If you are not an independent contractor here are some forms you might need to fill out. Especially see the top of form 8919.
IRS 989 Questions on work status
https://www.irs.gov/pub/irs-pdf/n989.
Determination of worker status, SS-8 Instructions
https://www.irs.gov/pub/irs-pdf/iss8.pdf
Form SS-8
https://www.irs.gov/pub/irs-pdf/fss8.pdf
You will need form 8919
https://www.irs.gov/pub/irs-pdf/f8919.pdf
