Earlier this month, President Bush signed a tax rebate package that will see checks going out to most Americans from the IRS later this spring.

The rules are a bit complicated, so if you're not sure how much you will receive, you can use this simple calculator from Kiplinger.com. 

To complete the tool, you will need to know your adjusted gross income for 2007.

In order to receive a check, you will need to send in your 2007 tax return first.  Thus, those who file for an extension will not receive a check as soon as someone who files by April 15.