Effective immediately, when registering a business with the state of Illinois, Form NUC-1 is no longer accepted. Completing Form REG-1 is the initial step in the registration process for most fees and taxes, including sales and use, administered by the Illinois Department of Revenue. The only tax not currently included on Reg-1 is the Motor Fuel Use Tax, which can be applied for using a separate form, Form MFUT-12. New businesses can also register online here. (What’s New with Illinois Business Registration, Informational Bulletin, FY 2004-22, January 2004)