It must be determined that there is more than a 50% probability that the company will have positive accounting income in the next fiscal period before the deferred tax asset can be applied.
If, for example, a company has a deferred tax asset of $25,000 on its balance sheet, and then the company earns $75,000 in before-tax accounting income, accounting tax expense will be applied to $50,000 ($75,000 - $25,000), instead of $75,000.