You (or the purchaser or transferee) must complete Form CBS-1, Notice of Sale, Purchase, or Transfer of Business Assets. You must use only the domestic factor information regarding sales information in the "everywhere" denominator when apportioning business income to Illinois.This comprehensive guide explores the complexities of Illinois small business tax. The interest transferred is an interest in a domestic corporation (e.g. Foreign-Owned U.S. Corporation or a Foreign. Corporation Engaged in a U.S. Trade or Business complete lines 1–18 (as applicable).