State tax filing

For what it's worth...I used the IRS sales tax calculator and it came up with a sales tax deduction of $1038.  If I choose Locality Group 2 (by clicking on the radio button "b" in the scrollable window), TT does come up with the same $1038 value.  So, I'm good.   I still find the "locality group" page in TT to be confusing.  It's almost like it has ignored the fact that I provided the 10.25% Chicago sales tax rate earlier.  Only when I chose Group 2 ("b") does it add the additional 4% local Chicago tax rate (because it knows my ZIP code) to the 6.25% Illinois base sales tax.   This page need a better Help description to explain what it does, and why each Locality Group choice should be made.