If Visa or Mastercard made you guess every month what you owe, instead of using the information at hand to send you a prefilled out statement and letting you make corrections/adjustments if needed, very few would willing use their services. Unfortunately, unlike in other countries, Canadian taxes don't work this way - yet. It is quite likely that the Conservatives, their base, and their lobbiests would make it a partisan issue: https://en.wikipedia.org/wiki/ReadyReturn

On that note:
Fuck Intuit
Fuck H&R Block
Fuck Grover Norquist