Key legal question
Whether the cantonal court acted arbitrarily in holding the cost advance untimely despite the electronic payment instructions.
Extracted holding
No arbitrariness was shown; the taxpayers failed to prove that the bank debit occurred within the deadline.
Extracted reasoning
The bank confirmation only showed that the payment order was ready for processing on the last day, not that the account had already been debited. The taxpayers also did not prove the value date or provide further evidence.