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@Good-Golden wrote:

This is a C-Corp.  I simply used Turbotax Business (downloaded version, 2019) and performed the steps I outlined.   $1556 using 3 year straight-line works out to be $43 per month.  Sep-Oct-Nov-Dec 2019 is $172.92.  $311 is the straight-line 5-year depreciation for entire year.  Why is Turbotax not calculating for the months used?


 

A computer uses 5 years, not 3 years.  You need to use 5 years.

 

The depreciation is not monthly.  You most likely are required to use the 1/2-year convention, which means the first year gets 1/2 a year of depreciation (if you placed more assets in service Oct-Dec, that MIGHT change things).

 

So a $1556 computer depreciated over 5 years should give you about $156 the first year.