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provisions of this Act to the contrary, servicemen collecting tax on aviation fuel shall file all aviation fuel tax returns and shall make all aviation fuel tax payments by electronic means in the manner and form required by the Department. For purposes of this Section, "aviation fuel" means jet fuel and aviation gasoline. If a taxpayer fails to sign a return within 30 days after the proper notice and demand for signature by the Department, the return shall be considered valid and any amount shown to be due on the return shall be deemed assessed. Notwithstanding any other provision of this Act to the contrary, servicemen subject to tax on cannabis shall file all cannabis tax returns and shall make all cannabis tax payments by electronic means in the manner and form required by the Department. Beginning October 1, 1993, a taxpayer who has an average monthly tax liability of $150,000 or more shall make all payments required by rules of the Department by electronic funds transfer. Beginning October 1, 1994, a taxpayer who has an average monthly tax liability of $100,000 or more shall make all payments required by rules of the Department by electronic funds transfer. Beginning October 1, 1995, a taxpayer who has an average monthly tax liability of $50,000 or more shall make all payments required by rules of the Department by electronic funds transfer. Beginning October 1, 2000, a taxpayer who has an annual tax liability of $200,000 or SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468