How to Answer the '$100 Loan' 3-Statement Interview Question

The "$100 loan" prompt is a classic 3-statement interview question, and it rewards candidates who answer it with a structure, not a stream of consciousness. Here's a four-step framework you can reuse for this question and for most other "walk me through what changes" prompts.

Step 1: Separate the Transaction From Its Ongoing Cost

Before touching any numbers, say out loud that this question has two parts: what happens the moment the loan is issued, and what happens afterward as it accrues interest. Naming this distinction upfront signals to the interviewer that you're not going to conflate a financing event with an operating one.

Step 2: Walk Through the Immediate (Day 0) Impact

On day one, a $100 loan is purely a balance sheet event:

Cash rises by $100 (asset side)
Debt rises by $100 (liability side)

Say explicitly that Net Income is unaffected and the balance sheet still balances because both sides moved by the same amount. This is worth stating even though it sounds obvious — it's the detail interviewers listen for.

Step 3: Layer In the Interest Expense

Once you've covered Day 0, move to the ongoing effect: the loan accrues interest. Using an illustrative 5% (0.05) rate on the $100 loan gives $5.00 of annual interest expense. State the formula out loud — Interest Expense = Loan Amount × Interest Rate — before plugging in numbers; interviewers want to hear the logic, not just the answer.

Step 4: Don't Forget the Tax Shield

This is the step that separates strong answers from average ones. Interest expense is tax-deductible, so the actual hit to cash and Retained Earnings is the after-tax interest, not the full pre-tax figure. At a 25% (0.25) tax rate, $5.00 of pre-tax interest becomes a $3.75 after-tax reduction to Net Income, Cash Flow from Operations, and Retained Earnings. Candidates who stop at the pre-tax number are giving an incomplete answer even if their formula was right.

Putting It Together

The Full Worked Version

For the full worked version of this answer — including the starting balance sheet, the assumptions you're allowed to state out loud, and the complete after-tax cash flow bridge — go through 3-Statement Change: Take Out a $100 Loan line by line.

Common Ways Candidates Lose Points on This Question

• Putting an income statement impact on Day 0, before any interest has accrued
• Using the pre-tax interest expense as the cash and Retained Earnings impact instead of the after-tax figure
• Double-counting the $100 by running it through both Cash Flow from Financing and Cash Flow from Operations
• Assuming the loan amortizes (reduces Debt) when the question specifies an interest-only loan

Practice the Rest of the "$100 Change" Family

Interviewers rotate through several variants of this prompt, and each one tests a different mechanical link between the statements: a revenue increase, a depreciation increase, and an inventory purchase for cash. Working through all of them back to back is the fastest way to build the pattern-recognition interviewers are actually testing for.

Why This Four-Step Structure Works for Any "Walk Me Through" Question

The structure in this article — separate the transaction from its ongoing cost, walk the immediate impact, layer in the recurring effect, and don't forget the tax treatment — isn't specific to loans. It's a general-purpose template for any question that asks how a single change ripples across the three statements.

Why Issuance Alone Has No P&L Impact

The reasoning behind why the loan issuance itself has zero income statement impact, and why that changes once interest starts accruing, is explored in more conceptual depth in How Does Taking Out a Loan Affect the 3 Financial Statements?, which is worth reading as the companion "why" article to this "how do I answer it" framework.

Delivering This Answer Under Time Pressure

Because this question is almost always asked verbally, pacing the four steps matters as much as getting each one correct. A common mistake is rushing through Step 1 — the framing statement that separates the transaction from its ongoing cost — because it feels like throat-clearing rather than substance. In practice, that opening line is what tells the interviewer you have a structure at all, before you've said a single number. A better approach is to treat Step 1 as a deliberate, unhurried sentence, then move through Steps 2 through 4 at a steady pace, pausing briefly between each one so the interviewer can follow the logic rather than trying to keep up with a rapid-fire list of numbers.

How This Question Escalates at the Associate Level

At the analyst level, interviewers are typically satisfied once a candidate correctly runs through all four steps with the right signs and lands on the correct after-tax figures. At the associate level, the question often extends into a follow-up about why the tax shield matters beyond this specific example — for instance, why private equity sponsors deliberately use more debt than a typical corporate balance sheet would carry, precisely to capture a larger tax shield and improve equity returns in a leveraged buyout. Being ready to connect the mechanical four-step answer to this broader "why does leverage matter" question is what separates a strong associate-level answer from a merely correct analyst-level one.

