You pay the self-employed tax rate of 15.3% (as of 2022). It's a combination of 12.4% for social security and 2.9% for medicare. If you're employed by someone, usually that amount is split between both parties (the employee and the employer), so you wind up paying 7.65%. This is one of the reasons, we recommend forming an S Corp. An S Corp allows you to assign yourself a reasonable income vs the total net earnings of your business.