Answering What-Happens-If Accounting Questions

Introduction

Transaction questions are the part of an accounting interview where good candidates most often lose their way. The question is short, "what happens to the three statements if a company writes down $50 of goodwill?", and the knowledge needed is usually modest. What goes wrong is the delivery: a candidate starts on the balance sheet, jumps to cash, forgets the tax effect, then tries to repair the answer while the interviewer watches.

The fix is a routine that is the same every time, so that under pressure the candidate is following steps rather than improvising. The accounting method behind it, and the patterns that classify any transaction, are set out in tracing any transaction through the statements. This article is about using that method aloud: what to settle before starting, how to say the answer and how to check it before finishing.

Most wrong answers are answers to a slightly different question. Before saying anything about the statements, take a few seconds to settle the assumptions that change the result, and say them out loud so the interviewer can correct them.

The first is tax. Ask or state the rate, and use whatever the interviewer gives; if they leave it open, choose a round number such as 25% and say so. Then decide whether the item is deductible. Most expenses are, but some common interview items are not, or not yet: a goodwill impairment usually has no tax effect, and an accrued legal settlement is typically deductible only when it is paid, under the economic performance rules in Section 461 of the tax code, which creates the timing difference described in deferred taxes on the three statements.

Timing and Form of Payment

The second is timing. "The company buys a machine" can mean the moment of purchase, when only cash and equipment change, or the end of the year, after depreciation and perhaps interest. Saying "at the moment of purchase, then I can roll it to year end" answers both and shows control. The last is the form of payment: cash, credit, debt or stock each produce a different set of effects.

Once the assumptions are set, walk the statements in a fixed order: income statement, cash flow statement, balance sheet. The order is not arbitrary. The income statement produces net income, which starts the cash flow statement; the cash flow statement produces the change in cash, which lands on the balance sheet; and the balance sheet is where the answer is checked.

On each statement, say the effect and keep a running total. For a $100 increase in revenue collected in cash with a 25% tax rate, the answer sounds like this: revenue up $100, taxes up $25, net income up $75; on the cash flow statement, net income up $75 with no adjustments, so cash up $75; on the balance sheet, cash up $75 on the asset side and retained earnings up $75 on the other, so it balances. Each sentence hands a number to the next, which makes the answer easy to follow and easy to check.

Two Habits That Keep It Clean

Two habits keep the sequence clean. Name the line, not just the statement, so "operating cash flow" rather than "the cash flow statement goes up". And stay on one statement until its effects are finished, because returning to an earlier statement midway through is where most candidates lose track of their own numbers.

The last ten seconds of an answer are the most valuable. Before saying "and that's it", run three checks, silently or aloud:

If all three hold, the answer is almost certainly right. If one fails, it points to the error: a cash mismatch usually means a missed add-back or a missing investing or financing line, and an equity mismatch usually means the tax effect was dropped somewhere. The full logic of the check is in the balance check.

A fourth check is intuition. A non-cash charge should never reduce cash; a purchase of an asset should never touch net income at the moment it happens; a financing transaction should not change equity unless it involves shares or dividends. If the answer violates one of these, look again before finishing.

Goodwill impairment is a favorite because it combines a non-cash charge with a tax trap. Goodwill created when a company is bought through a stock acquisition, without an election to treat the deal as an asset purchase, has no tax basis, and even goodwill that is deductible for tax is amortized over 15 years under Section 197 regardless of the book write-down, so the standard interview assumption is that an impairment produces no tax saving.

Said aloud, the answer takes about twenty seconds: "Assuming the impairment isn't deductible, operating expenses rise by fifty and net income falls by fifty, with no tax effect. On the cash flow statement, net income is down fifty, but the impairment is non-cash, so it's added back and cash is unchanged. On the balance sheet, goodwill falls by fifty and retained earnings falls by fifty, so it balances." The check confirms it: no change in cash on either statement, equity down by exactly the fall in net income, and both sides of the balance sheet down by $50. The accounting behind the charge is covered in goodwill and goodwill impairment.

Interviewers sometimes ask about an item the candidate has never studied. The routine still works, because any transaction can be classified with three questions: does it affect the income statement now, does cash move now, and which balance sheet items change? Answering those aloud, and then following the sequence, produces a reasoned answer to almost anything, and interviewers credit the reasoning even if a detail is off.

Multi-Step and Multi-Year Questions

Longer questions, such as borrowing to buy equipment, depreciating it over two years and then selling it, are a series of single transactions. Take them one period at a time, finish each with the balance check and carry the ending balances into the next period, the approach shown in multi-year transaction scenarios. Writing the running totals on paper, if the format allows, is better than holding six numbers in memory.

When the Question Moves to Metrics

A transaction answer is often followed by "and what happens to EBITDA?" or "does the company's value change?" Answer from the statements just walked. Higher depreciation lowers earnings before interest and taxes (EBIT) and net income but leaves earnings before interest, taxes, depreciation and amortization (EBITDA) unchanged, because EBITDA is struck before depreciation. A goodwill impairment is usually excluded from adjusted EBITDA as a non-recurring, non-cash item, so adjusted EBITDA is unchanged too. For value, follow the cash: the impairment changes no cash and so no intrinsic value, while a deductible non-cash expense raises cash, and so value, only by the tax it saves. Linking the answer back to cash in this way is what interviewers are usually probing for.

Recovering From a Mistake

Everyone makes arithmetic slips under pressure, and interviewers know it. What matters is noticing. If the check fails, say so plainly, "that doesn't balance, let me find it", and work back through the statements in the same order until the error appears. A candidate who catches and fixes a mistake in front of the interviewer often makes a better impression than one who answered correctly without visibly checking.

Speed comes last. Once the routine is automatic, answers get faster on their own, and an answer that takes thirty seconds and is right will always beat one that takes ten and has to be repaired. The errors that most often derail these answers are collected in common accounting mistakes in interviews.