From CNN.com:
Americans may like to talk about taxes  but according to an annual survey by The Tax Institute at H&R Block  (NYSE: HRB), most can't answer even the most basic tax questions correctly.
 
"Given the current economic climate  -- and the need for taxpayers to claim every tax credit and deduction  they're due -- the survey results are alarming," said Amy McAnarney,  executive director of The Tax Institute at H&R Block. "The  bottom line: Americans are failing Taxes 101."
 
The Tax Institute survey assessed the  knowledge and opinions of a nationally representative sample of more  than 1,000 U.S. adults, and found the majority doesn't know a credit  from a deduction and, even more surprising, they aren't completely sure  how much they even pay in taxes.