If you have a copy of your 2014 tax return when the asset was first placed in service, there should be a form 4562 included which has the date placed in service. That is the date you enter. The schedule C should have the 2014 depreciation. On the 2015 tax return, there will be no form 4562, but you can get the 2015 depreciation from the schedule C. That will provide the information you need. Add the 2014 and 2015 depreciation together and that will be the "prior depreciation" you enter on the 2016 return.
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