Working Capital Adjustment in Acquisitions: Calculating the Normalized Peg

The working capital adjustment is the mechanism that ensures the buyer receives a normal level of working capital at close. Working capital — current assets minus current liabilities, with specific inclusions and exclusions defined in the purchase agreement — is the operating fuel of the business. Without sufficient working capital, the buyer must inject cash post-close just to keep the business running. With excess working capital, the buyer received free cash flow that was already ‘baked into’ the deal. The adjustment squares this up by comparing actual working capital at close to a pre-agreed normalized level (the ‘peg’) and settling the difference.

The peg is calculated from historical operations, usually using a trailing twelve-month average. The 12-month trailing average is the most common methodology because it captures a full operating cycle, smooths seasonal variation, and reflects what working capital looks like in normal operations. Some deals use shorter averages (3-month or 6-month) when the business is growing rapidly or when recent operations differ materially from earlier periods. Some deals use point-in-time methodologies when seasonality is so pronounced that a simple average would mislead. The methodology is negotiated between buyer and seller, ideally before signing.

Seasonality requires explicit adjustments to the peg or to the closing balance. An HVAC business sells far more in summer than winter, which means accounts receivable balances are dramatically different in August than in February. A retailer builds inventory in the fall ahead of holiday selling and runs it down in January. A landscaper has near-zero AR in January and peak AR in July. If the peg is a 12-month average and close happens in a peak month, the buyer receives a working capital balance well above normal — and pays the seller for the excess. If close happens in a trough month, the buyer receives less than normal and is owed the shortfall. The peg methodology must address when close occurs.

The true-up is settled 60-90 days after close on a closing balance sheet. The buyer (or the buyer’s accountant) prepares a closing balance sheet, calculates actual working capital using the same methodology as the peg, and reconciles. If the seller agrees, the true-up settles via cash payment in either direction. If the seller disputes the buyer’s calculation, the disagreement goes to a dispute-resolution mechanism — typically a neutral third-party accounting firm acting as expert (not arbitrator). The mechanism is fast (30-60 days) but binding. Working capital disputes are common in lower-middle-market deals and the dollars at stake are often six- or seven-figure.

“The working capital peg is the most negotiated number in a deal that nobody talks about. Every dollar of difference between ‘normal’ working capital and the closing balance is a dollar that changes hands — and it’s settled months after close, when leverage is gone.”

Key Takeaways

• Working capital adjustment ensures the buyer receives a normal level of working capital at close, with a dollar-for-dollar settlement of any difference between the peg and actual.
• The 12-month trailing average is the most common methodology for calculating the peg because it captures a full operating cycle and smooths seasonality.
• Seasonal businesses (HVAC, landscaping, retail) require explicit seasonality adjustments to the peg or to the closing methodology.
• True-up happens 60-90 days after close on a closing balance sheet prepared by the buyer; the seller has dispute rights.
• Common pitfalls: inconsistent accounting policies, undefined inclusions and exclusions, ambiguous cut-off rules, and weak dispute mechanics.
• The Definitive Purchase Agreement should define the peg amount, the methodology, the inclusions/exclusions, the closing balance sheet rules, the true-up timeline, and the dispute mechanism — ideally with a worked example schedule.

What is the working capital adjustment in an acquisition?

The working capital adjustment is a dollar-for-dollar true-up between the actual working capital at close and a pre-agreed normalized level. When buyer and seller agree on a purchase price, they assume a certain level of working capital will be inside the business at close. If actual working capital is higher than the assumed level, the seller has effectively transferred extra value, and the buyer pays the difference. If actual working capital is lower, the seller has retained extra value (perhaps by delaying vendor payments or accelerating customer collections), and the seller pays the difference back.

Working capital is defined narrowly in the purchase agreement. ‘Working capital’ for purposes of the adjustment is not the entire balance sheet. It is a specific subset: typically accounts receivable, inventory, prepaid expenses, accounts payable, and accrued liabilities. Cash is usually excluded (the seller takes cash), debt is usually excluded (handled separately), and items like income taxes payable, deferred revenue, and customer deposits are negotiated case by case.

