You dont pay tax for having crypto in your wallet but exchanges pay do, paying tax is acceptable in fiat as individuals or business owner, this are the registration you undergoes when you wanted your business to get established and registered under government rule, this act of paying tax is what has been in place since ancient days, so paying tax is as simple a the procedures in doing do as long as you're willing and interested in paying, government always had it accounts stipulated for doing so whenever you appear before them for paying.
If for example I had spent £5k on crypto during 2022/2023 and in 2024 I wanted to withdraw £100k profits, what is the tax on that and how do I pay it?
I am new to this so would just like to be prepared for when the time comes and I want to withdraw profits.