Get your taxes done using TurboTax

Return to the business. Edit. Income Edit. The screen gives options. Select Other Income. Enter description of cash and the amount. Click continue. There is no EIN entry.

The program will be able to calculate the SE tax, if any from there.  Self Employment tax (Scheduled SE) is automatically generated if a person has $400 or more of net profit from self-employment.  You pay 15.3% SE tax on 92.35% of your Net Profit greater than $400.  The 15.3% self employed SE Tax is to pay both the employer part and employee part of Social Security and Medicare.  So you get social security credit for it when you retire.