If you invested using your Coconut account, here's some guidance.
How do I categorise it?
Investments you make in businesses are personal investments, and so they're not treated as a business expense.
You should mark these as "Personal" in your Coconut app.
Is there tax to pay?
You don't pay any tax when you make an investment. You only pay tax if you earn income from an investment (eg dividends) or make a profit on the sale of an investment.
What about EIS?
Certain UK residents may be eligible to claim tax relief on 30% of their investment under the Enterprise Investment Scheme (EIS). Crowdcube's website has some guidance on claiming EIS relief.
If you have questions about EIS or the certificate you receive from Crowdcube, please get in touch with them, which you can do here.