Take a company that closes the year with current assets of €59m against current liabilities of €36m. Twelve months later, the numbers are €91m and €51m. Textbook working capital has moved from €23m to €40m. The current ratio has improved from 1.64x to 1.78x. Every metric your first-year accounting course taught you says the balance sheet got healthier.
That same company burned €5m of operating cash during the year and only avoided a liquidity squeeze because it drew down €18m of new short-term debt.
The metric didn’t lie. It answered a question nobody in the room was asking.
This is the central problem with current assets − current liabilities: it is a perfectly valid measure of something, and that something is almost never what an investor, a CFO or a deal team actually needs to know. This article works through why the accounting definition breaks, what operating working capital replaces it with, how to draw the line between the two, and where the classification decisions quietly move real money.
What Current Assets − Current Liabilities Actually Measures
The formula wasn’t designed for valuation. It comes from commercial bank lending in the early twentieth century, where the question on the table was narrow and specific: if this borrower stopped trading tomorrow, would the things it could convert into cash within a year cover what it owes within a year?
That is a coverage test under a wind-down assumption. It’s a creditor’s question, and for a creditor it’s a reasonable one. Cash belongs in the numerator, because cash repays loans. Short-term debt belongs in the denominator, because short-term debt is exactly what the lender is worried about. The twelve-month cut-off is arbitrary but defensible as a convention.
The moment you switch to a going-concern frame — you are valuing the business, forecasting its cash, or running it — the useful question changes completely:
How much cash does the operating cycle permanently tie up, and how does that amount move when the business moves?
The accounting definition cannot answer this. Not because it’s imprecise, but because it’s structurally the wrong shape. Three reasons.
1. It mixes operating items with financing items
Cash, marketable securities, short-term debt, accrued interest and dividends payable are all «current». None of them arise from buying, producing, selling or collecting. They are the result of financing decisions and of how much of the profit the owners chose to leave inside the company.
Netting them into the same number as receivables and inventory means the metric moves for reasons that have nothing to do with the operating cycle. Draw €20m on a revolving credit facility and hold it in cash: current assets +20, current liabilities +20, accounting working capital unchanged. Repay it: unchanged again. Meanwhile the business itself hasn’t done anything.
2. It mixes recurring items with one-offs
A litigation provision, a deferred consideration instalment, an insurance claim receivable, a related-party balance, an income tax payable spike after a strong year — all current, all irrelevant to the operating cycle, and none of them will be there next year in the same form.
3. It doesn’t scale with anything
This is the fatal one. A useful balance-sheet metric behaves as a function of a driver you can forecast. Receivables scale with revenue. Inventory scales with cost of sales. Payables scale with purchases. Accrued payroll scales with headcount.
Cash scales with nothing. Short-term debt scales with nothing. Tax scales with profit and with a calendar. Blend all of them together and you get a number that cannot be normalized, cannot be expressed in days, cannot be benchmarked against peers and cannot be forecast. It’s a snapshot with no dynamics.
| Item | Current on the balance sheet? | Economic nature | Behaviour |
|---|---|---|---|
| Trade receivables | Yes | Operating | Scales with revenue |
| Inventory | Yes | Operating | Scales with COGS |
| Trade payables | Yes | Operating | Scales with purchases |
| Cash and equivalents | Yes | Financing / residual | Scales with nothing |
| Revolving credit, current portion of debt | Yes | Financing | Management decision |
| Income tax payable | Yes | Fiscal | Profit and tax calendar |
| Restructuring provision | Yes | One-off | Non-recurring |
| Capex payables | Yes | Investment cycle | Scales with capex, not sales |
Four different behaviours, one number. That’s the whole problem.
Operating Working Capital: The Definition That Survives Contact With Reality
Operating working capital (OWC, also called trade working capital, or simply «net working capital» in a transaction context) keeps only the balances generated by the operating cycle itself:
OWC = Trade receivables + Inventory + Other operating current assets − Trade payables − Other operating current liabilities
The definitional work isn’t in the formula, it’s in deciding what belongs. Instead of arguing case by case, apply three tests. An item is in only if it passes all three.
1. The operating test. Does it arise from buying, producing, selling, collecting or paying for the ordinary activity? If it arises from financing, taxation, investment or a corporate event, it’s out.
2. The recurrence test. Will an equivalent balance exist next year, generated by the same process? A December payroll accrual passes. A one-off insurance settlement doesn’t.
3. The scalability test. Does it move with revenue, cost of sales or headcount in a way you could express as a ratio or as days? If the balance is essentially a management decision or a calendar artefact, it fails.
Everything that fails a test still exists — it just gets handled somewhere else, usually in net debt, in non-recurring items, or in the cash flow’s investing section. Nothing disappears. It gets classified honestly.
