What is working capital?
Working capital is the amount by which a company's current assets exceed its current liabilities, and it shows what is left after debts due within a year. So the answer to what is working capital on your own books sits in two subtotals on your balance sheet.
The SEC's beginners' guide to financial statements puts it in plain terms. Working capital is the money left over if a company paid its current liabilities from its current assets. That is a test of one date, not a forecast.
You may have met the term in your financial reports or in a conversation about a loan. Operating expenses are a common reason to look for outside money: 56% of employer firms that sought financing did so to meet them, per the 2026 Report on Employer Firms from the Small Business Credit Survey.
This page explains the number itself: the formula, how to read it and why debt moves it in different ways. Sizing a gap against your cash cycle and paying for it are separate questions, covered in our guide to working capital loans.
Commera is a broker, not a lender. We compare offers from our lender partners.
How do you calculate working capital?
Working capital equals current assets minus current liabilities, the formula given in the SEC's beginners' guide. Knowing how to calculate working capital takes one balance sheet and one subtraction.
`Working capital = Current assets - Current liabilities`
The hard part is sorting the lines. The SEC guide gives the test. Current assets are things a company expects to convert to cash within one year. Current liabilities are obligations it expects to pay off within the year.
Regulation S-X, Rule 5-02, the SEC's rule on balance sheet line items, shows what usually lands on each side:
- Current assets: cash and cash items, marketable securities, accounts and notes receivable, inventories, prepaid expenses and other current assets.
- Current liabilities: accounts and notes payable, plus other current liabilities such as accrued payroll, accrued interest, taxes and the current portion of long-term debt.
Watch that last item. A long-term loan is not all long-term. The part due in the next year counts as a current liability, so split the balance before you add it up.
Three steps get you the number:
- