Working Capital: What It Is, Why It Matters, and How to Improve It

Working capital is the money that keeps your business running day to day. It is the gap between what you are owed and what you owe — and for most SME owners, it is the number that quietly determines whether you can pay your suppliers, make payroll, and still have cash left to grow.

The formula is simple: Current Assets minus Current Liabilities. But understanding what drives it, and how to improve it, is where most business owners get stuck.

Why working capital matters more than profit

A business can be profitable and still run out of cash. This happens more often than most people realise — and it almost always comes down to working capital timing. You might have won a large order, but if you have to pay your suppliers before your customer pays you, that gap has to be funded somehow.

The three components that drive your working capital position are:

• Debtor days — how long customers take to pay you
• Creditor days — how long you take to pay suppliers
• Stock days — how long inventory sits before it is sold

The relationship between these three numbers is called the cash conversion cycle. The longer your cycle, the more cash you need to fund operations at any given moment.

The working capital trap

Growth makes working capital problems worse, not better. Every time you take on a larger order or expand your product range, you need more cash to fund the gap between spending and receiving. Many SME businesses have grown themselves into a cash crisis because they focused entirely on the top line without tracking the cash impact.

Five ways to improve your working capital position

1. Shorten your debtor days

Invoice the same day work is complete or goods are dispatched. Offer a small early payment discount for large customers. Chase overdue invoices within 24 hours of the due date, not weeks later. Every day you reduce debtor days on a £500k revenue business is worth roughly £1,400 in freed-up cash.

2. Extend creditor days (carefully)

Negotiate longer payment terms with suppliers, particularly on large or repeat orders. Moving from 30-day to 60-day terms on your main supplier is equivalent to a free short-term loan. Do not damage supplier relationships — but do ask.

3. Reduce stock days

Dead stock is frozen cash. Review your slowest-moving lines and either discount to clear, return to supplier, or stop reordering. Tighten your reorder quantities based on actual demand rather than buying in bulk for the discount alone.

4. Match payment terms to your cycle

Where possible, structure customer payment terms to match your supplier payment obligations. If you pay suppliers in 30 days, try to collect from customers in 21 days. Even a partial match reduces the funding gap significantly.

5. Forecast it, do not just react to it

Most working capital problems are visible weeks in advance if you are tracking the right numbers. A rolling 12-week cashflow forecast will show you exactly when the pressure points are coming — giving you time to act rather than react.

What a healthy working capital ratio looks like

A current ratio (current assets divided by current liabilities) of between 1.5 and 2.0 is generally considered healthy for a trading SME. Below 1.0 means your short-term liabilities exceed your liquid assets — a warning sign that needs urgent attention. Above 3.0 may suggest you are holding too much idle cash or stock that could be working harder.

The right number varies by sector. Retailers typically run tighter ratios than service businesses. Importers typically need more working capital than domestic-only traders because of the lead time gap between paying for goods and receiving them.

The bottom line

Working capital is not an accounting concept — it is a commercial discipline. The businesses that manage it well grow faster, survive downturns better, and have more options when opportunities arise. The ones that ignore it often find out too late that profit and cash are two very different things.