The agreed normalized level is called the peg. The peg is a single dollar amount written into the purchase agreement. It represents what working capital should look like in ‘normal’ operations. The peg is calculated using a methodology — usually a 12-month trailing average — applied to historical data, with adjustments for known one-time items, accounting changes, or seasonal timing.

The mechanic is essentially: actual minus peg equals adjustment. If actual working capital at close is $4.2M and the peg is $3.8M, the seller receives an additional $400K in proceeds. If actual is $3.5M and the peg is $3.8M, the seller pays the buyer $300K. The adjustment is settled in cash, usually 60-90 days after close, after a closing balance sheet has been prepared and reviewed.

Why the working capital adjustment exists

Without an adjustment, sellers could manipulate working capital to extract cash before close. A seller who knows the deal is going to close on a fixed date can try to convert working capital into cash: aggressively collect receivables, stretch payables, draw down inventory. Each move reduces working capital and increases cash — and the seller takes the cash. The buyer is left with a business short on operating fuel that needs an immediate cash injection.

The adjustment also protects sellers from bad-faith timing. A buyer could try to time close in a working-capital-trough month to inherit the maximum cash and minimum operating obligations. The adjustment prevents this in both directions: regardless of when close happens, the buyer receives the agreed normalized level of working capital, and the difference flows to the appropriate party.

The adjustment reflects the going-concern principle of the deal. The buyer is paying for a going concern — an operating business with the resources to continue running. Working capital is part of those resources. The deal value implicitly assumes the business arrives at close with normal levels of receivables to collect, inventory to sell, and payables to manage. The adjustment makes that assumption explicit and enforceable.

The adjustment is universal in lower-middle-market deals over $5M. Below $5M, simpler structures sometimes apply — a fixed working capital target, no true-up. Above $5M, almost every deal has a working capital adjustment with a true-up. The expectation is set in the LOI: ‘Purchase Price subject to adjustment for net working capital based on a target equal to the trailing 12-month average.’

Calculating the peg: the 12-month trailing average

The 12-month trailing average is the most common methodology for calculating the working capital peg. The methodology takes the working capital balance at the end of each of the last 12 months, sums them, and divides by 12. The result is the average working capital across a full operating cycle. The 12-month period captures all seasonality, all monthly variation, and all normal operating patterns. It smooths out individual months that may be high or low for non-recurring reasons.

The mechanics are straightforward but the inputs require care. Pull the balance sheet as of each month-end for the last 12 months. For each month, calculate working capital using the agreed definition (e.g., AR + Inventory + Prepaids – AP – Accrued Liabilities). Sum the 12 monthly figures. Divide by 12. The result is the peg. The agreed definition matters: the same line items must be used consistently across the 12 months and at close.

Why 12 months and not 6 or 3. Twelve months is long enough to capture a full seasonal cycle in nearly every business. Shorter averages risk biasing the peg toward whatever season the trailing period happens to cover. A 3-month trailing average ending in summer for an HVAC business would dramatically overstate normalized working capital; a 3-month trailing average ending in January for a retailer would dramatically understate it.

When shorter averages are used. Shorter averages (3-month or 6-month) are sometimes used when the business has changed materially in the last year — rapid growth, a new product line, a major customer addition or loss, or a recent acquisition. In these cases, the most recent months are more representative of go-forward operations than the full trailing year. Shorter averages must still address seasonality, often by selecting comparable seasonal months from prior years rather than the most recent calendar months.

Inclusions and exclusions: what counts as working capital

The purchase agreement must define exactly which line items are included in working capital. Standard inclusions: trade accounts receivable (sometimes net of allowance for doubtful accounts), inventory (raw materials, work-in-process, finished goods), prepaid expenses, trade accounts payable, and accrued liabilities. Standard exclusions: cash and cash equivalents (the seller takes cash), interest-bearing debt (handled in the cash-free, debt-free purchase price mechanic), tax assets and liabilities, intercompany balances, and related-party balances.

