Your QoE Is Only Half the Diligence: The Cost-Structure Risks It Misses

If you're buying your first manufacturer or distributor, a Quality of Earnings report isn't optional — it's the important money you spend in diligence. It takes the seller's reported EBITDA apart, strips the add-backs that don't hold up, normalizes the one-time items, and hands you and your lender a number you can underwrite against.

But here's the thing nobody says out loud at the closing table: a QoE tells you the earnings were real (past tense). It doesn't tell you they'll last into the future.

Running Quality of Cost (QoC) Audits, the pattern is consistent — the earnings a QoE validated in the spring quietly stopped being true by the fall. Not because anyone cooked the books, but because the cost structure underneath those earnings shifted, and nothing in the diligence had looked at whether it could hold.

In manufacturing, the costs are the business

In a manufacturing or distribution business, cost of goods sold is usually 50–70% of revenue. That's not a footnote — it's the whole game. When COGS is that much of every dollar coming in, the earnings a QoE certifies are only as durable as the supply chain sitting underneath them. A two-point move in input cost could remove an entire deal's healthy margin.

A QoE reads that COGS line beautifully. It confirms what was paid, tests whether it was recorded correctly, and normalizes it. What it does not do — because it's not its job — is ask whether the arrangement that produced that cost survives the year after you close. That's a different question, and it's an operational one, not financial per se.

Five things a QoE doesn't check

Supplier continuity. Supplier concentration is only the starting point. A Quality of Costs audit identifies critical single- and sole-source components, evaluates contract and capacity protections, maps geographic and tariff exposure, and determines whether qualified alternatives exist. A low-cost component from one supplier can stop production of a high-margin product, while qualifying a substitute may take six months or longer. The real question is not simply how much the company spends with a supplier, but how much revenue and EBITDA depend on that supplier continuing to perform.

Inventory quality. A QoE can test whether inventory exists, is valued correctly, and carries an appropriate reserve; it generally does not determine whether the company is holding the right inventory. Manufacturers are often overstocked on slow-moving parts while remaining exposed to shortages of critical components. A Quality of Costs audit examines aging, turns, lead-time coverage, minimum-order quantities, safety-stock logic, stockouts, and purchasing discipline. This separates potential working-capital releases from inventory that is genuinely necessary to protect production and customer service.

Product and component continuity. A component may be available today but approaching end-of-life, sourced from a single factory, or dependent on tooling whose condition and location are poorly documented. Replacing it may require engineering work, testing, customer approval, or regulatory requalification—turning a seemingly minor purchasing issue into months of disruption. A Quality of Costs audit reviews critical bills of material, component lifecycle exposure, substitution difficulty, approved alternatives, and tooling control. It then connects those risks to the finished products, revenue, and margins they support.

Procurement maturity. Historical purchase prices can appear stable even when the processes behind them are weak. A Quality of Costs audit evaluates contract coverage, competitive bidding, pricing controls, supplier scorecards, delivery and quality metrics, ERP/MRP discipline, commodity management, and dependence on individual employees. It also tests whether management can measure purchase-price variance, enforce supplier commitments, and respond systematically when costs or lead times change. The objective is to determine whether the buyer is inheriting a repeatable procurement system or a collection of informal relationships and tribal knowledge.

EBITDA impact driven by future operations. Operational findings matter most when they are translated into financial exposure. A Quality of Costs audit estimates the potential EBITDA and cash-flow effects of supply interruptions, tariffs, commodity volatility, premium freight, obsolete inventory, redesigns, and supplier price resets. It distinguishes recurring earnings risk from one-time costs and working-capital opportunities while avoiding overlap between related findings. That gives the buyer and lender a practical downside case, along with specific mitigations that can become closing conditions or a post-close action plan.

Why this should matter to a lender

When a first-time buyer misses projections in year one, the operational reason is very often cost-structure risk that was never diligenced — a supplier that walked, an input that reset, a contract cliff nobody modeled. That underperformance lands on the borrower first and the lender right behind them. QoE became standard precisely because overstated EBITDA is, ultimately, the lender's loss. The same logic extends one step further down the income statement. The cost structure is where the earnings actually come from, and in these deals it's the least-examined part of the file.

What a Quality of Costs audit actually is

None of this is new invention. The supply-chain and cost-structure workstream we're describing is a recognized part of operational due diligence — the kind private-equity firms already run on larger deals. What almost never happens is that same discipline applied to acquisitions under about $20 million, where the diligence budget is thinner and the QoE is often the only outside eyes on the numbers. A Quality of Costs audit is that PE-grade cost-structure review, standardized and priced for the lower middle market and SBA-sized deals.

Bottom Line: A QoE validates that the earnings are real. A QoC audit validates that they survive the supply chain. If you're looking at a manufacturer and want to know whether the cost structure underneath the earnings holds, book a short scoping call and we'll tell you whether your deal fits our QoC Audit.