In 2004, taxes on labor were $1.588 trillion, and Corporate taxes were $212 billion. (there was also $25 billion estate taxes which are negligible for the purposes of this post). The total federal revenue was $1.825 trillion.
Also about 200 million in various federal fees, tariffs, estate taxes, and special purpose excise taxes.
Crap! Now I did it. Make that 200 billion.
As Dirksen said "A billion here, a billion there, and pretty soon you're talking real money" ...