Pruett Corporation began operations in 2015 and appropriately recorded a deferred tax liability at the end of 2015 and 2016 based on the following depreciation temporary differences between pretax financial income and taxable income:

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Income Tax Financial Year Depreciation Depreciation 2015 $800 $400 2016 600 400 2017 400 400 2018 200 400 2019 0 400