Thanks Melinda for your prompt response. I think that section is working. Been using Turbotax for years, and have checked several older returns. What I see differently is the treasury interest is being added on line 3 as an addition, which then increases my total state baseline. So, when I subtract the treasury tax once, I get back to what my income baseline should be, then I have to subtract it again to get the taxable Virginia income minus the treasury interest. The problem is in the treasury interest in line 3 in "additions" to Federal Gross Income.
