Net Working Capital Adjustments: The Deal Term That Quietly Moves Millions and how to win it

A net working capital adjustment is the mechanism that trues up the purchase price after a deal closes so the buyer receives the business with a normal level of working capital, the cash tied up in receivables and inventory net of payables that the company needs to keep running. You agree a target before close, the peg. You measure the actual working capital delivered at completion. If the business comes in below the peg, the buyer pays less or claws money back. If it comes in above, the seller gets more. Dollar for dollar.

It reads like plumbing. It is not. This single clause routinely shifts more value at completion than any other term most founders never think about, and it now appears in nearly every private deal. SRS Acquiom's 2025 study of more than 1,200 private-target acquisitions found post-closing purchase price adjustments on the overwhelming majority of them. Get the peg, the definitions, and the cut-offs right and you protect the price you negotiated. Get them wrong, or walk in with messy books, and you hand money to the other side without ever sitting back down at the table. This guide is for founders, sponsors, and lenders who want to understand exactly where that money moves, and how to keep it on your side.

What a Net Working Capital Adjustment Actually Is (and Why It Moves Millions)

Most private deals are priced on a cash-free, debt-free basis. The buyer assumes the business arrives with no surplus cash and no borrowings, plus enough working capital to operate normally on day one. The problem is timing. Price gets agreed weeks or months before the deal actually closes, and working capital moves every single day as invoices go out, customers pay, stock turns, and suppliers get settled. The adjustment exists to bridge that gap, so the buyer is neither starved of working capital nor forced to inject cash on day two to make payroll.

The reason it moves millions is leverage in the literal sense. A small percentage of enterprise value, applied to a large number, is real money. In SRS Acquiom's data the median escrow set aside specifically for the purchase price adjustment ran at about 1% of transaction value, and the average buyer claim came in around 0.9% of the deal price. On a $50 million deal that is roughly $450,000 changing hands on a clause that never makes the headline terms. The adjustment is not a rounding error. It is a second, quieter negotiation that happens after the handshake.

Setting the Peg: How the Working Capital Target Gets Calculated

The peg, also called the working capital target or the normal level, is the number the business has to hit at close. Almost everyone builds it the same way: take a trailing average of monthly working capital, usually the last twelve months, normalize out anything one-off or distorting, and call the result the steady-state requirement of the business. A trailing average matters because it smooths seasonality. A landscaping company or a retailer with a Q4 spike would set a wildly unfair peg off a single month, so you average across the cycle to capture what the business genuinely needs to operate.

Three choices inside that calculation decide who wins, and they are negotiated, not given:

• What counts as working capital. The definition is bespoke to every deal. Cash is usually excluded (it is handled separately as part of the cash-free, debt-free mechanic), and so are debt-like items. Whether a given accrual, prepayment, or deferred revenue balance sits inside or outside the peg is worth real money and is fought over line by line.
• The averaging period. Twelve months is common, but a business that is growing fast will carry more working capital today than its trailing average suggests, which favors the seller pushing for a shorter or more recent window. A declining business is the mirror image.
• The accounting policies. The peg and the closing statement must be prepared on a consistent basis. If the target is built on one set of policies and the close is measured on another, the comparison is rigged. This is where vague drafting ("in accordance with GAAP, consistently applied") quietly becomes a dispute.

The True-Up Mechanic: From Estimated Close to Final Settlement

The adjustment runs in two stages, and understanding the sequence tells you where the power sits. At close, the seller delivers an estimated closing statement, and the price is adjusted up or down against the peg using that estimate. Then, typically 60 to 90 days after completion, the buyer prepares the final closing statement using actual figures once the books have settled. The difference between estimate and final is the true-up, settled in cash or out of the dedicated escrow.

Here is the part sellers underestimate: the buyer holds the pen on the final number. They own the business, they own the records, and they prepare the binding closing statement. SRS Acquiom found that buyers' proposed working capital calculations were reviewed and ultimately accepted in 7 out of 10 adjustments. The seller usually has a short window to object, after which the figure stands, and any dispute that cannot be resolved goes to an independent accountant whose decision is final. If you are selling, the implication is blunt. Whoever brings the better-documented numbers wins, and after close that is rarely the seller unless they prepared in advance.

The reassuring news is that most of this resolves quietly. Even contested claims took a median of under two months to settle, and the dedicated escrow means the cash is already ring-fenced. Buyers are leaning into that protection: in the American Bar Association's 2025 Private Target Deal Points Study, 58% of deals now require a separate escrow specifically for the adjustment rather than relying on the general indemnity pot or a bare promise to pay. The mechanism is maturing, which means the sloppy participant has fewer places to hide.

Locked Box vs Completion Accounts: The US/UK Divide

There are two ways to handle the timing problem, and which one you meet depends heavily on where the deal is done. Everything above describes completion accounts: you measure working capital after close and true up. The alternative is the locked box, where the parties fix the price off a historical, audited balance sheet at a set locked-box date before signing. From that date the economic risk and reward pass to the buyer, value cannot leak out to the seller except through agreed permitted leakage, and there is no post-close true-up at all. The price is the price.

