Capital loss with capital gain

I have a question about capital loss with capital gains Example - high rate taxpayer bought shares for £20k and sold for £10K Would his allowance rise by £10k or would it rise by more due to the amount of tax he would pay on capital gains eg he had a capital gains allowance of £25k as he would pay £10k tax (40% rate) Does that make sense? Thanks

Hi tombfunky,
Based on your example, there is a loss of £10k and if no other gains in the year, this loss would be carried into later years.
The rate of tax due on any gain is dependant on other income received in the tax year.
Capital Gains Tax rates and allowances
Thank you. 

If I only sell one share and get £500 profit , i don’t have any other profit. Do I need to do self assessment report? And I have £3000 dividend income in 23-24 . I don’t have any income income. Do I need to do income report to HMRC?

Hi
If you dispose of share(s) and the total gain arising from the disposal is below £3000, you do not neet to report the disposal or the gain.