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@d31 wrote:

 My 2020 return is showing an NOL in the amount of  depreciation that was missed in a 2016 return in the 11th year.

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Are you saying you want to file Form 3115 to 'catch up' on the depreciation?  Was depreciation taken in 2017, 2018 or 2020?

Does the 1040 actually have a NOL, or are you saying it just has a rental loss?