I converted my primary residence into a rental property in 2012. I just noticed now that I do not see prior years unallowed passive losses in 2015 (8582 form) to enter in 2016 tax filing because I did not carry over these unallowed passive losses in 2014 and 2015 tax filing. Q: Do I need to amend previous years (2014, 2015) tax filing to determine the total unallowed passive losses or can I add up prior years unallowed loss from 2012 to 2015 and enter it in 2016 tax filing?
You would need to amend all previous years' tax returns. You start with the earliest year so that the unallowed passive losses of each year are carried over to the following year. After amending your 2015 tax return, you can enter the passive loss carry over on your 2016 return.
Please read to this TurboTaxFAQ on how to amend your returns:
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I just noticed now that I do not see prior years unallowed passive losses in 2015 (8582 form) to enter in 2016 tax filing because I did not carry over these unallowed passive losses in 2014
That would be because for whatever reason, you did not selecte the option to indicate you had passive loss carry overs, on your 2015 tax return. You probably haven't made that selection in any year after 2015 too. The selection is in the property profile section.
Take note that you can't use Turbotax 2015 or older to amend your return, as TurboTax only supports their software for the current tax year and three years back. So for TTX 2015 or older i will be impossible to get the *REQUIRED* corrections and updates to the program so that it works correctly. Additionally, support for TTX 2016 will be going away around July 15th of this year.