Mid-nineties: I don't quite remember the hard numbers, but it was in my second year of owning my own business.
Gross income (1099) was in excess of $90K, a good accountant worked it through so that I paid a total of only $600 (+-) total in State, Federal, and Social Security.
Of course, according to my Social security statements, I only made @ $4000 that year! That could have hurt should I have become disabled and that year counted toward my benefits!