Negotiated items vary by deal. Deferred revenue: included or excluded? Customer deposits and advances: included or excluded? Income tax receivables and payables: included or excluded? Accrued bonuses and accrued vacation: included or excluded? Each item changes the peg and the closing balance materially. Consistent treatment between the peg calculation and the closing balance is essential — you cannot exclude an item from the peg and include it at close, or vice versa.

Disputes often arise around items that are not clearly defined. If the agreement says ‘working capital means current assets minus current liabilities’ without further definition, disputes are inevitable. Is a long-term receivable that becomes current within 12 months included? Is a customer deposit treated as deferred revenue or as a working capital liability? Is a one-time accrual for a regulatory matter included? Each ambiguity becomes a six-figure argument at the true-up.

The best protection is a worked example schedule attached to the purchase agreement. A schedule that shows the peg calculation line-by-line, with each included item identified, removes most ambiguity. The closing balance sheet is then prepared using the same line items, the same accounting policies, and the same calculation methodology. Disputes are limited to whether specific facts at close (e.g., the right amount of accrued bonus) match the schedule’s methodology.

Seasonality: the most common source of disputes

Seasonal businesses have working capital that swings dramatically through the year. An HVAC business in the southern US has peak AR in late summer (after a busy season of installations and service calls) and trough AR in late winter. The summer AR balance might be 2-3x the winter balance. If close happens in August, working capital is at peak. If close happens in February, working capital is at trough. The 12-month average sits somewhere in between.

The 12-month average usually solves the seasonality problem — for the peg. The peg, calculated as a 12-month trailing average, reflects the average working capital across a full cycle. It is a normalized figure. The issue is comparing the peg to the closing balance: actual working capital at close is a point-in-time figure that reflects whatever season close happens in. So the comparison is between an average and a point-in-time number.

Three approaches handle this. First, accept the mismatch and let the adjustment compensate the appropriate party (seller in peak months, buyer in trough months). Second, define a seasonal peg with month-specific targets (so a February closing uses a February-specific peg). Third, use a normalized closing balance methodology that adjusts the actual close-date balance to a normalized basis. Each approach has strengths and weaknesses.

The simplest approach is usually best: average peg, point-in-time closing balance. Both parties know going in that the adjustment will swing in one direction based on close timing. The seller targeting an off-peak close knows they may pay a working capital adjustment to the buyer. The buyer targeting a peak close knows they may pay extra. Pricing this into the broader deal economics is straightforward and the mechanic is clean.

Worked example: HVAC business with seasonal working capital

Consider an HVAC services business with a seasonal working capital pattern. The business has higher accounts receivable in summer (driven by installations and service calls) and lower in winter. Inventory is steady year-round. AP fluctuates with material purchases — higher in spring and summer. The trailing 12-month average working capital is $1.2M. The peg is set at $1.2M based on the average.

Scenario A: close in August. August working capital is $1.5M (above average due to peak AR). The actual exceeds the peg by $300K. The seller receives an additional $300K at the true-up. This compensates the seller for transferring a working capital balance higher than the agreed normalized level.

Scenario B: close in February. February working capital is $0.95M (below average due to trough AR). Actual is below the peg by $250K. The seller pays the buyer $250K at the true-up. This compensates the buyer for inheriting a working capital balance lower than the agreed normalized level.

Both scenarios illustrate the mechanic working as intended. The seller’s total proceeds — sale price plus cash on the balance sheet plus working capital adjustment — ends up roughly equivalent regardless of close timing. The buyer pays for a normalized business regardless of when the close happens to occur in the seasonal cycle. The adjustment is the equalizer that separates true value from seasonal accident.

