Quality of Earnings in PE Diligence: What It Is and Why It Matters

Quality of Earnings (QoE) is the diligence workstream that separates reported EBITDA from real, recurring EBITDA — and it's behind virtually every purchase price negotiation in private equity. Since LBO pricing is EBITDA × Multiple, every dollar of inflated or non-recurring EBITDA directly overpays the purchase price by the multiple. A $2M unjustified add-back at an 8x multiple is $16M of overpayment. Interviewers test QoE because it connects accounting, deal pricing, and sponsor judgment in a way that pure LBO mechanics don't.

What a QoE report actually is

A QoE report is typically prepared by an accounting firm (Big 4 or specialized diligence provider) during confirmatory diligence, after the LOI is signed. It takes the target's reported EBITDA and produces an adjusted EBITDA by:

1. Removing non-recurring items that inflated reported earnings (one-time gains, legal settlements received, asset sale profits)
2. Adding back legitimate non-recurring costs that depressed reported earnings (restructuring, one-time litigation, transaction costs)
3. Scrutinizing management's own add-backs for legitimacy and sustainability
4. Normalizing run-rate adjustments for recent changes (new contracts, lost customers, price increases, cost cuts)

The output is a bridge from reported EBITDA to "QoE-adjusted EBITDA" — the number the sponsor uses to finalize purchase price.

The EBITDA bridge

Every QoE report follows the same structure:

Reported EBITDA (per financial statements):     $50.0M
+ Legitimate add-backs:
    Restructuring costs (one-time):              $3.0M
    Non-recurring legal fees:                    $1.5M
    Owner excess compensation:                   $2.0M
− Non-recurring gains removed:
    Asset sale gain:                            ($2.5M)
    Insurance recovery (one-time):              ($1.0M)
− Questionable management add-backs:
    "Synergies not yet realized":               ($4.0M)
    Capitalized expenses reversed:              ($1.5M)
= QoE-Adjusted EBITDA:                          $47.5M

The sponsor's purchase price is then negotiated off $47.5M, not $50.0M — a $2.5M reduction that, at 8x, saves $20M on the purchase price.

Common add-backs and how they're scrutinized

Usually accepted

| Add-Back | Why It's Legitimate | |----------|-------------------| | One-time restructuring | Non-recurring by definition; won't repeat post-close | | Transaction costs | Deal-related, not operating | | Owner excess comp | Owner paying themselves above market; normalize to market salary | | Non-recurring legal | Litigation, regulatory — one-time events | | Start-up losses (recent acquisition) | New business line not yet profitable; will ramp |

Usually rejected or haircut

| Add-Back | Why It's Questioned | |----------|-------------------| | "Run-rate synergies" | Not yet achieved; speculative | | Capitalized expenses | May indicate aggressive accounting | | Related-party transactions | May not be arm's-length pricing | | COVID-era temporary costs | Must prove they're truly non-recurring | | "Normalized" revenue from lost contracts | Can't add back revenue that won't recur |

The negotiation

QoE findings become purchase price negotiation leverage:

• Seller's view: reported EBITDA + all management add-backs = $55M → 8x = $440M
• Buyer's view: QoE-adjusted EBITDA = $47.5M → 8x = $380M
• Gap: $60M — resolved through price reduction, earnout, or escrow

Earnouts and escrows are common resolution mechanisms when reported vs. adjusted EBITDA diverge significantly: the seller gets paid more if the business performs, but the buyer isn't paying upfront for EBITDA that may not materialize.

Why QoE matters for the LBO model

QoE directly affects three model inputs:

1. Purchase price (entry EBITDA)

Entry EV = QoE-Adjusted EBITDA × Entry Multiple

Using reported EBITDA instead of QoE-adjusted overstates the purchase price and depresses returns. Every PE associate learns to wait for the QoE before finalizing the model — the LOI model uses management's numbers; the IC model uses QoE-adjusted numbers.

2. Debt sizing (leverage ratio)

Lenders size debt off QoE-adjusted EBITDA, not reported:

Max Debt = QoE-Adjusted EBITDA × Max Leverage Multiple (e.g., 5.0x)

If reported EBITDA is $50M but QoE-adjusted is $47.5M, the lender's max debt is $237.5M, not $250M — a $12.5M difference in financing capacity.

3. Base case projections

QoE findings inform the operating model's starting point:

• If QoE removes a one-time cost add-back, the base case shouldn't assume that cost disappears permanently
• If QoE identifies a lost customer, revenue projections must reflect the churn
• If QoE normalizes owner comp, the post-close management cost structure changes

Red flags QoE uncovers

Experienced sponsors watch for these patterns:

Revenue quality issues:

• Channel stuffing (accelerating shipments to inflate current-period revenue)
• Bill-and-hold arrangements (revenue recognized before delivery)
• Related-party revenue at above-market prices
• Customer concentration (top customer is 30%+ of revenue)

Expense manipulation:

• Capitalizing operating expenses (repairs, maintenance) to inflate EBITDA
• Under-accrued liabilities (warranty reserves, litigation, environmental)
• Deferred maintenance that will require post-close capex

Working capital issues:

• Unusually low receivables (accelerated collections that won't repeat)
• Stretching payables (deferred vendor payments inflating current cash flow)
• Inventory build-up (overproduction inflating margins temporarily)

Each of these affects not just entry EBITDA but the projected cash flow the LBO model depends on for debt paydown.

Common interview questions

"What is a QoE report?" An accounting diligence report that normalizes reported EBITDA into recurring, defensible EBITDA by scrutinizing add-backs, removing non-recurring items, and adjusting for run-rate changes. The output drives final purchase price.

"Why does QoE matter if you're buying at a multiple?" Because Purchase Price = EBITDA × Multiple. Every dollar of inflated EBITDA is multiplied by the entry multiple — a $1M bad add-back at 8x is $8M of overpayment. QoE protects the sponsor from paying for earnings that won't recur.

"What's the difference between QoE and a full diligence process?" QoE is one workstream (financial/accounting diligence). It sits alongside legal diligence, commercial diligence (market, customers, competition), tax diligence, and operational diligence. QoE specifically addresses "are the earnings real?" — not "is the market attractive?" or "are there legal liabilities?"

"How do you handle a large gap between reported and QoE-adjusted EBITDA?" Renegotiate price, structure an earnout (seller gets paid if EBITDA materializes), or escrow a portion of the purchase price. Walking away is also an option if the gap is too large to bridge.

"What add-backs would you accept vs. reject?" Accept: one-time restructuring, transaction costs, excess owner comp, non-recurring legal. Reject or haircut: unrealized synergies, capitalized opex, related-party adjustments, revenue from lost contracts. Always tie acceptance to whether the item is truly non-recurring and verifiable.

The sponsor's QoE mindset

The interview answer that impresses:

"QoE is how I protect the entry multiple. I underwrite off QoE-adjusted EBITDA, not management's numbers. Every add-back gets scrutinized — if I can't explain why it's non-recurring and verify it independently, it doesn't go in my model. The purchase price, debt sizing, and base case projections all flow from that adjusted number."

This connects QoE to the three things that matter in an LBO: what you pay, how much debt you can raise, and whether the cash flow supports the returns you need. That's exactly what interviewers are testing.