ASC 740 Tax — Core Rule
Under the ASC 740 Tax Rate Change Effect guidance, deferred tax assets (DTAs) and deferred tax liabilities (DTLs) must be remeasured immediately using the newly enacted tax rate, with the full effect recognized in income tax expense from continuing operations in the period of enactment — regardless of when the underlying temporary differences will reverse.
How ASC 740 Tax Works
- Enacted rate governs — not "substantially enacted." ASC 740-10-25-47 requires use of the enacted tax rate expected to apply when the temporary difference reverses. Unlike IFRS (IAS 12), US GAAP does not accept "substantially enacted" legislation; the law must be fully signed into law before a rate change is recognized.
- Immediate remeasurement in the period of enactment. ASC 740-10-35-4 mandates that the effect of a change in tax law or rate be recognized as a discrete item in the period containing the enactment date — not spread over future periods and not allocated to prior periods.
- Effect flows through continuing operations. ASC 740-20-45-8 specifies that the income tax effects of a rate change are recorded in continuing operations, even if the underlying deferred tax balance relates to an item originally recognized in other comprehensive income (OCI), a discontinued operation, or a prior-period item. This is the "intraperiod tax allocation override" for rate changes.
- Exception — certain items initially recognized in OCI ("backward tracing" debate). ASC 740-20-45-11 through 45-12 address "stranded tax effects." When a rate change creates a difference between the tax effect recorded in accumulated OCI (AOCI) and the newly enacted rate, the stranded amount remains in AOCI until the underlying item is reclassified, unless the entity elects to reclassify per ASU 2018-02.
- ASU 2018-02 election for AOCI stranded effects. Entities may elect (accounting policy choice) to reclassify stranded tax effects resulting from the Tax Cuts and Jobs Act (or any future rate change) from AOCI to retained earnings. The election is disclosed under ASC 740-20-45-11A.
- Valuation allowance reassessment required. ASC 740-10-30-17 requires reassessing whether existing valuation allowances on DTAs remain appropriate at the new rate, since the "more-likely-than-not" realizability test is now applied to a remeasured asset amount.
ASC 740 Tax — Practical Example
Assume a calendar-year C-corporation has a single DTL of $210,000 recorded at the old 35% rate (representing $600,000 of taxable temporary differences). Congress enacts a rate reduction to 21% on December 22, Year 1. The DTL must be remeasured to $126,000 ($600,000 × 21%).
Remeasurement calculation
| Amount |
|---|
| DTL at 35% (beginning) | $210,000 |
| DTL at 21% (remeasured) | $126,000 |
| Decrease in DTL | $84,000 |
Journal entry on enactment date (December 22, Year 1)
| Account | Dr | Cr |
|---|
| Deferred Tax Liability | 84,000 | |
| Income Tax Expense — Continuing Operations | | 84,000 |
The $84,000 credit reduces income tax expense, boosting net income in Year 1. Had the balance been a DTA instead, the entry would reverse — increasing income tax expense (a debit) and reducing the DTA — potentially a painful charge for deferred tax assets the company was counting on.
ASC 740 Tax — Common Pitfalls
- Using the proposed or "expected" rate instead of the enacted rate. A common audit finding is remeasuring DTAs/DTLs when legislation passes one chamber of Congress or is announced publicly. ASC 740-10-25-47 is explicit: recognition is triggered only on the date the bill is signed into law, not on announcement, passage of a house, or presidential commitment.
- Misrouting the rate-change effect to OCI or retained earnings. Controllers sometimes push the remeasurement gain/loss to OCI for items whose originating entries hit OCI (e.g., unrealized securities gains, pension adjustments). This violates ASC 740-20-45-8; the rate-change effect must go through continuing operations. The stranded-effect issue is a separate, subsequent consideration.
- Forgetting to reassess valuation allowances simultaneously. A rate reduction shrinks the gross DTA — but at the same time, the "more-likely-than-not" threshold must be retested. In some cases, a rate increase could make a previously unrecognized DTA more valuable, yet a companion valuation allowance was never released. Auditors will check both calculations in the same period.
ASC 740 Tax — Key Paragraphs
- ASC 740-10-25-47 — Enacted rate requirement; rate used must be the rate expected to apply when the temporary difference reverses.
- ASC 740-10-35-4 — Rate-change effect recognized as a discrete event in the period of enactment; no spreading or retroactive adjustment.
- ASC 740-20-45-8 — All rate-change effects allocated to continuing operations, regardless of the originating category.
- ASC 740-20-45-11 / 45-11A — Stranded tax effects in AOCI; optional reclassification to retained earnings under ASU 2018-02.
- ASC 740-10-30-17 — Valuation allowance assessment using "more-likely-than-not" standard; must be retested upon remeasurement.
