Why must total sources equal total uses in an LBO, and is this an accounting identity or a real economic constraint? Explain the difference.

How this comes up in interviews

What the interviewer is actually testing

Sources & uses is deceptively "simple" - it's mostly addition - which is exactly why interviewers use it to test whether a candidate actually understands deal mechanics or is just repeating vocabulary. The real tests are:

Can you name every line on both sides without prompting, in the right order of seniority on the sources side (revolver/TLA/TLB before high yield before equity), and can you explain why each use exists (not just refinancing debt, but explaining why existing debt gets refinanced at all - change of control provisions, capital structure control).
Can you compute the plug. Given a purchase price, fees, and a specified debt stack, can you solve for the sponsor equity check quickly and correctly? This is a standard modeling-test warmup and a common live "build this on a whiteboard" prompt.
Do you understand what "cash-free, debt-free" means and why it matters for the uses side - it signals you understand that the headline purchase price and the actual cash the buyer needs to raise externally are two different numbers once existing cash and debt are netted.
Can you connect the schedule to leverage and returns - a strong candidate volunteers that the resulting debt/EBITDA ratio (from the sources side) and the equity check size (which sets the return denominator) are the two most consequential numbers this schedule produces, not just a bookkeeping exercise.
Do you know management rollover reduces the sponsor's check and can explain why a sponsor wants that (alignment, signal, and literally less capital needed) - this is a common bridge question into Lesson 35's territory.

Weak candidates can list "debt and equity" as the two sources but cannot build the actual schedule with fees, refinancing, and a specific debt stack under time pressure - which is precisely what elite-boutique and PE-adjacent interviews demand.

Common mistakes

Common traps

Trap 1: Forgetting transaction and financing fees as a use of funds. Building a sources & uses that only includes the purchase price and the debt refinancing, missing 1.5-3.0% of debt raised in financing fees plus M&A advisory and legal fees.

Say it out loud: "Fees are a real cash use at close - financing fees typically run 1.5-3.0% of the debt raised, plus M&A advisory and legal fees - and forgetting them understates the actual cash the deal needs to raise, which understates the equity check."

Trap 2: Treating the equity check as a free plug rather than an iterative sizing decision. Saying "equity just plugs the gap" without acknowledging that in practice the debt stack is sized to what lenders will provide and the sponsor's return targets, not purely residually.

Say it out loud: "Mechanically, equity is the plug that makes sources equal uses, but in a real deal the debt tranches are sized first based on what the credit markets will support and what leverage the business can service, and the resulting equity check then has to clear the sponsor's return hurdle - if it doesn't, the sponsor either walks or renegotiates price."

Trap 3: Not netting existing cash and debt correctly in a cash-free, debt-free deal. Double-counting or omitting the target's existing cash and debt when the deal is structured cash-free, debt-free (the common convention).

Say it out loud: "In a cash-free, debt-free deal, the buyer pays for the enterprise on a cash-free, debt-free basis - meaning existing cash is kept by the seller (or swept as a source) and existing debt is repaid at close as a use - so the equity purchase price the buyer actually funds is the enterprise value minus existing net debt, not the sticker EV."

Trap 4: Misordering the debt stack on the sources side. Listing high yield notes before the term loan, or not understanding that seniority order matters for both the schedule's presentation and, more importantly, for what happens in a downside scenario.

Say it out loud: "I'd order the sources from most senior and cheapest to most junior and most expensive - revolver, then term loan A or B, then senior notes or high yield, then equity - because that seniority ordering is exactly the order in which claims get paid in a liquidation or restructuring."

Trap 5: Forgetting management rollover reduces the sponsor's required equity check. Treating 100% of the equity purchase price as the sponsor's own cash need.

Say it out loud: "If management rolls over a stake instead of cashing out, that rollover equity is still a source of funds - it just isn't new cash the sponsor has to write a check for, so the sponsor's own required equity is reduced dollar-for-dollar."

Trap 6: Confusing enterprise value and equity purchase price on the uses side. Using EV as the literal cash the buyer must fund without netting existing net debt, effectively double-paying for the target's existing debt (once via the EV multiple, again by separately refinancing it).

Say it out loud: "Enterprise value is what's being bought, but the actual cash the buyer needs to fund at close is the equity purchase price - EV minus existing net debt - plus separately refinancing that existing debt as its own use of funds; I wouldn't fund the full EV as if it were the equity check."

Also asked as

List every standard line item on the uses side and the sources side of an LBO sources & uses schedule, in the order you would present them.
What does 'cash-free, debt-free' mean, and why do most LBOs use this convention when structuring the purchase price?
Why does management rollover equity reduce the sponsor's required cash equity check, and why do sponsors generally want management to roll over a stake?
Purchase price is $350mm enterprise value with existing net debt of $40mm (cash-free, debt-free). New debt is a $150mm term loan and $70mm of high yield notes. Financing fees are 2% of new debt, other fees are $9mm. Compute the required sponsor equity check.
Explain the difference between the face value of a debt tranche and the actual net cash proceeds it generates when issued at an original issue discount (OID), and why this distinction matters for building an accurate sources & uses schedule.
Why is the revolver typically shown in the sources & uses schedule as available but undrawn at close, and what would it mean, from a risk perspective, if a deal required a fully drawn revolver on day one?
Enterprise value is $900mm with existing net debt of $70mm. New debt: a $70mm revolver (undrawn), a $320mm term loan B issued at 97 OID, and $220mm of senior notes at par. Financing fees are 2.25% of new debt face value (excluding the undrawn revolver), legal/advisory fees are $22mm, and management rolls $50mm. Compute the required sponsor equity check, being explicit about how you treat OID and the undrawn revolver.
Using the deal in the prior question, the lead arranger later tells you the term loan B market will only clear $280mm face value at the same 97 OID. Recompute the sponsor's equity check assuming the sponsor absorbs the entire cash shortfall itself, and state the percentage increase in the sponsor's required equity.
A target has $45mm of cash, of which $18mm sits in a foreign subsidiary and cannot be repatriated without a 25% tax cost. Enterprise value is $600mm and existing debt is $90mm. Compute the equity purchase price two ways: (a) naively crediting the buyer for all $45mm of cash, and (b) correctly crediting only the freely available cash plus the after-tax value of the trapped cash. Quantify the difference in the required equity check.

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