Hi,

I made a similar error.  I made an error in depreciation for 2018, 2019, 2020.  Does this mean I can amend those three years?  I heard about form 3115 being needed if a change needs to be made prior to 3 years.  I then hear about the "2 year rule".  I am confused as to when the 3 years back start.  Essentially, I did it incorrectly for 3 years straight and was wondering if I need form 3115 or it is just a simple amendment?

Thank you.