Is goodwill amortized under current US GAAP/IFRS? How is it tested and adjusted over time?

What the interviewer is actually testing

This cluster of topics tests whether you can hold several related-but-distinct concepts apart cleanly under pressure -- a common failure mode is conflating goodwill amortization, which does not happen, with intangible amortization, which does happen, or getting the DTA/DTL direction backwards.

1. You state clearly that goodwill is not amortized but intangibles with finite lives are. This is the single most tested fact in the topic. A candidate who says goodwill amortizes over some fixed period immediately signals they have not internalized post-2001 US GAAP (SFAS 142) or current IFRS accounting, which replaced goodwill amortization with annual impairment testing.

2. You can explain the DTA/DTL direction from first principles, not memorization. Saying accelerated tax depreciation creates a deferred tax liability should come with the why: tax depreciation is higher than book depreciation early in an asset's life, so the company pays less cash tax than its book tax expense implies, and that gap is owed later -- hence a liability.

3. You understand goodwill impairment is a real, cash-flow-neutral event that still matters. Interviewers probe whether you understand that a goodwill impairment reduces net income and equity but has zero cash impact -- yet still matters because it signals the acquirer overpaid or the acquired business underperformed, which is a real, if backward-looking, signal about capital allocation quality.

4. You can connect deferred taxes to a DCF or LBO context. A strong candidate volunteers that deferred tax liabilities are typically handled carefully within net debt calculations, and that in an LBO, a step-up in tax basis from an asset purchase versus a stock purchase can create additional tax-deductible amortization, boosting after-tax cash flow -- a nuance that separates strong technical candidates from average ones.

Keep the core definitions crisp and instant; the differentiation happens in the impairment triggers, valuation allowances, and LBO tax basis follow-ups.

Common traps

Trap 1: Saying goodwill is amortized. This is the single most common error in the entire topic. Under current US GAAP and IFRS, goodwill is not amortized -- it is tested for impairment at least annually.

Say it out loud: Goodwill is not amortized under current accounting rules -- it sits on the balance sheet indefinitely and is only written down through an impairment test, not a scheduled amortization charge.

Trap 2: Getting the DTA/DTL direction backwards. Candidates sometimes say accelerated tax depreciation creates a deferred tax asset. It creates a liability, because the company is paying less cash tax now than its book tax expense suggests, and it will owe that difference later as the timing reverses.

Say it out loud: Accelerated tax depreciation means the company pays less in cash taxes today than its book tax expense implies, and that deferred amount is owed in the future -- so it's a liability, not an asset.

Trap 3: Treating a goodwill or asset impairment as a cash expense. Candidates model an impairment charge as reducing the cash balance. It is entirely non-cash -- it reduces the asset's book value and pre-tax income, with the cash effect having already occurred when the asset was originally acquired.

Say it out loud: An impairment charge is non-cash -- it writes down the asset's carrying value and hits pre-tax income, but no cash actually moves in the period the impairment is recorded, so it gets added back on the cash flow statement.

Trap 4: Confusing goodwill with identifiable intangible assets. Candidates lump all deal-related intangibles together. Goodwill is the unidentifiable residual; things like customer relationships, developed technology, and trademarks are separately identified, valued, and often amortized (if finite-lived) in the purchase price allocation.

Say it out loud: Goodwill is the residual plug for value the acquirer paid that isn't attributable to any specific identifiable asset -- customer relationships, technology, and trademarks are separately valued in the purchase price allocation and, if finite-lived, are amortized on their own schedules.

Trap 5: Assuming a deferred tax asset is always fully usable. Candidates forget that a DTA's value depends on the company generating enough future taxable income to use it. If realization is not more likely than not, a valuation allowance must be recorded against the DTA, reducing its net carrying value.

Say it out loud: A deferred tax asset is only as valuable as the company's ability to generate future taxable income to use it -- if that's not more likely than not, a valuation allowance is recorded to write the DTA down to a realistic net value.

Trap 6: Assuming goodwill impairment can be reversed once recorded. Under US GAAP, once goodwill is written down, it can never be written back up, even if the business subsequently recovers. This is a one-way ratchet, unlike some other assets.

Say it out loud: Under US GAAP, a goodwill impairment is permanent -- it can never be reversed even if the acquired business later performs better, which is different from the treatment of some other impaired assets under IFRS.