The closing balance sheet and the post-close true-up

The true-up happens 60-90 days after close. The purchase agreement specifies a deadline for the buyer to deliver a closing balance sheet — commonly 60 to 90 days after close. The closing balance sheet is the actual balance sheet of the target as of the close date, prepared using the same accounting policies and the same line-item definitions as the peg. From it, the buyer calculates actual working capital and reconciles to the peg.

The seller has a review and dispute period. Once the closing balance sheet is delivered, the seller has a defined period to review it — typically 30 to 45 days. During the review period, the seller can request supporting documentation, ask questions, and propose adjustments. If the seller agrees with the buyer’s calculation, the true-up settles in cash. If the seller disputes specific items, those items go through the dispute-resolution mechanism.

Disputes go to a neutral third-party accounting firm. Most agreements specify a neutral accountant (often a Big Four or large regional firm) acting as expert. The neutral receives both parties’ positions, reviews supporting documentation, and renders a binding decision on the disputed items only. The non-disputed items are settled separately. The neutral’s decision is binding and not appealable except for fraud or manifest error.

Dispute timelines are typically 30 to 60 days from referral. The neutral works under the timeline specified in the agreement. The cost of the neutral is shared in various ways: 50/50, weighted by dispute outcome, or borne by the losing party. Materials submitted to the neutral are usually capped (e.g., a single position paper of defined length per side, plus underlying schedules and supporting documents).

Common pitfalls in working capital adjustments

Pitfall 1: inconsistent accounting policies. If the peg is calculated using cash-basis accounting and the closing balance is prepared using accrual-basis accounting, the comparison is meaningless. Both must use the same accounting framework. The agreement should specify: same policies, same recognition rules, same accruals methodology, applied consistently across the trailing period and at close.

Pitfall 2: undefined inclusions and exclusions. ‘Working capital means current assets minus current liabilities’ without further definition is a recipe for disputes. Every line item in current assets and current liabilities should be explicitly identified as included or excluded. A worked example schedule attached to the agreement is the gold standard.

Pitfall 3: ambiguous revenue and cost cut-offs. Was the August invoice for July services recognized in July (when the work was done) or August (when the invoice was sent)? The cut-off rule materially affects the AR balance at month-end. Both the trailing average and the closing balance must use the same cut-off rule, and the rule should be specified in the agreement.

Pitfall 4: weak dispute mechanics. If the dispute mechanism is silent on important details — who bears costs, how long the neutral has, what materials each side submits, what authority the neutral has — the dispute itself can become a sub-dispute. Specific, tested mechanics are essential. Reference an experienced M&A counsel for the dispute clause.

Pitfall 5: no escrow or holdback to fund seller-side adjustments. If the true-up runs in the buyer’s favor (seller owes money), the seller must pay. Without an escrow or holdback to fund this potential payment, the buyer is exposed to seller credit risk. Most agreements include a working capital escrow (often $500K-$2M depending on deal size) to cover potential adjustments.

Pitfall 6: seasonal peg mismatch. If the peg uses a 12-month average and the close happens in a peak or trough month, the adjustment can be very large — not because anyone manipulated the business, but because of where in the cycle the close fell. Both parties should model the expected adjustment under different close-date scenarios before signing.

How working capital adjustment integrates with cash-free, debt-free pricing

Most acquisitions are structured on a cash-free, debt-free basis. ‘Cash-free, debt-free’ means the seller takes the cash on the balance sheet at close, and pays off (or has subtracted from purchase price) the interest-bearing debt at close. The agreed enterprise value reflects what the buyer is paying for the operating business itself, exclusive of cash and debt.

The working capital adjustment is the third leg of the price stool. Enterprise value (EV) is fixed in the agreement. Cash and debt are settled at close based on the actual closing balances. Working capital is settled via the adjustment based on the peg-vs.-actual comparison. Total proceeds to seller = EV + Cash – Debt + (Actual WC – Peg). Each component matters and each is governed by specific contract mechanics.

