Examples of positive evidence cited by the FASB to indicate that a valuation allowance for the tax benefits from a deferred tax asset is not needed include all of the following, except a. existing contracts sales backlogs that will produce sufficient taxable income b. excess of fair market value over the tax basis that is sufficient enough to realize the deferred tax asset a history of using operating loss carryforwards a strong earnings history exclusive of the loss that created the deferred tax asset .