This from their website:
In 2002 individuals, businesses and non-profits will spend an estimated 5.8 billion hours complying with the federal income tax code (henceforth called “compliance costs”), with an estimated compliance cost of over $194 billion. This amounts to imposing a 20.4-cent tax compliance surcharge for every dollar the income tax system collects. By 2007, the compliance cost is estimated, conservatively, at $244.3 billion. However, this estimate does not take into account the recently enacted Economic Growth and Tax Reform Reconciliation Act (EGTRRA) of 2001. Taking EGTRRA into account shows that the compliance cost could soar as high as $350.2 billion by 2007.
It costs more than double to comply with the tax code than to liberate Iraq.