Coordination across the three legs is essential. Items that are included in working capital should not also be included in cash or debt. A bank overdraft is debt, not negative cash. A line of credit is debt, not negative working capital. Customer deposits are working capital (or deferred revenue), not deferred consideration. Misclassifying an item can lead to double-counting or omission — worth millions in larger deals.

The closing statement reconciles all three. At close, a closing statement (sometimes called a flow of funds memo) shows: enterprise value, plus estimated cash, minus estimated debt, plus estimated working capital adjustment relative to the peg. The estimated figures are settled at close based on a preliminary closing balance sheet. The final figures are settled 60-90 days later based on the actual closing balance sheet. Differences flow back through the true-up.

Sellers’ checklist for working capital negotiations

Lock the methodology in the LOI. The LOI should specify the working capital methodology (e.g., ‘a peg equal to the trailing 12-month average of net working capital, calculated consistent with historical practice and Schedule X to be developed during diligence’). Without this language, the buyer can propose a different methodology during definitive agreement drafting and use it as leverage.

Build the peg calculation yourself before going to market. Pull 18-24 months of monthly balance sheets. Calculate working capital each month using your standard accounting policies. Identify and document any non-recurring items, accounting changes, or seasonal patterns. Have the calculation ready to share with buyers. Sellers who arrive at the negotiation with a defensible peg calculation usually preserve more of their value.

Insist on a worked example schedule in the purchase agreement. The agreement should have a schedule showing the peg calculation in detail, identifying each included line item, and applying the methodology to historical data. This schedule becomes the template for the closing balance sheet calculation and limits dispute scope. Without it, the closing balance sheet calculation can deviate from the peg in ways that cost the seller millions.

Negotiate dispute mechanics carefully. Specify the neutral firm (or firms from which one will be chosen). Specify timing. Specify cost-sharing. Specify what materials each side submits. Specify the neutral’s authority. Limit the neutral’s decision to disputed items only. Avoid mechanics that allow the buyer to gain advantage through process delay.

Manage working capital normally through close. Don’t accelerate collections, don’t stretch payables, don’t draw down inventory artificially. The agreement typically includes covenants requiring the seller to operate in the ordinary course of business. Deviation can trigger claims for breach. Run the business as you have always run it — the peg-and-true-up mechanic is designed to handle normal operations, not artificial moves.

Conclusion

The working capital adjustment is one of the most negotiated and most expensive mechanics in any acquisition. Every dollar of difference between the peg and the closing balance changes hands — and it changes hands months after close, when leverage is gone. The peg is calculated using a methodology, most commonly the 12-month trailing average. The methodology must address seasonality, accounting policies, inclusions and exclusions, and cut-off rules. The closing balance sheet must use the same methodology. The dispute mechanism must be specific and tested. Sellers who arrive at the negotiation with a defensible peg calculation, who lock the methodology in the LOI, and who insist on a worked example schedule in the purchase agreement preserve their value. Sellers who treat working capital as an afterthought lose hundreds of thousands of dollars in the post-close true-up. The work to prepare is straightforward and the protection it provides is substantial.

Frequently Asked Questions

What is a working capital adjustment in an acquisition?

A dollar-for-dollar true-up between the actual working capital at close and a pre-agreed normalized level (the peg). If actual is above the peg, the seller receives the difference. If actual is below the peg, the seller pays the buyer the difference. The mechanism ensures the buyer receives a normal level of operating capital regardless of close timing.

How is the working capital peg calculated?

The most common methodology is the 12-month trailing average of monthly working capital balances. Working capital is calculated each month using the agreed definition (typically AR + Inventory + Prepaids – AP – Accrued Liabilities), summed across 12 months, and divided by 12. Other methodologies (3-month or 6-month average, normalized monthly average, point-in-time peg) are used in specific situations.

Why is the 12-month trailing average the most common methodology?

