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@Bentax wrote:

A previous preparer used 150DB depreciation for a home office improvement.  I can't replicate this without getting an error.  How do i continue to use the same depreciation method used in the past?

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Just to double check, this improvement was to the structure of the house, that would be depreciated over 39 years, right?

If so, 150DB is not allowed.  For the most part it can only be straight line.

If last year was the first year it was "placed in service", you can just report it correctly this year, and ideally amend last year to correct it.

If it was "placed in service" more than one year ago (and wrongly used 150%DB in the first two years), you need to file Form 3115 to correct the error and start doing it correctly.

As was mentioned, it is extension time.