The exclusion list, and why
| Excluded item | Where it goes instead | Reason |
|---|---|---|
| Cash and equivalents | Net debt | Financing residual, not operating |
| Bank overdrafts, revolver, current portion of term debt | Net debt | Financing |
| Lease liabilities (IFRS 16) | Net debt | Financing of an asset |
| Accrued interest, dividends payable | Net debt / debt-like | Financing and distribution |
| Income tax payable / receivable | Debt-like / cash-like | Fiscal, not operating |
| Derivatives, hedging instruments | Debt-like | Financial |
| Related-party balances | Settled at closing | Not arm’s length, not recurring |
| Capex payables and capex accruals | Debt-like or investing | Belongs to the investment cycle |
| Restructuring, litigation, onerous contract provisions | Debt-like | One-off, fixed obligation |
| Assets and liabilities held for sale | Excluded | Not part of the ongoing cycle |
| Deferred consideration from prior deals | Debt-like | Corporate event, not operations |
Two of these deserve a note, because they’re the ones people get wrong most often.
Income tax. It fails the scalability test — it tracks taxable profit and the payment calendar of a specific jurisdiction, not the operating cycle. Treating it as working capital creates a metric that jumps around for reasons no operational lever can explain. Standard practice is debt-like or cash-like, which also matches how the tax balance is actually settled.
Lease liabilities. After IFRS 16 the current portion of lease liabilities sits in current liabilities and can be material for retail, logistics or any asset-heavy business. It’s the amortisation of a financing arrangement. Leaving it in working capital understates the metric and double counts against enterprise value, since leases are almost always already in net debt.
The Worked Example: When the Two Metrics Point in Opposite Directions
Back to the company from the opening. Call it Alpha. Revenue grew from €200m to €240m (+20%), cost of sales from €140m to €170m.
| € million | Year 1 | Year 2 | Δ |
|---|---|---|---|
| Cash and equivalents | 5 | 18 | +13 |
| Trade receivables | 30 | 42 | +12 |
| Inventory | 20 | 27 | +7 |
| Other operating current assets | 4 | 4 | — |
| Current assets | 59 | 91 | +32 |
| Trade payables | 18 | 15 | −3 |
| Short-term financial debt | 12 | 30 | +18 |
| Other operating current liabilities | 6 | 6 | — |
| Current liabilities | 36 | 51 | +15 |
| Accounting working capital (CA − CL) | 23 | 40 | +17 |
| Operating working capital | 30 | 52 | +22 |
The two metrics move in the same direction numerically, but they mean opposite things. The accounting figure rising by €17m reads as an improvement. The operating figure rising by €22m is a €22m cash outflow — money that left the company and is now sitting in customer balances and warehouse shelves.
Reconcile it to cash and the story becomes unambiguous:
| € million | Year 2 |
|---|---|
| Cash generated from operations before working capital | +17 |
| Investment in operating working capital | −22 |
| Operating cash flow | −5 |
| New short-term debt drawn | +18 |
| Change in cash | +13 |
The €13m cash increase that flattered the current ratio was borrowed. Every euro of it, and then some.
Reading the movement in days
Expressing OWC as ratios is what makes it forecastable, and it turns the €22m into something you can actually act on.
| Metric | Year 1 | Year 2 |
|---|---|---|
| Current ratio | 1.64x | 1.78x |
| OWC / revenue | 15.0% | 21.7% |
| DSO (days sales outstanding) | 55 | 64 |
| DIO (days inventory outstanding) | 52 | 58 |
| DPO (days payables outstanding) | 47 | 32 |
| Cash conversion cycle | 60 | 90 |
Thirty days of deterioration in the cash conversion cycle. Note the direction of DPO in particular: it fell by fifteen days. A company paying suppliers faster while collecting from customers slower is usually a company whose suppliers have started asking for it — a credit signal that the accounting metric renders completely invisible.
Splitting growth from deterioration
Not all of the €22m is bad news. Growth consumes working capital by definition. Decompose it:
- If OWC had stayed at 15.0% of revenue, Year 2 OWC would be €36m → €6m consumed by growth
- Actual OWC is €52m → €16m consumed by deteriorating terms
That’s the number that matters. Six million funding a 20% expansion is the cost of doing business. Sixteen million disappearing into slower collection, heavier stock and shorter supplier terms is an operational problem — and, in a valuation, a recurring drag on free cash flow that has to be built into the forecast rather than treated as a one-off swing.
The accounting definition gives you €17m and no way to split it.
Where the Classification Decisions Move Real Money
In a transaction the distinction stops being academic and starts being priced. The standard equity bridge runs:
Equity value = Enterprise value − Net financial debt ± (Actual working capital at closing − Normalized working capital target)
Use the accounting definition here and the bridge collapses: cash and debt would be counted twice, once in net debt and again inside working capital. The two components must be mutually exclusive and jointly exhaustive. Every balance sheet line gets assigned to exactly one bucket — operating working capital, net debt, or neither — and the assignment is negotiated.
