Liquidity & Cash Flow

The Unpaid Invoice Costs More Than Its Amount

A €10,000 bad debt does not cost €10,000. At a 5% margin, you need €200,000 in new revenue just to break even. Why "selling more" is not the fix.

Konstantinos Kormentzas
The Unpaid Invoice Costs More Than Its Amount

A bad debt costs multiples of its amount

An unpaid €10,000 invoice at a 5% net margin means €200,000 in new revenue just to break even. Most businesses book it as an expense — and that framing hides the real size of the loss. You did not only lose the accounting profit of the sale. You lost the working capital you spent to deliver it: the VAT you remitted, the goods you bought, the labor hours.

To recover that money, selling another €10,000 of goods is not enough. You must generate enough new revenue for its profit to fill the hole. And the lower your margin, the harder you have to run.

How much revenue covers a bad debt?

The calculation is simple: loss ÷ net margin = required new revenue. At a 5% margin, a €10,000 bad debt requires €200,000 in new sales just to break even. The chart shows the leverage of thin margins:

The Recoup Multiplier

New sales required to cover a €10,000 bad debt, by net margin (illustrative model)

Source: ONISIS analysis, 2025

20x
is the Sales Multiplier for a business at a 5% net margin: €20 of new revenue for every €1 of loss (Source: ONISIS analysis, 2025)

Take a distributor operating at a 5% net margin. One €10,000 bad debt means finding €200,000 in new sales — solely to bring the till back to where it was. That difference proves that credit control protects your profitability — it is not bureaucracy.

Why "selling more" deepens the hole

Because aggressive growth creates its own liquidity crisis. When you chase volume to cover a bad debt, cash outflows always run ahead of collections:

  • Credit to customers. To land the "big order", you extend credit or accept a 5–6 month check.
  • Prepayment to suppliers. You must buy the goods now.
  • VAT remittance. You pay the sale's VAT months before you collect the invoice.

The liquidity snare

Accounting revenueCash available

The divergence of revenue and cash in a growth phase (illustrative model)

Source: ONISIS analysis, 2025

At the end of Q4, the business celebrates a sales record — and simultaneously cannot pay. Without pre-arranged bank support, that is the breaking point. Revenue climbs, the till empties.

Three changes that protect the till

Cash flow management is a matter of systems, not luck. Three changes make the difference:

Commissions follow collection

Salespeople are usually paid on invoicing, regardless of whether the customer pays. Tie commissions to collection: if the invoice is not paid, the commission is not paid. A sale to a high-risk customer is a liability, not a win.

Inventory is liquidated, not stored

Excess inventory is frozen money. Apply the 80/20 rule to stock: slow-moving items are liquidated immediately, even at a reduced margin, to free up capital.

The forecast looks 13 weeks ahead

The annual budget is static. The rolling 13-week forecast shows you the liquidity "wall" three months before you hit it — and gives you time to react.

When does a customer start becoming a credit risk?

When their own bank will not lend to them. If your customer's bank refuses to finance them, why are you extending them credit? When you raise a customer's credit limit without security, you are effectively an interest-free bank.

In uncertain times, tightening terms is a safer growth strategy than increasing volume with risky customers. Cutting credit terms from 60 to 30 days loses only the customers who were never going to pay.

Measure your own dead point

Cash flow management starts with three numbers: your net margin, the payment terms of your five largest customers, and the aging of the rest — which invoices are over 90 days old.

Ask your finance manager for the receivables aging this week, not the balance sheet. Cash flow management starts there: a reading of how you collect, with numbers, no strings attached.