@Carl wrote:
Can I file amendments to my returns for 2018, 2019, and 2020 with a correct cost of property instead?
No. What you have is an accounting error, which is something bigger than just a math error. you can not amend returns. You *have* to do the 3115 to correct the accounting error.
I disagree. Using an incorrect Basis is a "mathematical or posting error", NOT an incorrect "method of accounting".
As such, the only option is to amend. Form 3115 does not apply.
