I should be asking my accountant this, but I don't feel like getting a $50 bill right now!

I have a new person who wants to hire me for design services, and I'll be giving him invoices per project, instead on a bi-weekly basis like I do with the nutty lady, and will not be filling out any 1040 forms (or whatever number forms they make you fill out)

So, when I submit my bill to him, do I include state sales tax? Anyone know?