Negligible value claim

I hold some SEIS shares, original cost £2,900, now valued at £290. I'm aware that the interpretation of negligible is "next to nothing" but this is still pretty subjective. Could a 10% value be deemed as negligible ?

Hi

Negligible value claims must be submitted in writing or by entering a negligible value on your tax return.  
For tax purposes there is no accepted definition of ‘negligible value’, but generally it applies to assets that have become worth next to nothing while someone has owned them.  
Assets cannot have been of negligible value when you acquired them, they must have become of negligible value while you have owned them.  
If you can give evidence to HMRC that shows that your assets no longer have any value since you acquired them, you may be able to make a negligible value claim.
You can use this to realise a loss to reduce your Capital Gains Tax liability. Please see Negligible value claims and agreements

Thank you

Hi HMRC, Regarding the negligible value claim for stock shares, I would like to know if such claim could be reported in the SA108 supplementary page together with Self Assessment Tax Return, and secondly, if the calculation (computation) working sheet is required to show the acquisitions of these shares and the date of these shares becoming neglibile value for submission. Also, regarding the evidence for the claim, do I need to submit the relevant bank statement showing the stock shares are in "untrade" status (= NO market price) which absolutely implied the value of shares is negligible value that I would like to apply for the captioned claim in my tax return? I am looking forward to receiving your expert advice. Thank you.

Hi KuenHK,
Please refer to guidance at: 
HS286 Negligible value claims and Income Tax losses on disposals of shares you have subscribed for in qualifying trading companies (2024).
Thank you.