Transfer of capital losses between spouses

Is it possible to transfer 50% of a capital loss between spouses in relation to a 50% jointly owned asset, which has been reported solely on one spouse's tax return?

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Hi
No.
You should have only declared your share of any gain/loss on the asset so if you have declared the full amount you need to amend your return and your spouse then needs to tell us about their loss themselves.

Hello Thank you for your reply. Is the best way to let HMRC know about the amendments to be made on both tax returns (for 21/22 tax year) to write in and explain the circumstances (preferred option) or does this need to be done for both spouses via the self assessment portal. If this can be dealt with via a letter, please can you provide the address to use? Many thanks in advance

Hi
If you submitted your 21/22 tax returns online, you can still amend them online, by logging in to your personal tax account.  
You can also send paper amendments and written letters, detailing the box numbers and figures to be amended to HMRC before that date.  
Paper return amendments, written amendments must be in HMRC possession by 31 January 2024.  
Online amendments must be completed by 31 January 2024.  
After this date it will be too late to amend the tax return, so any claims will need to conform to the guidance on overpayment relief claims SACM12150 at :
Overpayment relief: Form of claims