Net deferred tax assets consist of the following:
| December 31, | December 31, | |||||||
| 2016 | 2015 | |||||||
| Deferred tax assets | 11,880,000 | 10,310,000 | ||||||
| Valuation allowance | (11,880,000 | ) | (10,310,000 | ) | ||||
| Net deferred tax asset | $ | – | $ | – | ||||
Deferred tax assets consist primarily of net operating loss carryforwards, stock options issued for services and impairment expense. Management has elected to provide a deferred tax asset valuation allowance equal to the potential benefit due to our history of losses. If we demonstrate the ability to generate future taxable income, management will re-evaluate the allowance. The increase in the valuation allowance of approximately $1,700,000 during the year ended December 31, 2016 primarily represents the benefit of the change in net operating loss carry-forwards and change of fair value of the derivative liability during the period. The increase in the valuation allowance of approximately $400,000 during the year ended December 31, 2015 primarily represents the benefit of the change in net operating loss carry-forwards during the period. As of December 31, 2016, our estimated net operating loss carry-forward is approximately $24,000,000 and will expire beginning in 2032 through 2036. Internal Revenue Code Section 382 limits the ability to utilize net operating losses if a 50% change in ownership occurs over a three-year period. Such limitation of the net operating losses may have occurred but we have not analyzed it at this time as the deferred tax asset is fully reserved.
The Company’s predecessor operated as an entity exempt from federal and state income taxes. The Company has not yet filed tax returns for 2013, 2014, 2015 and 2016, which are subject to examination.