It's working right for me on Windows Home & Business. What's on the next screen "Let's find your biggest deduction"? Is the Sales tax deduction box checked? I entered $3,200 sales tax on a car and it said my Sales tax deduction is 4,400. When I delete the car I get 1,200 for the IRS table. You might need to keep going though all the screens to the end of the section.
