I've been self-employed for 30 years. Not working on the clock.
Not entitled to social Security, and that's OK.
The self-employment tax rate is 15.3%. The rate consists of two parts: 12.4% for social security (old-age, survivors, and disability insurance) and 2.9% for Medicare (hospital insurance).
my wife is also self employed - and I do her taxes -so I am very familiar here