Guidance on using unplanned depreciation, bonus depreciation or any other accelerated methods?

Summary:

We are using Fixed assets in the Cloud.

Where can we find guidance and also examples for using unplanned depreciation, bonus depreciation or any other accelerated Depreciation methods?

Content (required):

Version (include the version you are using, if applicable):

21D

Code Snippet (add any code snippets that support your topic, if applicable):