A deferred tax asset or liability arises when there's a timing difference between how income or expenses are recognized for accounting purposes versus for tax purposes, representing tax that will be paid or saved in a future period rather than the current one.
A deferred tax asset is future tax savings, for example from a net operating loss that can offset taxable income in a later profitable year. A deferred tax liability is future tax owed, for example from an expense taken for book purposes now that will be taxable when it's actually realized on a tax return in a later year.
These show up on the balance sheet as real assets and liabilities, even though no cash has changed hands yet, precisely because accrual accounting and tax law don't always recognize the same transaction in the same period. Section 174's amortization requirement is a concrete recent example of a rule change that created significant new deferred tax positions for R&D-heavy companies almost overnight.
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