What percentage do I pay as a single woman over 80 for self employment before expenses and deductions?

[Opus 17 · Accepted solution]

Same as everyone else.

Self-Employment income is subject to 15% self-employment tax on your net profit (gross income minus business expenses).  The net income also flows to your form 1040 where it is subject to income tax at 0%, 10%, 12% or higher, depending on the amount of income.  At your age, self-employment income will not reduce the amount of your SS benefit, but it may make part of your SS benefit taxable.  If your taxable income plus half your social security is more than $25,000, then part of your social security will also be taxable.  

You are not exempt from self-employment tax just because you are retired.  However, the amount of SE tax you pay will go toward your credit at the social security administration and may result in increased benefits in the future, depending on your work history and the amount of self-employment income you have.