Amends the Illinois Gambling Act. Changes the definition of "adjusted gross receipts" to mean the total of all cash and cash equivalents received by a licensee minus the total of: (1) all cash and cash equivalents paid out as winnings to wagerers; (2) the actual costs paid by a licensee for anything of value provided to and redeemed by wagerers; (3) voided or cancelled wagers; and (4) the costs of free play or promotional credits provided to and redeemed by the applicable licensee's wagerers.