"Walk me through what happens to the three statements if a company writes down $100 of Goodwill" is a variation on the classic 3-statement change question — but it's designed to catch candidates who pattern-match it to the Depreciation version and assume the same tax-shield mechanic applies. It usually doesn't, and knowing why is what separates a strong answer from an average one.

What the Interviewer Is Actually Testing

On the surface this is another linkage question. Underneath, it's really testing whether you understand that "non-cash" and "tax-deductible" are two separate properties of a charge, not the same thing. A strong answer needs to move through four things, in order:

Income Statement: EBIT falls by the impairment amount, and — unlike Depreciation — Net Income falls by the same full amount, because there is usually no offsetting tax benefit. Cash Flow Statement: the lower Net Income is exactly offset by adding back the non-cash impairment, so Cash Flow from Operations doesn't move at all. Balance Sheet: Goodwill falls by the impairment amount, Retained Earnings falls by the same amount, and cash is untouched — so both sides stay in balance.

A Step-by-Step Way to Structure Your Answer

Interviewers reward candidates who work through this in a fixed order rather than jumping straight to "cash flow is unaffected" without showing the mechanics:

1. State the EBIT impact first. A Goodwill impairment is an operating expense, so a $100 impairment reduces EBIT by exactly $100.

2. Move to Net Income — and flag the tax treatment explicitly. Say out loud that Goodwill impairment is typically not tax-deductible (it has no tax basis, especially in a stock deal), so taxable income and the cash tax bill are unaffected. That means the full $100 EBIT reduction flows straight through to Net Income, with no tax shield cushioning it.

3. Reconcile to cash flow. Start from the new (lower) Net Income and add back the full $100 non-cash impairment. Because there was no tax shield to begin with, this add-back exactly cancels the Net Income hit — Cash Flow from Operations is unchanged.

4. Close the loop on the balance sheet. Goodwill falls by $100, cash doesn't move, and Retained Earnings falls by $100. Assets move by −$100; Liabilities plus Equity also move by −$100 (entirely through equity, since liabilities are unaffected). Stating this explicitly is what shows you actually traced the mechanic rather than asserting the conclusion.

You can work through every one of these steps with real numbers, a full given-data table, and a complete balance check in 3-Statement Change: Write Down Goodwill by $100, which is built exactly around this interview question.

Common Ways Candidates Lose Points

The single most common mistake is assuming this question works exactly like the Depreciation version and mechanically applying a tax shield — stating that Net Income falls by only the after-tax amount and that Cash Flow from Operations rises, when in most cases neither is true for a Goodwill impairment. A second mistake is stopping after the income statement and cash flow statement without touching the balance sheet, even though "walk me through the three statements" explicitly asks for all three. A third is conflating impairment with amortization — under current GAAP and IFRS, Goodwill is generally not amortized on a schedule; it's tested for impairment instead.

Build the Foundation First

This question assumes you're already comfortable with the case where a non-cash charge does carry a tax shield. If the mechanics of 3-Statement Change: Depreciation Increases by $100 or the broader capitalize-versus-expense trade-off in 3-Statement Change: Capitalize vs. Expense $100 still feel shaky, it's worth working through those first — the Goodwill impairment question is really a test of whether you can spot when that familiar mechanic does not apply.

Where This Shows Up Later

The same tax-treatment distinction reappears throughout an interview process: in purchase price allocation questions about how Goodwill is created in the first place, in EBITDA-normalization discussions where analysts add back impairments as non-recurring non-cash items, and in credit or PE due diligence where a large historical impairment is a signal worth investigating rather than a red flag on its own. Getting the "no tax shield" nuance right here is what lets you handle those follow-ups without re-deriving the logic from scratch.