Self-employed individuals, unlike employees, don’t have someone withholding Social Security or Medicare (FICA) taxes along with pre-payments toward their federal (and state, where applicable) income tax from their wages during the year.

They are not being paid a wage; instead, a self-employed individual must keep a set of books showing income and expenses associated with their self-employed business that will allow them to determine their taxable profits (or losses). While an employer and an employee each pay half of the FICA taxes due on an employee’s wages, a self-employed person pays 100% of these taxes, termed the self-employment tax or SE tax for short, on his or her self-employment profit. If the individual has more than one self-employment activity, the net profits and losses from all of the self-employment activities are combined to determine the amount of the SE tax. However, two spouses have self-employment income, the couple cannot combine their SE incomes when figuring their individual SE tax.