They have a reason why they didn't strictly impose tax, they want to give penalty since the citizen didn't pay the correct amount or not pay before the due. Even you want to pay tax before the due, their system sucks and they will ask you to comeback/try it again tomorrow.
If have a choice, I won't live in such country, I want to live in a discipline country.
Would you like to wasting your time and effort just because you want to pay tax?