What happens to the deferred tax asset if they aren't expected to reverse?

What happens to the deferred tax asset if they aren’t expected to reverse? I think you subtract the value from comprehensive income? What would happen if the opposite was true?

you substract them from NI in the Non cash charge expense while calculating FCFE/FCFF

I just looked it up, it says shortfalls are subtracted from paid in capital and then if it is not enough, it goes to the income statement. Any increases in Deferred tax asset, increases Paid in capital.