Of course tax income is tied to GDP. GDP is a measure of the economy, and the better the economy, the more taxes will be collected as a percentage of it. That is why US tax rates tend to remain so stable over a term of presidency.
Spending does tend to climb more than GDP climbs.
Plan for eliminating the national debt in 10-20 years:
Specific cuts; defense spending: http://rolexian.wordpress.com/2011/01/03/more-detailed-look-a
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