Why is it that when I receive a refund on my PA state taxes, if I have also itemized deductions in that same year, I need to report the refund amount listed on the 1099-G on the next year's federal tax form? I don't see the relationship/reason to justify why I need to report that amount. It is money that I overpaid the state with funds that have already been taxed federally. Can anyone clearly explain this to me???