SalesTax Mate is the ultimate Illinois sales tax preparation software. Support for the following Illinois sales tax forms:ST1,ST2,ST4,ST8 or ST14. Support for 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. E-mail or save returns in either Microsoft Word or PDF format. Return history for each company. Client instructions letter. Support for all types of liability period. Unlimited number of clients. All forms generated by our sales tax software are approved by Illinois Department of Revenue.