The Illinois 2017 Class 6B SER (Sales and Use Tax Exemption Replacement) affidavit is a document that is used to replace the exemption certificate for sales and use tax in the state of Illinois. This document is used by businesses to claim that they are exempt from paying sales and use tax on their purchases. There are two types of Illinois 2017 Class 6B SER affidavits: the Manufacturer’s Affidavit and the Reseller’s Affidavit. The Manufacturer’s Affidavit is used by a manufacturer to claim that the items purchased are either for use in the production of tangible personal property, or for the sale or resale of tangible personal property. The Reseller’s Affidavit is used by a reseller to claim that the items purchased are for resale and not for use by the reseller. Both affidavits must be signed by an authorized representative of the business and must provide details of the items and the total amount of the purchase.