Tax group unveils tax-cut calculator

"You'll be able to compare today's law, with all of the 2001-2003 tax cuts still in place, against two alternatives to see how different taxpayers would make out," the Center states in a release.

The two alternatives show how incomes would be affected if all the George W. Bush-era tax cuts expire on schedule at the end of the year, and if only the top two brackets expire, as proposed by President Obama and Democratic leaders in Congress.