No, you can't add the land improvement rental asset to your 2021 income tax return. You'll have to amend your 2020 income tax return since it's part of the rental sale.
Please see How to amend (change or correct) a return you've already and Form 3115 - Application for change in Accounting Method to enter the depreciation not taken.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
