Working Capital in German SME Acquisitions: From LOI to Locked Box
Working capital disputes are among the most common sources of post-closing friction in German SME acquisitions, and they are almost entirely preventable. They arise not from bad faith but from a gap in expectations that forms long before the purchase agreement is signed: the buyer is thinking about normalized, professionally managed working capital; the seller has never applied that concept to a business he has run by instinct for three decades. Closing that gap is analytical work. Failing to close it is expensive.
Begin with the mechanics. The cash conversion cycle — Days Inventory Outstanding, Days Sales Outstanding, Days Payables Outstanding — describes how long cash is tied up moving through the business. DIO measures the average time inventory sits before it is sold. DSO captures how long receivables remain outstanding after a sale. DPO reflects how long the company takes to pay its own suppliers. Together they define the working capital profile of a business: how much capital it requires simply to operate at a given level of revenue, independent of investment or debt service.
In a professionally managed company with active treasury oversight, these metrics are tracked monthly and managed against benchmarks. In a German owner-managed GmbH that has operated for twenty years with a tax-optimized set of accounts and no external investors, they are rarely tracked at all. Small and medium-sized Mittelstand companies often lack sophisticated reporting processes — largely because the manager is also the owner, and thus no external reporting is necessary (Lexology / Rittershaus, 2025). The practical consequence for a buyer is that working capital data extracted from the target's accounts may not reflect the actual cash dynamics of the business. Receivables aging reports, where they exist, may include long-overdue balances from customers with whom the founder has a personal relationship and an informal arrangement. Inventory valuations may not have been adjusted for obsolescence. Payables may include deferred amounts under bilateral supplier agreements that predate any written contract. The analyst's first task is not to calculate working capital but to reconstruct it from underlying data.
Setting a working capital peg — the agreed level of net working capital that should be present in the business at closing — requires taking a view on what is normal. The standard approach is a trailing twelve-month average of monthly working capital, which smooths seasonal peaks and troughs. This works well for a business with stable seasonality and clean monthly accounts. It fails in two common situations: first, where the business has recently experienced a material change in trading conditions that makes the historical average misleading; and second, where the business has pronounced seasonal inventory patterns that a simple average will misrepresent at any given closing date. A distribution company that stocks heavily before the winter months will show materially different working capital in October than in March. An LOI that specifies a trailing twelve-month average without also addressing seasonality methodology is an LOI that will generate a dispute.
The choice between a locked box mechanism and completion accounts is, for transactions below €30 million in enterprise value, primarily a question of account quality and deal timeline. Under the locked box mechanism, the purchase price is established by reference to an agreed set of historic accounts. Those accounts fix the equity price in respect of the cash, debt, and working capital present at the locked box date; the price is then written into the SPA and not adjusted further at closing (Lewis Silkin, 2024). The mechanism is clean and eliminates post-closing price adjustment risk for both parties. Its limitation in the German lower mid-market is the same as its limitation everywhere: it requires reliable, audited accounts at the locked box date. The quality of financial reports among small German targets varies considerably, which in practice increases due diligence costs and can undermine the reliability of any locked box balance sheet (IMAP, 2026). Where accounts have been prepared primarily for tax purposes — the rule rather than the exception in owner-managed GmbHs — the locked box date balance sheet may not provide a sufficiently rigorous basis for fixing the price without material verification work.
Completion accounts, the traditional alternative, measure actual working capital at the closing date and adjust the price accordingly if the outcome deviates from the peg. German M&A transactions commonly follow either a locked box model or a cash-free/debt-free mechanism with working capital adjustment at closing, with the choice driven largely by deal complexity and account reliability (Chambers and Partners, 2025). The completion accounts approach provides more certainty that the buyer is paying for what is actually in the business, at the cost of additional time, professional fees, and post-closing process. For complex German succession situations where the seller's accounts are informal and the business has material working capital variability, completion accounts are often the more appropriate mechanism despite their administrative burden — the friction is the price of clarity.
The anonymized example worth drawing on here involves a B2B distribution company in Baden-Württemberg acquired through a bilateral succession process. The LOI had specified a working capital peg based on the most recent annual accounts, without reference to seasonality or a methodology for handling related-party receivables. At closing, two items created a dispute. First, the actual inventory value at closing was significantly below the peg, because the closing date fell at the end of the high-inventory season and the historical accounts had been prepared mid-cycle. Second, a receivable of approximately €180,000 from a supplier with whom the founder had a reciprocal trading arrangement had been included in the peg calculation but was excluded from the buyer's closing calculation on the basis that it was not a bona fide trade receivable. Both disputes were resolvable but consumed eight weeks of post-closing negotiation and professional advisor time that neither party had budgeted for.
Prevention requires specificity at the LOI stage, not the SPA stage. A working capital definition that explicitly enumerates included and excluded line items, a clearly agreed methodology for handling seasonality, a mechanism for independent verification of inventory values, and a process for resolving disputes that does not default to litigation — these provisions transform the working capital section from a source of post-closing conflict into a mechanical process that runs to its conclusion without drama. Post-M&A disputes in Germany are rising as a tightening economy puts pressure on the commercial viability of completed transactions (Lexology, 2024). The working capital section is not where deals are won. It is, with increasing regularity in the current environment, where they are lost after the fact.
Sources
Lewis Silkin LLP, US/UK M&A: Price Adjustment Mechanisms — The Locked Box (2024). Practitioner overview of locked box mechanics and leakage protection, widely applicable to European transactions.
Chambers and Partners, Corporate M&A 2025 — Germany, Global Practice Guides (2025). Annual survey of German M&A legal practice covering price mechanisms, due diligence standards, and SPA structure.
Lexology / Rittershaus, M&A in the German Mittelstand (2025). Practitioner guide to the structural and cultural characteristics of Mittelstand transactions, including reporting deficiencies and compliance gaps.
IMAP, Inside the German M&A Market in 2026: Resilient Small- and Mid-Cap Deals (2026). Annual market overview from one of Germany's leading mid-market advisory firms covering deal dynamics, financing conditions, and due diligence trends.
Lexology, Germany M&A: Introduction (2024). Survey-level overview of the German M&A regulatory framework and post-closing dispute trends.
ICLG, Private Equity Laws and Regulations Report 2025 — Germany (2025). Regulatory and deal structure reference covering PE transaction types, due diligence scope, and warranty and indemnity practice in German transactions.
