I and many of my friends worked or work as IT independent contractors. The stupidest among us know we have to pay self-employment social security taxes.
Geithner is recognized as a financial and economic genius. He claimed his earliest jobs were with the Treasury Dept and he knew all about his duties to pay taxes and would never have tried to cheat! Sure!
Linda Chavez, Zoe Baird (there was one other woman) failed to pay their Nanny tax (less in amount and less serious violations). They didn't get a free pass, why should Geithner??? Because of the Obama coattail???
Everytime I write a check to the US Treasury Dept which I do several times a year, I'll remember that the head of that Dept is a tax cheat. He got away with something most of us couldn't get away with.