<p>Refunds totaling more than $1.1 billion may be waiting for nearly 1.1 million people who did not file a federal income tax return for 2007.  However, to collect the money, a return for 2007 must be filed with the IRS no later than Monday, April 18, 2011.  The IRS estimates that half of these potential 2007 refunds are $640 or more.</p>
