Hi @delan
As you’re a sole trader, the tax isn’t actually an allowable expense. You should tag the transactions as a transfer to the drawings account, as if you’re personally taking money out of the business.
Hope that helps!
[Edit]
One of my previous posts goes into this in a bit more detail, if you’re interested:
http://community.quickfile.co.uk/t/recording-tax-payment-to-hmrc-in-accounts/11193/2?u=qfsupport