register for self assessment and report them in that way? 2) If I am asked to register to report them, will I be hit with a substantial late fee because the year I am reporting is 21-22? 3) Am I correct in assuming the deadline for reporting these losses in writing March 2026? Thanks in advance 

Name removed admin .

Hi,
As the total disposal was over £50000, you need to report this in a tax return. Yyou may be given a penalty as you do have Self Assessment criteria for the year.
Thank you.

Thanks for the reply. This information is in contradiction to what is stated by HMRC on this thread: https://community.hmrc.gov.uk/customerforums/cgt/0996c23c-e76c-ee11-a81c-0022481b78d4 "The self assessment criteria would be 1, **is a tax return required for any other reason** and 2, is the disposal value over £50000. If yes to both questions, then the gain must be declared in a tax return, regardless of the type of asset disposed of." A tax return was not required for any other reason in my original query, so did not declare anything. Please clarify?

Hi Matt66,
Only if BOTH criteria are met, does the disposal have to be declared on a Self Assessment tax return, regardless of whether there is a gain or not.
If only one or none of the criteria is met, then you do not need to include on Self Assessment tax return.
Thank you.