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@EmsBTW2016 wrote:

I have completed two separate 1045s and used tax tables from 2013 and 2015 to calculate the tax difference.

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I realize I have to amend the 2019 1040, mail it in, and also include in 2020 tax return the two 1045s and include all attachments necessary. Am I missing anything else that would be time consuming?

 

Just to be clear, you need to AMEND 2013-2015.  It is too late to use a 1045 to get the refund based on the 2018 NOL.  You need to amend to get it.

The 1045 for 2018 would only be included on the 2020 return to show the calculation of any NOL carryforward.