Equine Tax Fairness Act This bill modifies the tax treatment of gains and losses from the sale of depreciable property used in a trade or business to eliminate horses from the definition of livestock (thus making the 24-month holding period requirement for livestock inapplicable to horses and allowing horses to be treated as capital assets subject to the existing 1-year holding period requirement for long-term capital gains). The bill also makes permanent the 3-year recovery period for the depreciation of race horses.