Nearly 143 million individual income tax returns were filed for Tax Year 2010, an increase of 1.7% percent from  140.5 million returns filed for 2009.  The adjusted gross income (AGI) reported on these returns totaled $8.1 trillion, a 6.1 percent increase from the previous year.

Read more at:

http://www.irs.gov/uac/Newsroom/Fall-2012-Statistics-of-Income-Bulletin-Now-Available