I had the similar issue that I have huge Foreign Earned Tax Credit, but can't seem to get rid of $10 NIIT tax, due to my Qualified Dividend income. I tired add portion of dividends to form 4952 , but it did not remove NIIT tax. So I reduce 1099-DIV by $400, and made the adjustment for $400, then add the $400 to Interest on 1099-DIV (same as bank interests), Bingo, $10 NIIT Tax is gone! I agree, TurboTax is only look at to Maximize tax, but not smart enough to handle my situation (with huge Tax credit).
Thanks for your original post that led to solution to solve my problem.
