A deferred tax asset and a deferred tax liability are opposite entries on a company’s balance sheet that both arise from timing differences between financial reporting and tax reporting. A deferred tax asset (DTA) represents taxes the company has effectively prepaid or a future tax benefit it hasn’t yet used. A deferred tax liability (DTL) represents tax the company will owe in the future but hasn’t paid yet. Both are measured by multiplying the dollar amount of the timing gap by the federal corporate rate of 21%, plus any applicable state rate.1Office of the Law Revision Counsel. 26 U.S. Code 11 – Tax Imposed The difference between them comes down to direction: which set of books is ahead in the current period, and which way the reversal will run.
Why the Gap Exists in the First Place
Public companies keep two sets of books. Generally Accepted Accounting Principles, issued by the Financial Accounting Standards Board, govern the financial statements filed with the SEC.2Securities and Exchange Commission. Final Rule: Disclosure Update and Simplification The Internal Revenue Code governs the taxable income reported to the IRS. The two frameworks often disagree about when a dollar of revenue or expense should be counted, and each disagreement produces what accountants call a temporary difference.
The word “temporary” is doing real work. These gaps are expected to reverse: the asset gets used up, the liability gets paid, the revenue eventually becomes taxable. Because the gap closes over time, it needs to be tracked, and that tracking is what deferred tax accounting does.
Permanent differences are a separate category and don’t create deferred tax items at all. The dividends-received deduction is one: a corporation can deduct a portion of dividends received from another domestic corporation on its tax return, but GAAP records no corresponding item.3Office of the Law Revision Counsel. 26 USC 243 – Dividends Received by Corporations That gap never closes, so no DTA or DTL is recorded.
What Creates a Deferred Tax Liability
A DTL appears when book income exceeds taxable income in the current period. The company has deferred part of its tax bill into the future, and the DTL is the balance sheet marker for that postponed payment.
Depreciation is the single biggest source. Financial statements typically use straight-line depreciation, spreading an asset’s cost evenly over its useful life. The tax code allows the Modified Accelerated Cost Recovery System, which front-loads deductions into the early years.4Internal Revenue Service. Publication 946, How To Depreciate Property The bigger early tax deduction pulls taxable income below book income and creates a DTL.
A quick example. A company buys equipment for $1 million and depreciates it over ten years on the books at $100,000 per year. MACRS might allow $200,000 in Year 1. The $100,000 gap times 21% produces a $21,000 DTL that year. In later years, when tax depreciation drops below book depreciation, the DTL reverses and the deferred tax is paid.
Bonus depreciation makes this effect much larger. Under the One Big Beautiful Bill Act signed in 2025, businesses can deduct 100% of the cost of qualified property in the year it’s placed in service for assets acquired after January 19, 2025.5Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One Big Beautiful Bill Writing off the entire asset in Year 1 for tax while depreciating it over a decade for books produces a large DTL that unwinds slowly over the remaining life.
What Creates a Deferred Tax Asset
A DTA is the opposite. Taxable income exceeds book income in the current period, so the company has effectively prepaid tax or built up a benefit it can use later.
Accrued expenses are a common source. GAAP requires the company to book the expense when it’s incurred, but the tax code often waits until cash actually moves. Warranty costs work this way. A manufacturer records the estimated warranty expense when the product ships, but the IRS allows the deduction only when claims are paid. During the gap, taxable income runs above book income and the future tax benefit sits on the balance sheet as a DTA.
Net operating losses are another major source. For NOLs arising in tax years beginning after December 31, 2017, the loss carries forward indefinitely and can offset up to 80% of taxable income in any future year.6Office of the Law Revision Counsel. 26 USC 172 – Net Operating Loss Deduction The 80% ceiling was suspended by the CARES Act for tax years 2018 through 2020 and is back in force for tax years beginning after 2020. A $10 million NOL carryforward produces a DTA of $2.1 million at the federal rate.
Stock-based compensation creates a DTA on a similar mechanism. Under GAAP, the company records compensation expense over the vesting period based on the grant-date fair value. For tax, the deduction comes later, when options are exercised or restricted stock vests. Book expense runs ahead of the tax deduction during vesting, producing a DTA. The DTA is based on cumulative book compensation cost and isn’t adjusted for stock price movement before settlement.
The Key Asymmetry: Valuation Allowances
This is where DTAs and DTLs stop being mirror images. A DTL is recorded at face value; no further test applies. A DTA has to pass a recoverability check. If it is “more likely than not” (a likelihood greater than 50%, under ASC 740-10-25-6) that some or all of the DTA won’t be realized, the company must record a valuation allowance to reduce its carrying value.
The valuation allowance is a contra-asset that offsets the gross DTA. Any change to it runs through income tax expense, so establishing or releasing an allowance can swing reported earnings in either direction. A profitable company that concludes it no longer needs its allowance and releases it will see earnings jump. A company piling up losses that adds an allowance will see earnings drop. Analysts pay attention to these adjustments because they reflect management’s forward view of the company’s tax position.
ASC 740 treats three years of cumulative pretax losses as significant negative evidence, hard to overcome with projections. When weighing whether the DTA is realizable, one supporting factor is the existence of DTLs on the same books. Reversing taxable temporary differences will generate future taxable income, which the deductible temporary differences can then absorb. So the two accounts, opposite as they are, can support each other in the analysis.
How Rate Changes Hit Each Side Differently
Deferred tax balances are measured at the tax rate enacted in law that will apply when the difference reverses. Enacted means signed, not proposed. When a new rate takes effect, every existing DTA and DTL is remeasured in the period of enactment, and the entire adjustment flows through income tax expense.
Rate cuts and rate hikes push DTAs and DTLs in opposite directions. When the Tax Cuts and Jobs Act dropped the federal rate from 35% to 21% in December 2017, companies with large DTLs booked one-time gains because their future tax obligations shrank. Companies with large DTAs booked losses because their future tax benefits became less valuable. A rate increase would produce the reverse. State rate changes work the same way but with smaller dollar effects; state corporate rates run from about 2% to 11.5% across the 44 states with a corporate income tax, with a median near 6.5%.
How They Appear on the Balance Sheet
All deferred tax assets and liabilities are classified as noncurrent, regardless of when the underlying difference is expected to reverse.7Financial Accounting Standards Board. Accounting Standards Update No. 2015-17: Balance Sheet Classification of Deferred Taxes
Netting happens within a jurisdiction, not across jurisdictions. DTAs and DTLs belonging to the same tax jurisdiction and the same tax-paying entity are netted into a single balance sheet number. A $5 million federal DTA offset by a $3 million federal DTL shows up as a single $2 million net DTA. But a U.S. federal DTA and a foreign DTL stay separate. That’s why a multinational’s balance sheet can show both a net DTA and a net DTL at the same time, one for each jurisdiction.
Where to Find the Detail
The balance sheet gives you a net number. The income tax footnote gives you the composition. Public companies disclose every significant component of their gross DTAs and DTLs, the total valuation allowance, and how it changed year over year. The footnote also includes an effective tax rate reconciliation showing why the company’s actual rate differs from 21%, with common reconciling items like state taxes, foreign rate differences, credits, nondeductible expenses, and valuation allowance movement.8Financial Accounting Standards Board. Improvements to Income Tax Disclosures To see whether a company’s deferred tax position is loaded toward future benefits or future obligations, that footnote is the place to read.