Do I open the 2017 Turbo Tax software to file an amended return for 2015 because once I file it, it will change my Carryover of Unallowed Expenses for 2016 and 2017?

[tbc777]

"I filed my 2017 taxes this week, so I have not received my refund yet. I have used TurboTax for the past 18 years and file electronically. I need to file an amended return for tax year 2015. Do I open the 2017 TurboTax software and use the 1040X from that software, or do I open the 2015 TurboTax software and use the 1040X from that software? The reason I ask is because once I file the amended return for 2015, it will change my CARRYOVER OF UNALLOWED EXPENSES for 2016 and 2017. Will I also need to file amended returns for tax years 2016 and 2017, or will the 2017 TurboTax software make the adjustments automatically?"

[fanfare]

Carryovers can only be imported when you start the 2017 tax return. after that, any changes, you would have to enter manually.
Always make a paper copy of your originally filed return(s) before starting anything having to do with amendments.

[ee-ea]

Use 2015 software to amend a 2015 return.