Yeah, at least in the UK you only have to pay tax when you sell it.
This varies by country.
For instance, in the US you are due to pay CGT on a tax-event, which can be selling into fiat, trading into alt-coins or spending.
This is also true in the UK if your original intention was as an investment. It's a new and grey area, but you won't get a free CG ride for long.
OP: You will need to work out each person's coins and the coin's cost basis, and then you can calculate the gains when they are spent or sold. Until then, depending on your country, you don't need to do anything.
