CBO: Feds Taxing More, Spending More, Running Bigger Deficit in 2015 Mikael Thalen Posted on April 13, 2015 Posted in Aggregated No Comments Tagged with Economic Crisis Biggest source of additional tax revenue for the federal government was the individual income tax. Share this:Share Share on Facebook (Opens in new window) Facebook Share on Reddit (Opens in new window) Reddit Share on X (Opens in new window) X Share on LinkedIn (Opens in new window) LinkedIn Email a link to a friend (Opens in new window) Email