Hi HappyHenry,
If you complete a self assessment tax return or are claiming relief on investments of more than £33333 @ 30% = £10000, you claim EIS relief in the section Ai2 of SA101
https://www.gov.uk/government/publications/self-assessment-additional-information-sa101.
If you made an investment in shares issued during the year for which you have not yet received a form EIS3 or EIS5, you cannot claim relief for that investment.
You must wait until you have received a form.
If you receive the form after you’ve sent your tax return, complete the claim form inside the EIS3 or EIS5 and send it to us at
H.M. Revenue and Customs
Pay As You Earn
BX9 1AS.
Please have a look at HS341 for more information.
HS341 Enterprise Investment Scheme — Income Tax relief (2023) Updated 6 April 2023.
Thank you.