The federal government's largest source of revenue in 2011 was:

Question

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According to the Congressional Budget Office, personal income taxes accounted for 42% of federal revenue in 2011, making it the largest source of revenue. While other sources such as Medicare and Social Security taxes are significant, they do not generate as much revenue as personal income taxes. Corporate income taxes and natural resource extraction royalties also made up a portion of federal revenue, but they were much smaller compared to personal income taxes.

The Federal Government's Largest Source of Revenue in 2011 Was