It can vary in each state but generally all you pay is the state tax rate on your profits. No extra tax for self employment, just income tax. Some states are a flat rate on all the income you get, from your full time job and your gig work and other states have a variable rate - goes up as you make more income. If you live in a variable tax rate state you would add all of your income and see what rate you fall into and use that percentage for your gig profit. And like the federal tax you will want to send that money in every three months. If you search the department of revenue for your particular state you can see what the state tax requirements are. What state are you thinking of?
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