Treasury total (Manditory + Discretionary) expenditure estimates for 2008:
518 Billion (17% of the 2.9 Trillion total)
http://www.whitehouse.gov/omb/budget/fy2008/pdf/08msr.pdf (page 34 [PDF 42])
I'm having a hard time finding how much of that is IRS cost, and I have to get to work. 
It's not only the IRS cost, but the costs to the taxpayers trying to comply with Income tax code:
"In 2005 individuals, businesses and non-profits will spend an estimated 6 billion hours complying with the federal income tax code, with an estimated compliance cost of over $265.1 billion. This amounts to imposing a 22-cent tax compliance surcharge for every dollar the income tax system collects. Projections show that by 2015 the compliance cost will grow to $482.7 billion." - www.taxfoundation.org/files/sr138.pdf
As far as the people working in these jobs, it's not like there aren't other ways to make money in the world. I know it's a stearn outlook on their dependency of the system, but you can't expect the taxpayers to continue pouring money into a system that just needs more and more each year in a neverending cycle. A flat percentage would virtually eliminate this spiral or signifigantly cut it down.
It seems the mods need help with this forum. I have zero tolerance for trolling, platform criticism (Rule 4), and poster bad-mouthing (Rule 3.4) and you will be reported.
Review before posting: http://vgchartz.com/forum/rules.php
