Thanks to both for your input. After tracing everything through ( have several 1099s), I did manage to mostly duplicate the calculated Virginia additions (although I don't completely understand the treatment of bond premiums, but those are small amounts.
However, for the subtractions (Sch ADJ line 4), I discovered that my interest on certain state tax exempt federal obligations (2 Federal Home Loan Bank bonds) is not included in the amount shown. This makes sense, since the info is not directly shown on the downloaded 1099 (there is no box for it). The info IS shown in the detail data of the printed 1099 and noted as "not reported to the IRS."
There appears to be no way to manually add to line 4. But according to the state's Form 760 instructions, the amounts should be included here, NOT as "other subtractions" line 6 or "other deductions" line 8. How would you suggest I handle this? I could manually alter the 1099, but I'm concerned that it then won't match the electronic version.
