Working capital: the money that runs your day to day

Some businesses sell well, have customers, and still live with water up to their necks: rent day or payroll arrives and the money isn't there, even though "on paper" everything looks fine. Almost always the problem isn't that they sell too little. It's that they don't have enough working capital. And though the name sounds like accountant jargon, the idea behind it is one of the most useful things a business owner can grasp.

Working capital is, in plain words, the money you have available to keep your business running day to day. It's what you have left to operate after covering what you owe in the short term. Let's take it apart.

The most important subtraction in your business

The formula is so simple it fits on one line. According to financial sources like J.P. Morgan and NetSuite, working capital is calculated like this:

Working capital = current assets − current liabilities.

Don't let the names scare you. Current assets are the money you have or will have soon: what's in the account, what your customers owe you, and the inventory you can sell. Current liabilities are what you have to pay soon: suppliers, this month's rent, short-term loans. Subtract one from the other and that's your working capital.

A kitchen-table example

Imagine a taco shop. There's 80,000 in the account, event clients owe 20,000, and there's 20,000 in stored supplies. Its current assets add up to 120,000. On the other side, it owes 60,000 to the meat supplier and 30,000 between rent and this month's utilities. Its current liabilities add up to 90,000.

Working capital: 120,000 minus 90,000 equals 30,000. That's the cushion the taco shop breathes with. If sales dip one week or a client pays late, those 30,000 let it keep buying meat and paying its people without panic. This is exactly the kind of example financial guides use to explain it.

Positive, negative, and why it matters

When the subtraction comes out positive, like in the example, your business can comfortably cover its short-term debts. When it comes out negative, meaning you owe more than you have available soon, it's a warning sign: it means you might not be able to pay on time, even if the business is fundamentally good.

The sources say it plainly: for most small businesses, negative working capital indicates a liquidity problem that needs immediate attention. It's not the end of the world, but it's like driving with no reserve fuel: any surprise leaves you stranded.

• Current assets: cash, what customers owe you, sellable inventory
• Current liabilities: suppliers, rent, short-term loans
• Positive working capital: you breathe, you weather surprises
• Negative working capital: a liquidity warning, address it soon
• Selling a lot doesn't guarantee healthy working capital

How much cushion is enough

More isn't always better. There's a related measure, the current ratio, which you get by dividing current assets by current liabilities instead of subtracting them. Financial guides often flag a range between 1.2 and 2.0 as healthy, though it varies a lot by the type of business.

Below 1 you're short: you can't cover what you owe soon. Far above 2 isn't ideal either, because it can mean you have money sitting idle that you could be using to grow. The point isn't to pile up cash for no reason, but to have enough to sleep easy.

How to look after it without being an accountant

The most practical thing for a small business is to watch the speed of money: how long you take to collect from customers and how long you take to pay suppliers. If you collect fast and pay at a reasonable pace, your working capital stays healthy almost on its own. If you let customers pay very late while you pay everything immediately, money slips away even when you're selling well.

Small habits help a lot: collecting on the spot or asking for deposits, not buying more inventory than you'll sell soon, and negotiating slightly longer terms with your suppliers. None of this requires a master's in finance, just paying attention to the rhythm of your cash.

The takeaway

Working capital is the money that keeps your business running between selling and getting paid. It's a simple subtraction, current assets minus current liabilities, but behind it lies the difference between operating calmly and living on a thread. Do that subtraction today with your own numbers. If it's positive, protect it. If it's negative, you now know where the real problem is, and that's half the solution.

Sources

• J.P. Morgan — https://www.jpmorgan.com/insights/treasury/receivables/what-is-working-capital-formula-and-how-to-calculate-it
• NetSuite — https://www.netsuite.com/portal/resource/articles/financial-management/working-capital.shtml
• AccountingCoach — https://www.accountingcoach.com/working-capital/explanation
• BDC — https://www.bdc.ca/en/articles-tools/entrepreneur-toolkit/templates-business-guides/glossary/working-capital
• Xero — https://www.xero.com/us/guides/current-ratio/