The Federal Taxpayer Receipt Calculator Has a Problem

From whitehouse.gov:

In his State of the Union Address, President Obama promised that this year, for the first time ever, American taxpayers would be able to go online and see exactly how their federal tax dollars are spent. Just enter a few pieces of information about your taxes, and the taxpayer receipt will give you a breakdown of how your tax dollars are spent on priorities like education, veterans benefits, or health care.

I think this is a great idea, since it will clearly show the priorities of our federal government, so I went to the site and entered my information.  Once I had done that, I entered information for several other common scenarios, and found a problem:

Oops!  Given that over 40% of American households pay negative income tax, it seems unfair that they wouldn’t be able to use this calculator.  Someone should tell the White House about this accessibility error, since I am sure they would like every person in the nation to be able to use this handy tool, and not only those with a positive income tax bill.