s2Member Pro has features to handle tax calculations. When you say "bill" do you mean what Americans mean when they use that word? That is, something you get BEFORE a payment is due? Or do you mean a "receipt" which is a record that a payment has been made?
If the latter, that is a feature of both s2Member and s2Member Pro. If you mean an actual bill, that is not something s2Member does but you could use EOT reminder emails to function as a payment reminder.