I went through all this last year. Only way to enter 9b if taking standard deduction is with downloaded version of TT (not online). You can then enter your 9b. By doing so, however, TT will not let you efile. You must mail in your taxes because they do not support this entry. I have spoken to several people who say it is a legal entry. Guess TT just doesn't want to deal with it.
9b is calculated by (Interest + Ordinary Dividends + Capital Gains) / AGI x State Tax paid in tax year*
This result is limited to $10,000.
You can also use the allocable amount of Foreign Income Taxes IF you did not take a tax credit for them.
*Both tax from your W-2 and Tax paid for last year's taxes less sales & use tax if you have it.
Then next year, you have to do a deduction recovery on 8960, line 7. That's what I am trying to figure out and no one seems to be able to help.
