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If you are working for DoorDash, Instacart, GrubHub, etc. you are an independent contractor.   You will be paying self-employment tax for Social Security and Medicare as well as ordinary income tax, since none of that is being withheld from your income.    You will also have to prepare a Schedule C to report your business expenses.

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

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

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://www.calcxml.com/calculators/self-employment-tax-calculator     (non-TT site)

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

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