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personal property at retail in this State. This exemption shall continue for each such taxpayer until such time as he may be determined by the Department to be delinquent in the filing of any returns, or is determined by the Department (either through the Department's issuance of a final assessment which has become final under the Act, or by the taxpayer's filing of a return which admits tax that is not paid to be due) to be delinquent or deficient in the paying of any tax 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 registrant under this Act will permit the registrant to engage in business without registering separately under such other law, ordinance or resolution, at which time that taxpayer shall become subject to all the financial responsibility requirements of this Act and, as a condition of being allowed to continue to engage in the business of selling tangible personal property at retail, may be required to post bond or other acceptable security with the Department covering liability which such taxpayer may thereafter incur. Any taxpayer who fails to pay an admitted or established liability under this Act may also be required to post bond or other acceptable security with this Department guaranteeing the payment of such admitted or established liability. No certificate of registration shall be issued to any person who is in default to the State of Illinois for moneys SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468