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due under this Act or under any other State tax law or municipal or county tax ordinance or resolution under which the certificate of registration that is issued to the applicant under this Act will permit the applicant to engage in business without registering separately under such other law, ordinance or resolution. Any person aggrieved by any decision of the Department under this Section may, within 20 days after notice of such decision, protest and request a hearing, whereupon the Department shall give notice to such person of the time and place fixed for such hearing and shall hold a hearing in conformity with the provisions of this Act and then issue its final administrative decision in the matter to such person. In the absence of such a protest within 20 days, the Department's decision shall become final without any further determination being made or notice given. With respect to security other than bonds (upon which the Department may sue in the event of a forfeiture), if the taxpayer fails to pay, when due, any amount whose payment such security guarantees, the Department shall, after such liability is admitted by the taxpayer or established by the Department through the issuance of a final assessment that has become final under the law, convert the security which that taxpayer has furnished into money for the State, after first giving the taxpayer at least 10 days' written notice, by registered or certified mail, to pay the liability or forfeit SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468