You are probably well aware that cash is 'dying' as customers nowadays prefer to pay for things using plastic cards and other electronic methods. In fact an increasing proportion of the younger generation no longer carries cash but instead pays for everything electronically.
Therefore would it be a sensible idea to charge a tax on electronic transactions as a reliable source of government revenue?
It's notable that there was a time when a cheque payment incurred a 2d (old pence) tax but this was abolished around 1970.