Working capital is current assets minus current liabilities
Working capital tells you whether your business has enough liquid money to pay bills and run day-to-day operations. The formula is straightforward: take everything your business owns that can be converted to cash within a year, subtract everything it owes that is due within a year, and the result is your working capital.
A positive number means you have a cushion. A negative number means you are spending faster than you are collecting, which signals cash flow trouble even if the business is technically profitable on paper.
Key Takeaways
- Working capital = current assets minus current liabilities, and you calculate it from the balance sheet line items your accountant already tracks.
- Current assets include cash, accounts receivable, inventory, and prepaid expenses; current liabilities include accounts payable, short-term debt, and accrued wages.
- A positive working capital means you can cover short-term obligations; negative working capital means cash is tight and you may struggle to pay suppliers or payroll.
- Working capital changes month to month as you collect payments and pay bills, so track it regularly rather than once a year.
- Industry norms vary widely—a retail business needs more inventory cushion than a service business, so compare your ratio to competitors in your field.
Identify your current assets
Current assets are anything your business owns that you expect to turn into cash within the next 12 months. Start with your balance sheet, which your accountant prepares or which accounting software like QuickBooks or Xero generates automatically.
The main items are: cash (money in the bank right now), accounts receivable (money customers owe you for work already done), inventory (goods you hold to sell), and prepaid expenses (rent or insurance you paid in advance). Add these four categories together. If you have other short-term assets—such as short-term investments or a refund you expect from a vendor—include those too.
Do not include equipment, vehicles, or property. Those are long-term assets and take longer than a year to convert to cash.
Identify your current liabilities
Current liabilities are debts and obligations due within the next 12 months. Again, your balance sheet lists these.
The main items are: accounts payable (money you owe suppliers for materials or services already received), short-term debt (loans or lines of credit due within a year), accrued wages (payroll you owe employees but have not yet paid), and sales tax payable (tax collected from customers that you owe to the state). Include any other bills due soon—utilities, rent, insurance premiums, or contractor invoices. Add all of these together.
Do not include long-term debt like a mortgage on a building or a loan due in five years. Those are long-term liabilities.
Subtract liabilities from assets
Take your total current assets and subtract your total current liabilities. The result is your working capital.
Example: A small marketing firm has $50,000 in cash, $30,000 in accounts receivable (invoices sent but not yet paid), and $5,000 in prepaid software licenses. That is $85,000 in current assets. It owes $20,000 to vendors, has $10,000 in accrued payroll, and owes $5,000 on a line of credit due next year. That is $35,000 in current liabilities. Working capital is $85,000 minus $35,000, or $50,000. The firm has a healthy cushion.
If the number is negative, it means liabilities exceed assets. That does not automatically mean the business is failing—some industries run on negative working capital by design—but it does mean cash flow is tight and you need to watch collections and payments closely.
Track working capital over time
Working capital changes as you collect invoices, pay bills, and buy inventory. Calculate it monthly or quarterly, not just once a year, so you can spot trends before they become problems.
If working capital is shrinking month to month, it usually signals one of three things: customers are paying slower, you are paying suppliers faster, or inventory is building up. Each has a different fix. If receivables are the problem, tighten your invoicing or offer a small discount for early payment. If payables are the problem, negotiate longer payment terms with suppliers. If inventory is the problem, reduce orders or speed up sales.
Many accounting software packages let you set up a dashboard that shows working capital automatically each time you close the books. If you use spreadsheets, create a straightforward table with the date, current assets, current liabilities, and working capital, and update it each month.
Understand the working capital ratio
Some business owners also calculate the working capital ratio, which is current assets divided by current liabilities. This tells you how many dollars of assets you have for every dollar of debt due soon.
A ratio of 1.5 to 3.0 is often considered healthy, meaning you have $1.50 to $3.00 in assets for every $1.00 in short-term debt. A ratio below 1.0 means liabilities exceed assets and cash is tight. A ratio above 3.0 may mean you are holding too much cash that could be invested in growth.
However, the "right" ratio depends on your industry. Retail businesses typically need a higher ratio because they carry large inventory. Service businesses can operate with a lower ratio because they have little inventory. Compare your ratio to other businesses in your field, not to an absolute standard.
Common reasons working capital goes negative
Negative working capital is not always a crisis, but it does mean you need to manage cash carefully. The most common causes are: customers paying late (accounts receivable grows while cash stays flat), you paying suppliers early to get discounts, inventory sitting unsold, or taking on short-term debt to fund growth.
If you are in a seasonal business—such as retail or landscaping—working capital may swing wildly between seasons. In slow months, inventory sits and receivables pile up while you still pay rent and payroll. In busy months, cash comes in fast. Track working capital through a full year cycle so you can plan for the lean months and build a cash reserve during the busy ones.
If negative working capital persists and you cannot explain it, talk to your accountant. It may signal a pricing problem, a collections problem, or a spending problem that needs fixing.
Frequently Asked Questions
What is the difference between working capital and cash flow?
Working capital is a snapshot of assets minus liabilities at one moment in time. Cash flow is the movement of actual money in and out of your bank account. You can have positive working capital but negative cash flow if customers owe you money but have not paid yet. Conversely, you can have negative working capital but positive cash flow if you collect cash faster than you pay bills.
Do I need an accountant to calculate working capital?
No. If you use accounting software like QuickBooks, Xero, or Wave, the balance sheet is generated automatically and you can do the math yourself in minutes. If you use spreadsheets or paper records, you can still calculate it by hand. An accountant is helpful if you are unsure which line items belong in current assets or liabilities, or if you want help interpreting what the number means for your business.
Can working capital be negative and still be okay?
Yes, in some cases. Retail chains and software-as-a-service companies often run on negative working capital because they collect cash from customers before they pay suppliers. However, negative working capital is risky if it is caused by slow customer payments or fast supplier payments you cannot control. Monitor it closely and have a plan to improve it.
How often should I calculate working capital?
Monthly is ideal so you can spot trends and catch problems early. At minimum, calculate it quarterly. Once a year is too infrequent to be useful for managing day-to-day cash.
What should I do if my working capital is negative?
First, identify the cause: Are customers paying late? Are you paying suppliers too early? Is inventory not selling? Once you know the cause, you can fix it—speed up collections, negotiate longer payment terms, or reduce inventory. If negative working capital is structural to your business model, build a cash reserve or a line of credit to cover the gap.