Working Capital Adjustments in M&A: How They Work and Where Sellers Lose Money at Closing
Working capital adjustments are the single most common source of post-closing dispute in middle-market M&A. They look mechanical on the page. They are not. The provision is a price-adjustment formula that runs after closing, and the way it is drafted, modeled, and negotiated decides whether the seller walks away with the headline number or with several percentage points less.
Most sellers see the working capital section for the first time in a draft purchase agreement, agree to "ordinary course" and "consistent with past practice," and assume the math will land somewhere reasonable. It rarely does. The buyer's accountants set the target, draft the closing statement, and define what counts as a current asset. By the time the seller's CFO is reviewing the post-closing true-up, the numbers have already moved against the seller, often by amounts that exceed what the negotiating team thought the entire indemnity exposure would be.
This article walks through the mechanics of working capital adjustments in M&A, why they exist, where the negotiation pressure points are, and how sellers can avoid the traps that consistently cost real money at closing.
Topics covered:
Why Working Capital Even Gets Adjusted
Setting the Working Capital Target
Defining Working Capital: GAAP, Past Practice, and Where Disputes Are Born
Cash, Debt, and the Items That Move Between Categories
The Closing Statement Process and the Dispute Window
The Independent Accountant and What Actually Gets Litigated
Negotiation Points That Matter Most
Where Sellers Lose Money, and How to Stop It
Conclusion
1. Why Working Capital Even Gets Adjusted
The working capital adjustment exists because the purchase price is set months before the deal closes, but the assets and liabilities being delivered at closing are in motion the entire time. Receivables get collected. Inventory turns. Accruals build up. Vendors get paid. The buyer is paying for a going concern that includes a normal level of working capital to operate the business on day one. If the seller delivers less than that normal level, the buyer is effectively underfunding the business and needs a price reduction. If the seller delivers more, the buyer received a windfall and owes the seller the difference.
The mechanism is a true-up. The parties agree on a target level of working capital (the "peg" or "reference amount"), measure actual working capital at closing, and adjust the purchase price up or down by the difference.
Conceptually this is fair. In practice, every input to that formula is contested. The peg is contested. The definition of working capital is contested. The methodology used to calculate the closing balance sheet is contested. The dispute resolution process is contested. None of this is accident, and none of it is symmetrical.
2. Setting the Working Capital Target
The peg is the most consequential number in the entire adjustment provision, and it is the one most often set without enough rigor.
The standard approach is to use a trailing twelve-month average of monthly working capital balances. The logic is that the business has a "normal" level of working capital that fluctuates seasonally, and the average over a full year smooths out those fluctuations and produces a fair benchmark.
The execution is where it goes wrong. Sellers often agree to a TTM average without modeling whether the result actually reflects the business as it operates today. Working capital can be inflated by a one-time inventory build, a temporary receivables backlog, or a payables stretch that the seller has since corrected. It can be depressed by a seasonal trough that fell inside the measurement window. Either way, the number that ends up in the agreement is a historical artifact, not a forward-looking estimate of what the buyer needs to run the business.
Practical points for sellers:
Model the peg before you agree to the methodology. Run the calculation twelve different ways and understand the range. If the methodology is sensitive to small changes in measurement period or cutoff convention, that sensitivity is going to come back at you in the closing statement.
Do not let the buyer's quality of earnings team set the peg unilaterally. The QofE report is not a neutral document. It is prepared for the buyer and the assumptions in it favor the buyer. Have your own accountants review and rebut.
If the business has structural changes coming (a working capital normalization, a vendor terms renegotiation, a customer mix shift), address them in the peg explicitly. Do not assume the buyer will adjust for them post-closing in your favor.
3. Defining Working Capital: GAAP, Past Practice, and Where Disputes Are Born
The definition of working capital is usually written as "current assets minus current liabilities, calculated in accordance with GAAP applied consistently with past practice." Those words are a battlefield.
GAAP is not a single answer. It is a framework that tolerates a range of accounting treatments, and within that range, two competent accountants can produce materially different numbers. "Consistent with past practice" is supposed to constrain the GAAP range to whatever the seller has actually done, but past practice is itself often inconsistent or undocumented.
The disputes typically cluster in four areas:
Reserves and accruals. Did the seller historically accrue for warranty claims, customer rebates, sales returns, or bonuses? At what level? The buyer will argue that historical reserve levels were inadequate and that GAAP requires higher reserves at closing. Higher reserves mean lower working capital, which means a price reduction.
Inventory. How is inventory valued? FIFO, weighted average, or specific identification? How are obsolete or slow-moving items reserved? Is the reserve a fixed percentage or a tiered analysis? Inventory adjustments are a frequent source of disputes because the buyer's auditors apply more conservative reserve methodologies than the seller did.
