Regulation 39-22-504(2). 
(1) 	The Colorado net operating loss of a C corporation is computed in the same manner as a federal net operating loss except that the Colorado loss is computed using the modified federal income allocated and apportioned to Colorado.
(2)	Limitations on the amount of net operating loss that may be carried over where such loss was obtained by the acquisition of one C corporation by another as contained in Section 382 of the Internal Revenue Code shall also apply for Colorado income tax purposes.
(3) 	
(a) 	For the tax years beginning prior to January 1, 1984, the Colorado C corporation net operating loss could be carried back and forward to the same years to which a federal net operating loss could be carried.
(b) 	For tax years beginning on or after January 1, 1984, but prior to August 6, 1997, Colorado C corporation net operating losses may be carried forward for fifteen years. They may not be carried back to an earlier year.
(c) 	For tax years beginning on or after August 6, 1997, Colorado C corporation net operating losses may be carried forward for twenty years. They may not be carried back to an earlier year.
(4)	For income tax years beginning prior to January 1, 2009, §39-22-504(5), C.R.S. provided that a C corporation could not carry forward a net operating loss to any year in which the taxpayer used a different method of allocating or apportioning income from the method used in the year in which the loss occurred.  For tax years beginning on or after January 1, 2009, a C corporation may carry forward a net operating loss from any year, regardless of the method used to allocate or apportion income in such year, to any tax year beginning on or after January 1, 2009.