The geographic split is stark. The US runs almost entirely on completion accounts: Latham & Watkins reported that 94% of US private-target acquisitions used post-closing purchase price adjustments. Continental Europe leans the other way, with the locked box featured in 49% of private deals and completion accounts in only around a quarter. The UK sits between the two extremes, more balanced than either: locked-box mechanisms appeared in 37% of UK sales and completion accounts in 29%. If you are doing a transatlantic deal, this is one of the first norms that will surprise the other side.

Neither approach is better in the abstract; they trade certainty for accuracy. The locked box gives price certainty at signing and a cleaner close, which sellers and auction processes love, but it demands a reliable, recent balance sheet you are willing to be held to. Completion accounts get closer to the true position on the day but keep the price open for months and invite exactly the disputes described above. Locked-box deals increasingly carry a ticking fee, interest accruing to the seller between the locked-box date and completion to compensate for the value building up in the business, which Latham notes now features in a majority of locked-box deals, alongside warranty and indemnity insurance on about half of all deals in its study. One thing the choice turns on is rarely spelled out: the mechanism you can credibly run is a direct function of how good your books are. Clean, reconciled, recent accounts let you offer a locked box and take the post-close true-up off the table; slow or stale books leave you with completion accounts and a buyer holding the pen.

Where the Money Quietly Moves: Adjustment Sizes and Disputes

The adjustment is now routine, not exotic. SRS Acquiom's team alone has resolved more than 2,600 purchase price adjustments, and its 2025 study covered finalized adjustments across deals worth more than $298 billion. The American Bar Association's 2025 study, the recognized benchmark for US private-company terms, found 90% of middle-market deals included a post-closing adjustment, down only marginally from 92% in the prior cycle, across 139 agreements priced between $25 million and $900 million. Whatever your deal size, this clause is in the room.

The averages hide a heavy tail, and the tail is where it hurts. Average buyer claims ran around 0.9% of transaction value, but about a quarter of all claims exceeded 1% of the deal price. On a larger transaction that is a seven-figure swing decided months after you thought the deal was done. The European picture echoes the same direction of travel: the CMS European M&A Study 2025, drawn from 582 deals across 27 jurisdictions, reported buyers pressing for greater use of purchase price adjustments and earn-outs, pushing more of the price into conditional, post-close territory. The adjustment is not going away. It is spreading.

Disputes cluster in predictable places: an accrual that one side booked and the other ignored, a receivable the buyer deems uncollectible, inventory written down post-close, a cut-off that slid revenue or cost across the completion date, or a policy applied inconsistently between the peg and the closing statement. Every one of these is an accounting argument, and accounting arguments are won with documentation, not assertion.

How a Weak Finance Function Loses Money on the Peg

This is where the adjustment stops being a deal-team problem and becomes a finance problem you created long before the LOI. A weak finance function bleeds cash in the ordinary course, slow collections stretch receivables, no forecast means working capital lurches around unmanaged, poor margin visibility hides what is really tied up in the business. The same weaknesses then cost you a second time at the table. When the buyer prepares that final closing statement, every undocumented accrual, every soft cut-off, every estimate you cannot defend with a reconciliation becomes their adjustment to make, and they hold the pen.

Concrete examples of how the money walks out:

• Sloppy cut-offs. Revenue booked a few days early, or supplier costs booked a few days late, inflate the working capital you appear to deliver. A diligent buyer reverses it post-close and claws back the difference.
• Undocumented accruals and reserves. If you cannot show how a bad-debt provision, warranty reserve, or rebate accrual was calculated, the buyer restates it on their terms, and the burden of proof has already shifted to you.
• No working-capital model. Without a trailing-twelve-month view of normalized working capital, you cannot challenge the buyer's peg or their closing statement. You are negotiating blind against a counterparty who is not.
• A stale, slow close. If your month-end takes weeks and never quite ties out, you have forfeited the locked box (your cleanest option) and handed the completion-accounts process to the only party with reliable numbers: the buyer.

Building a Defensible Working Capital Position Before You Sell

You win the adjustment before the closing statement is ever drafted, by walking in with numbers no one can credibly challenge. That means a normalized working-capital model built on a clean trailing-twelve-month base, every accrual and reserve supported by a documented calculation, cut-off procedures tight enough to survive scrutiny, and a clear, defended view of your own peg before the buyer proposes theirs. It also means deciding early which mechanism your books can credibly support, because that choice is downstream of how good your finance function is. A buyer-ready data room is part of the same discipline; see our investor-ready data room checklist and the broader playbook in how to prepare your business for sale.

This is exactly the work OpsFi's deal support is built for: pressure-testing the peg, building the working-capital model that survives diligence, and standing behind your numbers when the buyer's closing statement lands. The same rigor that protects the working capital adjustment also protects the headline price, because a defensible balance sheet and a defensible earnings number are two halves of the same story; we cover the other half in closing the private-company valuation gap.

Key Takeaways

The net working capital adjustment is the most consequential deal term most sellers never plan for. It is in over 90% of private deals, it moves real money at completion, and the party with the better-documented numbers wins it, which after close is the buyer by default. The US trues up after close, Europe tends to lock the box, and the UK splits the difference. None of that changes the one thing within your control: the quality of your finance function. Clean books let you choose your mechanism, set a defensible peg, and hold your price. Weak books cost you twice. Decide which kind of seller you want to be long before the LOI arrives.