Receivables. What constitutes a collectible receivable? Receivables aged beyond a certain threshold are often reserved or excluded, but the threshold is contested. Buyers tend to push for tighter aging cutoffs and higher reserves.
Cutoff. The closing date is rarely the end of an accounting period. Cutoff conventions ("revenue is recognized when shipped" versus "when invoiced" versus "when delivered") affect what falls inside the closing balance sheet versus what falls outside.
Practical points for sellers:
Negotiate the order of priority. The standard formulation is "GAAP, applied consistently with past practice." Make it "consistent with past practice, in accordance with GAAP." This puts past practice first, which favors the seller because the seller's historical methodology becomes the baseline.
Attach an illustrative calculation as a schedule to the purchase agreement. Show exactly how each line item is computed. This is the single most effective way to constrain post-closing argument. If the buyer wants to deviate from the schedule, they have to point to a specific GAAP requirement that overrides it.
List the specific accounting policies that govern each material line item. Inventory valuation method, receivables reserve methodology, and accrual practices for warranty, rebates, and bonuses should all be specified.
4. Cash, Debt, and the Items That Move Between Categories
Most modern purchase agreements use a "cash-free, debt-free" structure, meaning the seller keeps the cash and pays off the debt at closing, and the working capital adjustment runs separately from those items. This avoids double-counting and is the market standard in middle-market deals.
The complication is that several balance sheet items can plausibly be classified as either debt, working capital, or neither, and where they land directly affects the price.
Items that frequently get fought over:
Customer deposits and deferred revenue. Cash collected from customers for goods or services not yet delivered. The seller wants this treated as a current liability inside working capital (which means it offsets current assets and reduces the peg, but does not reduce the headline price separately). The buyer wants it treated as debt (which is paid out of the purchase price separately).
Accrued bonuses and management compensation. Accrued at closing for the period through closing. Are these "ordinary course" liabilities inside working capital, or are they "transaction-related" liabilities that the seller funds separately?
Tax accruals. Income tax payable through closing. Usually carved out of working capital and addressed in a separate tax indemnity.
Capital leases and operating lease liabilities. Post-ASC 842, operating leases sit on the balance sheet, but they are almost always excluded from both working capital and debt. Capital leases (now finance leases) are typically debt.
Unbilled receivables and contract assets. For percentage-of-completion or subscription businesses, where revenue is recognized but not yet invoiced. Always inside working capital, but the valuation methodology can produce wide swings.
Practical points for sellers:
Define every meaningful balance sheet line item and place it in one bucket. The agreement should have a closed list of working capital items, a closed list of indebtedness items, and an explicit "everything else is excluded" provision.
Watch for asymmetric definitions. Buyers sometimes draft the indebtedness definition broadly enough to capture items that are also inside working capital, which results in double-counting. Cross-reference and exclude.
Address transaction-related liabilities (advisor fees, change-of-control payments, retention bonuses tied to closing) separately and explicitly. These are not working capital and they are not ordinary debt. They are seller obligations that should be paid out of purchase price proceeds at closing, with no double-count.
5. The Closing Statement Process and the Dispute Window
The mechanics typically run as follows. The seller delivers an estimated closing statement a few days before closing, and the purchase price is funded based on that estimate. After closing, the buyer prepares a final closing statement, usually within 60 to 90 days. The seller then has a review period (commonly 30 to 60 days) to object. If the parties agree, the price is trued up. If they disagree on items totaling more than a defined threshold, the disputed items go to an independent accountant for binding resolution.
This process is asymmetrical and the asymmetry favors the buyer. The buyer controls the books after closing. The buyer prepares the closing statement using the buyer's accounting team and the buyer's interpretation of the agreement. The seller is reviewing a closing statement prepared by people who work for the counterparty, with limited access to the underlying records, on a tight timeline.
Practical points for sellers:
Negotiate access rights aggressively. The seller's review of the closing statement is meaningless without access to the workpapers, the underlying ledgers, and the personnel who prepared it. Spell out the access rights in the agreement. "Reasonable access" is not enough.
Negotiate the dispute threshold and the timing. A 30-day review period is short. 45 to 60 days is more workable, especially if the closing balance sheet is complex.
Specify what happens to undisputed items. The buyer should be required to pay (or the seller should be required to receive) any portion of the adjustment that is not in dispute, immediately. Otherwise, the buyer can hold up the entire adjustment by disputing one item.
6. The Independent Accountant and What Actually Gets Litigated
When the parties cannot agree, disputed items go to an independent accounting firm acting as expert (not arbitrator). The independent accountant's role is to apply the agreement to the disputed items and produce a binding determination.
The scope of what the independent accountant decides is one of the most important and least understood provisions in the working capital section.
