Overtrading: when growth consumes the cash it creates

What is overtrading, exactly?

Overtrading is growth the balance sheet can’t carry. Sales rise, margins hold, the income statement looks strong — and the bank account keeps getting tighter. It’s one of the most frustrating problems an owner or finance lead can face, because the business is doing everything right commercially and still running short of cash.

The mechanism is simple. Every dollar of sales requires some working capital before it turns back into cash: stock bought ahead of the sale, then an invoice waiting to be paid. Suppliers fund part of that through their terms. The rest the business funds itself. When sales grow, that self-funded amount grows with them. If profit retained in the business doesn’t keep pace, the gap is filled by the overdraft, by stretching suppliers, or — most dangerously — by using money set aside for tax.

The maths behind it

Take an illustrative business with a cash conversion cycle of 70 days. Working capital tied up is roughly turnover × 70 ÷ 365.

Illustrative turnover	Working capital tied up	Increase
$10m	$1.92m	—
$13m (+30%)	$2.49m	+$0.57m
$16.9m (+30%)	$3.24m	+$0.75m

Illustrative only; no real business. Two years of 30% growth adds about $1.3 million of working capital. If the business earns, say, $600,000 after tax each year and distributes some of it, retained profit may cover well under half that increase. The rest must come from somewhere.

That’s the core of overtrading: growth has a working capital price, and profit alone often can’t pay it. Run your own numbers through the working capital cycle calculator — it shows the extra working capital required at your chosen growth rate.

What are the warning signs?

The signals appear in the bank account and the tax portal well before the annual accounts.

In the bank account

• The overdraft or line of credit hasn’t dropped below 80–90% utilisation for months
• Payroll weeks are increasingly tight
• Large supplier payments are being split or timed around receipts

In the ledgers

• Debtor days creeping up quarter on quarter — often because new, larger customers pay slower
• Creditor days lengthening informally as suppliers are paid late
• Stock levels rising faster than sales, especially if new lines were added

In statutory obligations

• BAS paid late or by instalment
• PAYG withholding slipping
• Super contributions under pressure — and since 1 July 2026, Payday Super requires contributions to reach employees’ funds within 7 business days of payday, leaving much less room to catch up

In relationships

• Suppliers asking for deposits or shortening terms
• The bank asking questions about the account’s conduct
• Staff noticing delayed reimbursements or overtime approvals

Two or more of these, in a year of strong sales growth, is a classic overtrading pattern.

Why do bigger customers make it worse?

Growth often comes from winning larger customers, and larger customers often pay more slowly. The Payment Times Reporting Regulator reported in February 2026 that the average number of days large businesses take to pay 95% of their small business invoices rose to 64 days from 58. A supplier used to 30-day customers who lands a major account can see its debtor days jump sharply, and its funding need with them.

Concentration adds a second risk: if the big customer delays payment or reduces orders, the business feels it immediately. Our guide to customer concentration explains how lenders view it.

If a big contract is behind your growth, see how to fund contract mobilisation before the first invoice lands.

How do you fix it?

1. Measure the cycle precisely

Calculate debtor, inventory and creditor days monthly, not annually. Know what one day of each is worth in dollars. A day of debtors at $15 million turnover is worth around $41,000.

2. Pull the operational levers

• Collections: invoice promptly, enforce terms, offer electronic payment, follow up systematically.
• Stock: cut slow lines, tighten reorder points, negotiate consignment for bulky items.
• Suppliers: negotiate formal terms that match your customers’ terms, rather than stretching informally.
• Pricing: make sure the price of a large account reflects the working capital it consumes.

3. Set a growth rate you can fund

Compare the working capital growth demands with retained profit. If the gap is too large, either slow growth, change its shape (fewer slow payers, lower stock intensity), or fund the difference externally.

4. Fund the structural gap — properly

What’s left after operational fixes is structural. It belongs in a facility designed for it, not in the tax account:

• A working capital facility or line of credit for the revolving part
• A term facility for the permanent step up in working capital
• Property-backed limits from $20,000 to $5,000,000 where the gap is large; unsecured options typically $5,000 to $500,000 sized on turnover and bank statements

If you’re seeing the warning signs now, it’s worth talking before the bank does. Get a view on funding your growth — there’s no credit check to enquire.

What if the bank has already reacted?

Banks notice overtrading through account conduct. A common response is to hold or reduce limits at review — exactly when the business needs more. If that’s happened, see what to do when the overdraft is cut. The key is to present the problem as a measured working capital need with a plan, not a cash crisis.

Illustrative turnaround

Illustrative only; no real business. A food distributor grew from about $14 million to $21 million turnover in two years, largely through two supermarket-supplier contracts on longer payment terms. Its overdraft was permanently drawn, supplier terms were being stretched, and a BAS had been paid late.

The CFO measured the cycle: debtor days had moved from 38 to 55, inventory days had risen with a wider range, and creditor days had been stretched unofficially. The business trimmed the range, formalised supplier terms, and repriced one contract to reflect its payment profile. The remaining structural gap was funded with a property-backed working capital facility over the company’s warehouse, sized on the measured cycle rather than a round number. Within two quarters the BAS was on time again and the bank’s next review was routine.

A monthly overtrading dashboard

Track these every month and share a one-page version with your bank:

1. Turnover (rolling 12 months) and growth rate
2. Debtor, inventory and creditor days
3. Net working capital in dollars
4. Facility utilisation — average and peak
5. Statutory obligations: all current, yes or no
6. Retained profit vs working capital increase, year to date

Overtrading or undercapitalised?

The two look alike but differ in cause. Overtrading is a growth problem: the cycle may be fine, but sales are rising faster than retained profit can fund. Undercapitalisation is a structural problem: the business never had enough equity or long-term funding for its model, even at steady turnover. The fixes overlap — measured cycles, proper facilities — but undercapitalisation usually also needs equity or long-term debt rather than a larger revolving limit.

Talking to your bank before it talks to you

If the warning signs are there, a short note to the relationship manager — the growth, the measured cycle, the plan and the funding you’re arranging — reframes the account’s heavy use as managed growth rather than distress. Banks respond far better to a business that names its own working capital problem than to one whose problem shows up first in the account’s conduct.

Growing fast and feeling the squeeze?

Growth is the right problem to have — as long as it’s funded. Bring us your turnover trend, the cycle and the security available, and we’ll tell you what structure would carry the next stage.

Asking the question won’t trigger a credit check. Your details go to one specialist, not a list of lenders, and you’ll talk to someone who reads working capital for a living. Please give accurate turnover, existing facility and security details on the form so we can size the gap properly first time. See if you qualify for growth funding.