(35 ILCS 120/2) (from Ch. 120, par. 441)
    Sec. 2. Tax imposed.
    (a) A tax is imposed upon persons engaged in the business of selling at retail tangible personal property, including computer software, and including photographs, negatives, and positives that are the product of photoprocessing, but not including products of photoprocessing produced for use in motion pictures for public commercial exhibition. Beginning January 1, 2001, prepaid telephone calling arrangements shall be considered tangible personal property subject to the tax imposed under this Act regardless of the form in which those arrangements may be embodied, transmitted, or fixed by any method now known or hereafter developed. Sales of (1) electricity delivered to customers by wire; (2) natural or artificial gas that is delivered to customers through pipes, pipelines, or mains; and (3) water that is delivered to customers through pipes, pipelines, or mains are not subject to tax under this Act. The provisions of this amendatory Act of the 98th General Assembly are declaratory of existing law as to the meaning and scope of this Act.
    (b) Beginning on July 1, 2020, a remote retailer is engaged in the occupation of selling at retail in Illinois for purposes of this Act, if:
        (1) the cumulative gross receipts from sales of
    
tangible personal property to purchasers in Illinois are $100,000 or more; or
        (2) the retailer enters into 200 or more separate
    
transactions for the sale of tangible personal property to purchasers in Illinois.
    Remote retailers that meet or exceed the threshold in either paragraph (1) or (2) above shall be liable for all applicable State and locally imposed retailers' occupation taxes on all retail sales to Illinois purchasers.
    The remote retailer shall determine on a quarterly basis, ending on the last day of March, June, September, and December, whether he or she meets the criteria of either paragraph (1) or (2) of this subsection for the preceding 12-month period. If the retailer meets the criteria of either paragraph (1) or (2) for a 12-month period, he or she is considered a retailer maintaining a place of business in this State and is required to collect and remit the tax imposed under this Act and all retailers' occupation tax imposed by local taxing jurisdictions in Illinois, provided such local taxes are administered by the Department, and to file all applicable returns for one year. At the end of that one-year period, the retailer shall determine whether the retailer met the criteria of either paragraph (1) or (2) for the preceding 12-month period. If the retailer met the criteria in either paragraph (1) or (2) for the preceding 12-month period, he or she is considered a retailer maintaining a place of business in this State and is required to collect and remit all applicable State and local retailers' occupation taxes and file returns for the subsequent year. If, at the end of a one-year period, a retailer that was required to collect and remit the tax imposed under this Act determines that he or she did not meet the criteria in either paragraph (1) or (2) during the preceding 12-month period, then the retailer shall subsequently determine on a quarterly basis, ending on the last day of March, June, September, and December, whether he or she meets the criteria of either paragraph (1) or (2) for the preceding 12-month period.
(Source: P.A. 101-31, eff. 6-28-19.)