The market standard is that the independent accountant resolves only matters of accounting application, not matters of contract interpretation. If the dispute is "what does the agreement require?" the answer comes from a court (or arbitrator) under the dispute resolution clause. If the dispute is "given the agreement, how should this line item be calculated?" the answer comes from the independent accountant.
This bifurcation matters because contract interpretation disputes can be very large and very slow. If the agreement is ambiguous about how a class of items is treated, the seller may face a multi-year process to resolve it before any working capital adjustment is finalized.
Practical points for sellers:
Eliminate ambiguity at the drafting stage. Every defined term that affects the working capital calculation should be unambiguous. Every methodology should be specified. The illustrative schedule helps enormously here.
Specify that the independent accountant's determination is limited to "matters in dispute" and that the determination cannot be greater than the high end or less than the low end of the parties' respective positions on each item. This "baseball-style" arbitration prevents the independent accountant from picking a number outside the range and removes the incentive to take extreme positions.
Address the cost-allocation provision. Costs of the independent accountant are typically allocated based on the success of each side. The most common formulation is to allocate costs proportionally to the disputed amounts in favor of each party. This discourages frivolous disputes.
7. Negotiation Points That Matter Most
If a seller has finite negotiating capital to spend on the working capital provision, here is where to spend it, in priority order.
The peg. Every other provision is downstream of this number. Get it right.
The definition of working capital, with an illustrative schedule. This is where ambiguity costs you. Close it down.
The order of priority between past practice and GAAP. Past practice first.
The cash-free, debt-free crosswalk. Make sure no item is double-counted between working capital and indebtedness. Define each bucket exclusively.
Access rights during the buyer's preparation of the closing statement. Without access, the seller cannot meaningfully challenge the buyer's numbers.
The dispute threshold and review period. Long enough to do real work, with full documentation.
The independent accountant's mandate. Limited scope, baseball-style, and clear cost allocation.
Working capital adjustments are not where deals die. They are where money changes hands quietly after the deal closes, and the rules that govern the exchange were drafted weeks or months earlier when nobody was paying close attention.
8. Where Sellers Lose Money, and How to Stop It
A few patterns appear over and over in real disputes.
The first is the unmodeled peg. The seller agrees to a TTM-average peg, the closing date falls in a low working capital month, and the seller owes a multi-million-dollar adjustment back to the buyer that nobody had projected. The fix is to model the peg against actual seasonality and to consider a fixed reference amount tied to a specific date if the trailing twelve-month average produces results that swing more than the seller can tolerate.
The second is the post-closing reserve build-up. The buyer takes over the company, applies its own reserve methodology to receivables, inventory, and warranty, produces a closing balance sheet with materially higher reserves than the seller had, and claims a corresponding adjustment. The fix is to specify the reserve methodologies in the agreement at line-item level and to include the illustrative schedule.
The third is the boundary fight. An item that should clearly be inside working capital, or clearly excluded, gets reclassified by the buyer in the closing statement to produce a price adjustment. The fix is to define every meaningful line item and to include an explicit "items not listed are excluded" provision so that the buyer cannot import new items into the calculation.
The fourth is the sandbagging cutoff. The buyer prepares a closing statement that uses a different cutoff convention than the seller's historical practice, particularly around revenue recognition or inventory receipts. The result is that revenue recognized just before closing is moved to the post-closing period, depressing the closing working capital number. The fix is to specify the cutoff convention explicitly and to require that the closing balance sheet be prepared "in the same manner and using the same cutoffs as the latest audited balance sheet."
The fifth is the missing access. The seller objects to the closing statement, requests access to the workpapers, and gets a curated subset that does not allow real diligence. The 60-day review window runs out and the seller is forced to file an objection that lacks the foundation to win at the independent accountant. The fix is contractual, and it has to be set up at signing. Spell out the access rights at the document, ledger, and personnel level. Tie the running of the review period to the date access is provided in full.
Conclusion
The working capital adjustment provision is not where most negotiating teams put their best people. It should be. The provision is mechanical, but the dollars are real, and the rules that govern the dollars are set during a window of the negotiation when the principals are focused on price, structure, and the rep package, not on the appendix that sets out the closing statement methodology.
The fix is preparation. Model the peg before you agree to it. Define working capital with a closed list and an illustrative schedule. Set the cash-debt crosswalk so nothing double-counts. Negotiate access rights, dispute thresholds, and the independent accountant's mandate as if they will be invoked, because they often are. And if you are a seller, recognize that the buyer's quality of earnings team is not a neutral source of truth. Have your own people on the math, before the agreement is signed and again before the closing statement is finalized.
For advice on negotiating working capital adjustments, the broader purchase price mechanics, or any aspect of your purchase agreement, contact us. Learn more about our Mergers & Acquisitions practice here.
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