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, the Internal Revenue Service announced recently. However, to collect the money, a return for 2007 must be filed with the IRS no later than Monday, April 18, 2011. For Ohio, the IRS estimates there are 33,200 unfiled returns with an average refund of $620.