I'm using the desktop version of TurboTax Deluxe, married filling jointly. The annualized income for the 2nd annualize period (form 2210 schedule AI line 3b) is over $250,000. The annualized income for the other 3 periods is less than $250,000. Do owe NIIT (Net Investment Income Tax) for this during the 2nd period? TurboTax isn't automatically adding it to the tax due on form 2210 schedule AI line 14b. I can manually enter it on form 2210 schedule AI line 16b, but then TurboTax says there is an error and says "Line 16 should be blank."
Does this mean I don't owe NIIT for the for the 2nd period even though the annualized income exceeded $250,000 for that period? If I do owe NIIT (for just the 2nd period), what is the proper method getting it added when using the annualized method?
