Claiming previous year capital losses if not declared in previous return

Hello, Can I use a CGT loss incurred from share trading in 2022-23 if I didn't declare it as Losses Available to be carried forward in a self assessment return for that year? I did not submit a self-assessment for 2022-23 as only losses were made. I have made net capital gains for 2023-24 from share trading and would like to offset the 2022-23 losses against those gains. Can I use the 2022-23 losses even though I did not declare them at the time? Many thanks

Hi Tax_returner502,
You can only set losses against a gain, if you have delcared  the losses, either in your Self Asessment tax return or in writing.
You can amend your 2022 to 2023 tax return online up to 31 January 2025.
After that date, any claim for losses in that tax year, must be declared in writing, along with supporting evidence of the losses.
If the losses are agreed, then can then be set against yoru gain in 2023 to 2024.
Thank you.