How do I file a subcontractor supplemental worksheet with a CSV file for my business taxes? You can find instructions on how to do this on our website here. April 16, 2019 14:13 Related articles How do I file business tax online? How do I get an automatic F&E extension? Can a nursery operator or sod farm purchase seeds used to grow sod sold by the nursery operator or sod farm exempt from sales tax on an agricultural exemption certificate? How do contractors deduct payments made to subcontractors on their business tax return? What are the franchise and excise tax filing requirements for an entity that has substantial nexus in the state but qualifies for protection under Public Law 86-272?