Business Tax Classification 4 - for Contractors This video will discuss the unique registration and filing requirements for contractors who fall in business tax classification 4 in Tennessee. Click here to begin watching the video. May 30, 2019 19:55 Related articles What qualifies for industrial machinery exemption? What is a location ID? How do I choose the correct business tax classification for my business? Are property management companies that receive fees for managing residential and non-residential buildings not owned by them exempt from the business tax? What's the local sales tax rate for Oakland, Tennessee?