Hi I recently started working in my spare time for extra income. I have not established a company realIy. For my first job, I wrote articles for a web site. They have asked me to forward an invoice for payment. Since this is my first time getting paid in this situation, I downloaded a template from microsoft to create an invoice. There is an area where I am supposed to add sales tax. Do I need to add sales tax and why ? Also what should I put under company's name ?? Just my name I guess ?? I am in Nebraska and I pay 7% sales tax while shopping/buying groceries etc. .