Self employed

If you are an independent contractor--no matter what kind of work you are doing -- you will pay self-employment tax and prepare a Schedule C.  Since there is not an employer who is withholding tax or Social Security and Medicare, you pay SE for Social Security and Medicare yourself, as well as ordinary income tax.

https://ttlc.intuit.com/community/self-employed/help/what-is-the-self-employment-tax/00/25922

https://ttlc.intuit.com/questions/2902389-why-am-i-paying-self-employment-tax

https://ttlc.intuit.com/questions/2903027-how-do-i-report-income-from-self-employment

https://ttlc.intuit.com/questions/1901205-where-do-i-find-schedule-se

https://ttlc.intuit.com/questions/1901340-where-do-i-enter-schedule-c

https://ttlc.intuit.com/questions/3398950-what-self-employed-expenses-can-i-deduct

https://ttlc.intuit.com/questions/1901110-do-i-need-to-make-estimated-tax-payments-to-the-irs