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@RJK0308 wrote:

 

In 2016, their old tax preparer gave the return to someone else in their office and the new preparer stopped depreciating the property. The property hasn't been depreciated since then on the Schedule E. 

 receive the missed savings?  

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The old office should amend 2020, 2021 and 2022 for free.  And the old tax office should pay the client for the missed tax savings from 2016-2019.

Unfortunately, Form 3115 does not apply because this was just a "mathematical or posting error".