It captures a full operating cycle, smooths seasonal variation, reflects normalized operations, and is simple to verify from historical financials. Shorter averages risk biasing toward whatever season they cover; longer averages risk including periods that no longer reflect the business. Twelve months is the natural cycle length for most businesses.

How do I handle seasonality in the working capital calculation?

Three approaches. First, accept the mismatch — use a 12-month average peg and let the adjustment compensate the appropriate party based on close timing. Second, define a seasonal peg with month-specific targets. Third, use a normalized closing balance methodology that adjusts the actual close-date balance to a normalized basis. The first approach is the simplest and most common.

What is included in working capital for the adjustment?

Standard inclusions: accounts receivable, inventory, prepaid expenses, accounts payable, and accrued liabilities. Standard exclusions: cash, interest-bearing debt, income taxes, intercompany balances, and related-party balances. Negotiated items vary by deal: deferred revenue, customer deposits, accrued bonuses, accrued vacation, tax receivables. The agreement should define each line item explicitly.

When does the working capital true-up happen?

Typically 60-90 days after close. The buyer prepares a closing balance sheet and calculates actual working capital. The seller has a review period (typically 30-45 days) to verify and dispute. Agreed items settle in cash; disputed items go to a neutral accountant for binding resolution. The full true-up cycle usually completes within 4-6 months of close.

What happens if I dispute the buyer’s closing balance sheet?

The agreement specifies a dispute-resolution mechanism, typically a neutral third-party accounting firm acting as expert. Both parties submit their positions and supporting documentation. The neutral renders a binding decision on the disputed items only (non-disputed items settle separately). The decision is final except for fraud or manifest error. Costs are usually shared based on outcome.

How big is the working capital escrow typically?

$500K to $2M is common in lower-middle-market deals, depending on the size of the deal and the volatility of working capital. The escrow funds any seller-owed true-up payment if actual working capital is below the peg. Escrow durations match the true-up period (typically 90-180 days) and are released after the true-up settles.

Can the seller manipulate working capital before close?

Sellers should not try, and the agreement guards against it. Most agreements include an ‘ordinary course of business’ covenant requiring the seller to operate normally through close. Aggressive collections, stretched payables, or artificial inventory drawdowns can trigger claims for breach. The peg-and-true-up mechanic also catches manipulation: any reduction in working capital flows through to the seller as a payment back to the buyer.

What if the peg methodology in the LOI differs from the definitive purchase agreement?

The definitive agreement controls. If the LOI says ‘trailing 12-month average’ but the definitive agreement says ‘3-month average,’ the 3-month average applies. This is why locking methodology in the LOI matters — the LOI sets the negotiating expectation, but the seller still has to defend the methodology through the definitive agreement drafting. Sellers should engage advisors who watch for late-stage methodology shifts.

How does working capital adjustment work alongside cash-free, debt-free pricing?

Enterprise value is fixed in the agreement. Cash on the balance sheet at close is added to seller proceeds. Debt at close is subtracted. Working capital is settled via the adjustment relative to the peg. Total seller proceeds = EV + Cash – Debt + (Actual WC – Peg). The three legs must be coordinated — an item should not be counted as both debt and working capital, for example.

What’s the most common mistake sellers make with working capital negotiations?

Treating working capital as an afterthought. Sellers focus on the headline price and assume working capital is a technicality. In practice, working capital adjustments routinely move six- or seven-figure dollars in lower-middle-market deals. Sellers who calculate the peg themselves, lock the methodology in the LOI, insist on a worked example schedule, and negotiate dispute mechanics carefully preserve substantially more of their proceeds.

About the Author

Christoph Totter is the founder of CT Acquisitions, a buy-side deal origination firm headquartered in Sheridan, Wyoming. CT Acquisitions sources founder-led businesses for 75+ private equity firms, family offices, and search funds across the U.S. lower middle market ($1M–$25M EBITDA). Christoph writes about M&A from the perspective of someone on the phone with both sides of the deal table every week. Connect on LinkedIn · Get in touch