You can use the NOL carry back by submitting form 1045. You do not also have to complete a form 1040X. File one or the other.
Individuals may use Form 1045 to claim a quick refund resulting from the carryback of an NOL. Form 1045 must be filed on or after the date for filing a tax return for the NOL year (2016). Form 1045 and the instructions can be downloaded from www.irs.gov. See https://www.irs.gov/publications/p536/ar02.html
If you do not file a Form 1045, you will submit a Form 1040X to process the NOL. If you file a 1040X instead of a Form 1045, you still must attach the NOL computations using the Form 1045 computation schedules.
If you choose to file a Form 1040 X, the net operating loss carryback is reported on line 1 and the box for Net Operating Loss Carry Back should be checked.
In Turbo Tax, follow these procedures to amend a 2015 tax return:
• Sign in to the TurboTax account you used to file your 2015 return.
• Once you've signed in, click 2015 in your Tax Timeline.
• In the Tax Timeline, click the Amend (change) 2015 return link.
• The next screen will instruct you to Download your .tax file. Click Download your .tax file and save the file to your desktop or other easy-to-find location.
• Next, click Download TurboTax Desktop. This takes you to a page where you can download the windows software that corresponds to the tax year you need to amend.
• Then install TurboTax Desktop 2015.
Is there more steps to do after installing TurboTax Desktop 2015?
@bcmv What year did you have your NOL? If your NOL was in 2016, you need to amend 2014, not 2015 (unless 2014 uses up all of the NOL, and then you would amend both years).