Thank you for the response. I decided to test how TT calculates county tax using Marion and Brown. Brown has ~0.8% higher income tax than Marion. When I selected Brown as my resident county and Marion as my employment county, the amount of state tax liability went up. When I selected Marion as my resident county and Brown as my employment county, the amount of state tax liability went down.
I have tested several more permutations of resident county and employment county. It appears that only the resident county matters to TT state tax liability calculation.