Which means classification is price.
| Item | Buyer typically argues | Seller typically argues | Practical anchor |
|---|---|---|---|
| Accrued management bonus | Debt-like (reduces price) | Working capital (already in the peg) | Depends on whether it recurs and whether closing precedes the payment date |
| Deferred revenue / contract liabilities | Debt-like | Working capital | Depends on the cash cost of delivering the remaining obligation |
| Overdue payables beyond normal terms | Debt-like | Working capital | Compare the ageing against contractual terms |
| Provision for slow-moving inventory | Insufficient | Adequate | Ageing analysis and historical write-off rates |
| Non-recourse factoring | Add receivables back, treat as debt | Genuine sale, off balance sheet | Look at whether risk actually transferred, and at the fee |
| Reverse factoring / confirming | Reclassify to debt | Ordinary trade payable | Whether the bank has substituted the supplier as creditor |
| Restricted or trapped cash | Not free cash | Cash | Can it be swept to the parent without cost or consent? |
Factoring deserves its own paragraph because it distorts the metric more than anything else on the list. Selling receivables converts a working capital balance into cash. Reverse factoring lets suppliers get paid early by a bank while the company pays later. Both improve the cash conversion cycle on the face of the accounts without any change in how the business collects or pays. Both are financing decisions presented as operating improvements. If you don’t gross them back up, you’ll forecast a working capital profile the business has never actually achieved — and if the facility isn’t renewed post-closing, the unwind lands on the buyer as an immediate cash outflow.
Setting the Normalized Level
The other half of the transaction mechanic is the target — the «peg» — and it’s where a technically correct definition can still produce a wrong answer.
Use monthly data, not year-end. Twelve month-end balances over two or three years. A single year-end figure tells you almost nothing about a seasonal business, and year-end is precisely the date on which the balance is least representative.
Understand the seasonal shape before you average. An agribusiness peaking in September and troughing in February will hand one party a windfall if the peg is set at the December balance and closing happens in May. The direction of that windfall depends on the calendar, not on the merits.
Look for year-end management. The recurring patterns worth checking:
- A supplier payment run deferred into January, inflating payables at 31 December
- A factoring facility drawn just before the reporting date and unwound in the first weeks of the new year
- A collections push or early-payment discount campaign concentrated in the final weeks
- Shipments pulled forward into December, inflating revenue and receivables together
- Inventory purchases postponed across the year-end
Every one of these is visible in monthly data and invisible in annual data. The tell is almost always the January reversal: if the December balance snaps back within four weeks, it was a presentation, not a position.
Tie the movement back to cash. The change in OWC between two dates should reconcile to the working capital line in the cash flow statement, with differences explained by FX, acquisitions, disposals, reclassifications and non-cash provision movements. If it doesn’t reconcile, you have a definition problem or a data problem, and you need to find out which before you build anything on top of it.
In Defence of the Old Formula
Being fair to the metric this article has spent 2,000 words criticising: current assets minus current liabilities is not wrong. It’s narrow.
It remains the right tool in at least four situations:
- Covenant testing. If the facility agreement defines a working capital or current ratio covenant, that contractual definition governs. It doesn’t matter what’s analytically superior — the lender’s formula is the one that triggers a default.
- Rapid screening at scale. Running a first pass over a hundred potential targets with nothing but summary financials, the current ratio is a cheap filter. A company at 0.6x deserves a closer look. That’s all it needs to tell you.
- Going-concern and distress work. When the wind-down assumption becomes realistic rather than hypothetical, the original question the formula was built to answer becomes the relevant one again.
- Statutory presentation. The current/non-current split is a reporting requirement. You need to understand it to navigate the accounts, even when you immediately restructure it for analysis.
The failure isn’t in the formula. It’s in using a liquidity coverage test as a proxy for operating cash intensity, and then forecasting off it.
A Working Checklist
Before you put a working capital number into a model, a bridge or a board pack:
- Every current line item assigned to exactly one of: operating working capital, net debt, or excluded — with a written reason.
- Monthly data for 24–36 months, not year-ends.
- Every balance expressed as a ratio or in days against its natural driver (revenue, COGS, headcount).
- The movement reconciled to the cash flow statement, with differences explained.
- Factoring and reverse factoring grossed back up to reveal the underlying DSO and DPO.
- Growth separated from deterioration — grow the current ratio forward, then layer any structural change on top as an explicit assumption.
- The January balances checked against December for anything that reverses.
None of this is complicated. It’s mostly bookkeeping discipline applied with an economic question in mind rather than a presentational one. But it’s the difference between a working capital figure that tells you where the cash went and one that tells you a company borrowing €18m to stay afloat had a strong year.
Deja una respuesta