Working capital

Working capital is the operating capital tied up in receivables, inventory and payables while the business keeps moving. It is where finance and operations meet: the company must fund the gap between doing the work and receiving the cash.

In brief

Working capital is not only a balance-sheet line. It is the financial expression of operating rhythm.

Receivables show how long customers take to pay. Inventory and WIP show how much work or material is held before conversion. Payables show how supplier timing supports or pressures the cycle.

When working capital grows faster than the business can absorb, growth becomes fragile.

Operational definition

Working capital is usually read through receivables, inventory and payables.

In operational terms, it answers a practical question: how much capital is tied up because the company must buy, produce, hold, deliver or wait before it collects?

The amount depends on payment terms, process lead time, inventory policy, customer behaviour, supplier terms and invoicing discipline.

Why it matters for SMEs

SMEs often grow into working-capital pressure. More orders require more material, more work in progress and more financing of customer payment time.

If processes are slow or rework is high, working capital increases silently. If customer concentration is high, one customer’s terms can shape the whole liquidity profile.

For investors, working capital quality matters because it shows whether growth consumes or releases cash.

Observable signals

Look for receivables growing faster than sales.

Look for inventory or WIP accumulating without clear reason.

Look for late invoicing after work is complete.

Look for supplier payments due before customer cash arrives.

Look for growth that increases stress instead of room.

Common mistakes

Treating working capital as only a finance department issue.

Ignoring the operational causes of inventory and receivables.

Negotiating customer terms without understanding the cash cycle.

Improving sales volume while worsening the timing of cash.

Operational example

A manufacturing SME grows revenue but feels tighter each month. Finance shows receivables rising. Operations shows lead time rising too, because jobs remain in WIP longer after technical changes.

The working capital problem is partly operational. Reducing rework and closing jobs faster reduces the capital tied up before invoicing.

Diagnostic questions

Where is capital tied up: receivables, inventory, WIP or timing gaps?

Which customers or products create the longest cycle?

Which process delays postpone invoicing?

Which stock is deliberate buffer and which is hidden inefficiency?

Do payment terms match the operating cycle?

Practical implications

Read working capital by flow, not only by account. Connect receivables to invoicing discipline, inventory to WIP and buffers, and payables to supplier rhythm.

Then identify which operational intervention would release capital: shorter lead time, cleaner completion, lower rework, better terms or reduced variety.

MARTRO reading

In MARTRO’s reading, working capital is an operating signal. It often reveals process latency, WIP, customer concentration, cost of variety and weak completion rules.

Frequently asked questions

Is working capital only financial? No. It is shaped by operating choices.

Why can growth increase working capital pressure? Because the company must fund more work before being paid.

What operating factors affect working capital? Lead time, rework, inventory policy, payment terms, invoicing discipline and customer mix.

Can reducing rework improve working capital? Yes. Faster and cleaner flow reduces time before invoicing and collection.

What should an SME review first? Receivable days, WIP age, inventory movement and time from delivery to invoice.