"Walk me through what happens to the three statements if Depreciation increases by $100" is one of the most common accounting mechanics questions in finance interviews — asked at bulge-bracket banks, mid-market shops like Lincoln International and Houlihan Lokey, and by PE funds screening for basic modeling literacy. It's a short question, but it's designed to expose candidates who have memorized definitions without understanding how the statements actually connect.

What the Interviewer Is Actually Testing

This question isn't really about depreciation in isolation — it's a linkage test. A strong answer needs to move through four things, in order, without getting the direction of any single one wrong: Income Statement — EBIT falls by the increase in D&A, and Net Income falls by the after-tax amount. Cash Flow Statement — Net Income is lower, but D&A is added back in full as a non-cash item, so Cash Flow from Operations actually rises. Balance Sheet — PP&E falls by the D&A increase, cash rises by the net cash benefit, and Retained Earnings falls to match the Net Income hit, so both sides stay in balance.

A Step-by-Step Way to Structure Your Answer

Interviewers consistently reward candidates who work through the mechanic in a fixed order rather than jumping around. A reliable structure:

Step 1: State the EBIT Impact

1. State the EBIT impact first. D&A is an operating expense, so a $100 increase reduces EBIT by exactly $100 — no tax adjustment yet.

Step 2: Move to Net Income

2. Move to Net Income. Subtract interest (unchanged) and apply the tax rate to get the after-tax hit. At a 25% (0.25) tax rate, a $100 EBIT reduction becomes a $75 Net Income reduction.

Step 3: Reconcile to Cash Flow

3. Reconcile to cash flow. Start from the new (lower) Net Income and add back the full $100 of extra D&A. Net effect: Cash Flow from Operations goes up by $25 — the tax shield.

Step 4: Close the Loop on the Balance Sheet

4. Close the loop on the balance sheet. PP&E falls by $100, cash rises by $25, and Retained Earnings falls by $75. Assets move by −$75; Liabilities + Equity also move by −$75. Stating this explicitly — not just asserting "it balances" — is what separates a strong answer from an average one.

You can walk through every one of these steps with real numbers, an explicit given-data table, and a full balance check in 3-Statement Change: Depreciation Increases by $100, which is built exactly around this interview question.

Common Ways Candidates Lose Points

The most frequent mistake is assuming Net Income and Cash Flow from Operations move in the same direction — they don't, and stating otherwise is an immediate red flag for an interviewer. A close second is forgetting to apply the tax rate at all (treating the cash flow benefit as the full $100 instead of just the tax shield), and a third is stopping at the cash flow statement without ever touching the balance sheet, even though "walk me through the three statements" explicitly asks for all three.

Build the Foundation First

This question assumes fluency with each statement individually before combining them. If any of the individual statements still feel shaky, it's worth working through Walk Me Through the Income Statement, Walk Me Through the Balance Sheet, and Walk Me Through the Cash Flow Statement, then the full linkage case, Connect the Three Statements, before attempting scenario-based changes like this one.

Where This Shows Up Later

The same D&A tax-shield logic reappears throughout a finance interview process — in unlevered free cash flow build-ups for a DCF, in LBO debt schedules where D&A drives the cash available for debt paydown, and in CapEx-versus-expense questions. Getting the sign and magnitude right here, cold, is what lets you move quickly through those more complex questions later instead of re-deriving the mechanic from scratch each time. The full conceptual explanation of why the tax shield exists in the first place — not just how to walk through the mechanic in an interview — is covered in why depreciation increases cash flow even though it lowers net income, which is worth reading as the companion "why" article to this "how do I answer it" framework.

Practicing the Same Framework Against a Different Number

Interviewers occasionally vary this question by changing the tax rate or the size of the D&A increase specifically to test whether a candidate has memorized the $100-at-25%-tax example or actually understands the underlying relationship. Suppose D&A instead increases by $240 and the tax rate is 30% rather than 25%. Applying the same four-step structure: EBIT falls by the full $240. Net Income falls by the after-tax amount, $240 × (1 − 0.30) = $168. Cash flow from operations starts from that lower Net Income and adds back the full $240 of D&A, so Cash Flow from Operations actually rises by $72 relative to the no-change baseline — precisely the tax shield, $240 × 0.30. On the balance sheet, PP&E falls by $240, cash rises by $72, and Retained Earnings falls by $168, keeping both sides moving by the same −$168. A candidate who can run this exact structure against unfamiliar numbers — rather than reciting the $100-at-25% example verbatim — demonstrates real command of the mechanic rather than memorization.

