"The IRS said that it needs until mid- to late-February to reprogram its processing systems because Congress acted so late this year cleaning up the tax code."

50 million taxpayers must delay filing - IRS

Itemize your tax deductions? Itching for a refund? You're going to have to wait.

The IRS said that it needs until mid- to late-February to reprogram its processing systems because Congress acted so late this year cleaning up the tax code. The bill, which includes deductions for state and local sales taxes, college tuition and teacher expenses, wasn't signed into law until Dec. 17.

The bill ensured that the federal income tax rates would not change, and itemized deductions will continue to be allowed in full for high-income taxpayers.

As a result, the 50 million taxpayers who itemize their deductions will have to hold off for a bit before they file. Of course, not everyone files early: only about 9 million of the 140 million U.S. tax filers filed in January or February of last year.

Link:
http://money.cnn.com/2010/12/31/pf/taxes/irs_filing_delay/index.htm?hpt=T2