A Pre-Interview Checklist for This Question

Before an interview where this exact framing might come up, it's worth confirming: can you state the two-part structure — issuance versus ongoing cost — as your opening line, rather than diving straight into numbers; can you correctly state that Day 0 has zero income statement impact; can you compute the annual interest expense given a loan amount and rate; and can you correctly apply the tax rate to land on the after-tax Net Income, cash flow, and Retained Earnings impact rather than stopping at the pre-tax figure. If any of these feel shaky, revisit the full worked case and the companion explainer article linked above before attempting the combined question again.

Why Interviewers Keep Coming Back to This Question Format

The "$100 change" format — applied here to a loan, and elsewhere to revenue, depreciation, and inventory — persists across interview processes because it's short to ask, hard to answer well from memorization alone, and immediately reveals whether a candidate has a repeatable structure or is improvising each time. A candidate who can produce the same clean four-step answer regardless of which variant is asked demonstrates that they've internalized the underlying logic of how the three statements connect, rather than memorized a set of disconnected answers to specific prompts — which is exactly the distinction this style of question is designed to surface.

A Numerical Variation to Practice

To confirm the four-step framework is genuinely understood rather than memorized against a single $100-at-5%-and-25% example, try running it against a $600 loan at a 6% (0.06) interest rate with a 21% (0.21) tax rate. Step 1: state the two-part structure. Step 2: on Day 0, Cash rises by $600 and Debt rises by $600, with zero income statement impact. Step 3: annual Interest Expense is $36 (6% of $600). Step 4: applying the 21% tax rate, the after-tax hit to Net Income, Cash Flow from Operations, and Retained Earnings is $28.44 ($36 × 0.79) rather than the full pre-tax $36. Running the same four steps against a completely different loan size, rate, and tax rate — rather than only ever reciting the original numbers — is what separates a candidate who understands the mechanic from one who has memorized a single case's arithmetic.

How This Connects to Reading a Real Company's Debt Footnote

Beyond the interview room, this exact four-step logic is what allows an analyst to read a company's debt footnote in a 10-K and understand what's actually happening: a new debt issuance shows up in the financing section of the cash flow statement with no income statement impact in the period it's issued, while the interest expense on that debt accrues quietly on the income statement every subsequent period, reduced by the tax shield exactly as in this framework. Recognizing this pattern — rather than only being able to reproduce it for a hypothetical $100 example — is what separates interview preparation that builds durable, transferable skill from preparation that only optimizes for passing this specific question. It's also directly useful when working through Connect the Three Statements, where multiple simultaneous changes, including financing activity like this one, need to be tracked at once.

How to Recover If You State a Step Out of Order

Even candidates who know this framework well sometimes jump ahead under pressure — for instance, quoting the after-tax interest impact before ever mentioning the Day 0 balance sheet mechanics. The strongest recovery is to catch it yourself, out loud, rather than pushing forward inconsistently: something like "actually, let me back up and cover Day 0 first, since that's a separate part of the answer." Interviewers are generally more interested in whether a candidate can self-organize and correct course cleanly than in whether the steps came out in perfect order on the first attempt, since real modeling work always involves catching and fixing small structural slips along the way. Treating a self-caught reordering as a normal part of a confident answer, rather than a disqualifying stumble, is itself part of genuine interview readiness.

What Changes If the Loan Amortizes Instead of Being Interest-Only

The four-step framework above assumes an interest-only loan, where the full $100 of principal stays outstanding until repayment — but interviewers sometimes vary the question by specifying an amortizing loan, where a portion of principal is paid down each period alongside interest.

Separating Interest From Principal

The key distinction to state clearly: the interest portion of each payment still flows through the income statement exactly as described in Step 3 and Step 4, but the principal portion is a pure balance sheet event — Cash falls, Debt falls, by the same amount, with zero income statement impact, just like the original loan issuance in reverse. A candidate who conflates the two components, treating the entire loan payment as if it reduces Net Income, is making the same category error as one who thinks the original $100 loan issuance itself hit the income statement. Explicitly separating interest from principal in an amortization scenario is a natural and common extension of this question, and being ready for it is part of full preparation for this topic.

The Takeaway

The four-step structure in this article — separate the transaction from its cost, walk Day 0, layer in interest, apply the tax shield — is a template, not a script tied to this one $100 loan example. Practicing it against a handful of different loan sizes, interest rates, and tax rates, rather than memorizing the original numbers verbatim, is what makes a candidate resilient to however the interviewer happens to phrase the question, and it's the same discipline worth applying to every other "3-statement change" prompt covered on this site.