From Real Business Solutions:
SalesTax Mate is an Illinois sales tax preparation software. It support Illinois sales tax forms such as ST-1, ST-2, ST-4, ST-8, ST-14, and multi-location returns. SalesTax Mate takes the complexity out of creating returns for clients with multiple locations operating under the same Illinois Business Tax number. You can E-mail or save returns in either Microsoft Word or PDF format and return history for each company.