How This Question Escalates at the Associate Level

At the analyst level, interviewers are typically satisfied once a candidate correctly walks through all four steps with the right signs and magnitudes. At the associate level, the same question often escalates into a request to explain why this mechanic matters for real decision-making — for instance, why a private equity sponsor evaluating an LBO target cares about the D&A tax shield when sizing how much debt the business can support, or why two companies with identical EBITDA can show meaningfully different Net Income purely because of different depreciation schedules or asset ages. Being ready to pivot from "here is the mechanical walkthrough" to "here is why this matters for a real financial decision" is what distinguishes a strong associate-level answer from a merely correct analyst-level one.

A Pre-Interview Checklist for This Question

Before an interview where this topic might come up, it's worth confirming: can you state the EBIT impact without hesitation; can you correctly apply the tax rate to get the after-tax Net Income impact; can you explain why Cash Flow from Operations moves in the opposite direction from Net Income; and can you close the loop on the balance sheet by naming all three accounts that move (PP&E, cash, Retained Earnings) rather than just asserting that it balances. If any of these feel shaky, revisit the individual statement walkthroughs linked above before attempting the combined question again.

Why Interviewers Prefer This Question Over a Pure Definition Question

A candidate could, in principle, be asked simply to "define depreciation" — but interviewers overwhelmingly prefer the scenario-based version because it can't be answered from memorized flashcards alone. Defining depreciation only tests vocabulary; walking through its effect on all three statements tests whether a candidate has actually internalized how an income statement expense, a cash flow add-back, and a balance sheet account all move together as a single system. This is exactly why "3-statement change" questions of this style — not just for depreciation, but for stock issuances, loan drawdowns, and working capital changes — have become a fixture of technical interviews at every level from summer analyst to associate: they compress a large amount of testable understanding into a single, short prompt.

What Happens if the Depreciation Change Is a Decrease Instead

Interviewers sometimes flip the direction of the question and ask about a decrease in D&A instead of an increase, specifically to check whether a candidate has actually internalized the mechanic rather than memorized a fixed direction of movement. The logic runs in exact reverse: a $100 decrease in D&A raises EBIT by $100, raises Net Income by the after-tax amount ($75 at a 25% tax rate), but this time Cash Flow from Operations rises by less than Net Income does — in fact it rises by only $25, the mirror image of the tax shield, because there's now $100 less of a non-cash expense to add back even though Net Income itself went up. On the balance sheet, PP&E rises by $100 (less depreciation taken means more asset value remains), cash rises by only $25, and Retained Earnings rises by the full $75. A candidate who can flip the direction cleanly, rather than getting confused about which way cash flow moves relative to Net Income, demonstrates the kind of flexible understanding interviewers are actually screening for.

How This Connects to Reading Real Financial Statements

Beyond the interview room, this exact mechanic is what allows an analyst to explain, when looking at a real company's financial statements, why its Cash Flow from Operations differs from its Net Income in a given year. A company that recently completed a large capital expenditure program will show a jump in D&A in subsequent years, which depresses Net Income relative to what it would otherwise be, while simultaneously boosting Cash Flow from Operations relative to Net Income through the same add-back and tax-shield mechanic tested in this interview question. Recognizing this pattern when scanning a real 10-K or annual report — rather than only being able to reproduce it for a hypothetical $100 change — is what separates interview preparation that actually builds durable skill from preparation that only optimizes for passing the specific question asked.

Delivering the Answer Verbally Under Time Pressure

Because this question is almost always asked verbally rather than on paper, part of answering it well is managing the pace and structure of the spoken explanation, not just getting the arithmetic right. A common failure mode is racing straight to the final numbers without narrating the logic in between — an interviewer who hears "cash flow goes up by $25" with no explanation of why has no way to distinguish a candidate who understands the tax shield from one who simply memorized the answer to this specific prompt. A better approach is to narrate each of the four steps out loud in order, pausing briefly after each one, so the interviewer can follow the reasoning and, if needed, redirect before a small error compounds into a completely wrong final answer. Candidates who practice saying the framework out loud — not just working it out silently on paper — tend to perform noticeably better in the actual interview setting, since the spoken and written versions of this kind of answer require slightly different skills.

How to Recover If You Make a Sign Error Mid-Answer

Even well-prepared candidates occasionally state a number with the wrong sign under interview pressure — for instance, saying Cash Flow from Operations falls when it should rise. The strongest recovery is to catch the error yourself, out loud, rather than hoping the interviewer doesn't notice: something like "wait — let me correct that, Cash Flow from Operations actually rises here because of the tax shield" signals far more competence than either silently pushing through an inconsistent answer or freezing entirely. Interviewers are generally more interested in whether a candidate can self-correct and reason clearly under pressure than in whether the very first word out of their mouth was perfectly accurate, since real modeling work always involves catching and fixing small errors along the way rather than getting everything right in one uninterrupted pass. Treating a self-caught mistake as a normal part of a competent answer, rather than as a disqualifying failure, is itself part of genuine interview readiness, and it's a skill worth practicing deliberately before the real conversation.