Working capital is the difference between a business's current assets and its current liabilities. Put simply, it's the money a company has available to cover its short-term obligations: paying suppliers, covering wages, restocking inventory, and keeping the lights on. It's one of the most practical financial measures there is, and a low or negative working capital figure is often the first warning sign that a business is in trouble.
The basic formula
Working capital is calculated with a single equation:
Working capital = current assets minus current liabilities
Current assets include cash, accounts receivable (money owed to the business), and inventory. Current liabilities include accounts payable (money the business owes to others), short-term loans, and any other debts due within 12 months. If a business has $500,000 in current assets and $300,000 in current liabilities, its working capital is $200,000.
A positive figure means the business can meet its short-term commitments. A negative figure means it can't, at least not without borrowing or selling assets. That's a serious position to be in, regardless of how profitable the business looks on paper.
Why profitability doesn't tell the whole story
This is where many business owners get caught out. A company can be profitable and still run out of cash. It happens constantly. A construction firm might win a major contract, do the work, and issue the invoice. But if the client takes 90 days to pay and the firm's suppliers want payment in 30, the gap is a working capital problem. No amount of profit fixes a timing mismatch that leaves you unable to make payroll.
This is why cash flow and working capital are discussed together so often. They're related but distinct. Cash flow tracks the movement of money over time. Working capital is a snapshot of your short-term financial position right now. Both matter, and neither replaces the other.
The working capital ratio
Beyond the raw dollar figure, analysts often look at the working capital ratio, also called the current ratio. It divides current assets by current liabilities rather than subtracting them.
A ratio above 1.0 means the business has more short-term assets than liabilities. A ratio below 1.0 signals the reverse. Most accountants consider a ratio between 1.2 and 2.0 to be healthy for most industries, though capital-intensive businesses and subscription-based companies often run quite differently from that range.
A ratio that is very high can actually be a problem too. It might indicate that the business is sitting on excess cash or holding too much inventory, rather than reinvesting that capital effectively. The goal isn't the highest number possible. It's the right number for your business model and industry.
What affects working capital
Three variables do most of the work: how quickly you collect from customers, how quickly you pay suppliers, and how long inventory sits before it sells. Businesses that collect fast, pay slow, and turn stock quickly tend to have strong working capital positions. Those with slow-paying clients, demanding suppliers, and perishable or slow-moving inventory tend to feel squeezed.
Seasonal businesses face a particular challenge. A retailer might accumulate inventory for months ahead of Christmas, straining working capital in October and November before revenue floods in during December. Planning for that cycle is essential. Many businesses that fail do so not because they're unviable, but because they don't anticipate the seasonal dip.
How businesses improve their working capital
There are a few practical levers most businesses can pull:
- Tighten debtor terms. Invoice promptly and follow up on overdue accounts. If customers are taking 60 days to pay and your terms say 30, chase them.
- Negotiate supplier terms. Extending payment terms from 30 days to 45 or 60 gives the business more breathing room without borrowing anything.
- Reduce inventory. Holding less stock frees up cash. Just-in-time ordering works well for businesses with reliable suppliers.
- Use a line of credit strategically. A revolving credit facility can bridge short-term gaps without locking up long-term debt.
None of these are complicated in isolation. The difficulty is doing all of them consistently while running a business day to day.
Working capital and business growth
Growth can actually destroy working capital if it's not managed carefully. A fast-growing business needs more inventory, more staff, and more cash tied up in receivables, all before the extra revenue arrives. This is sometimes called "overtrading," and it's a genuine risk for ambitious small businesses.
Understanding your budget and forecasting working capital requirements before a growth phase is one of the most underrated pieces of financial planning a business can do. Investors and lenders scrutinise working capital closely for exactly this reason. It tells them whether a business can fund its own operations or whether it will constantly need external support.
For anyone trying to get a full picture of a company's financial health, working capital sits alongside the balance sheet as one of the clearest indicators of whether the business is running on solid ground or surviving on borrowed time. Get the number right, and most other financial problems become much easier to manage.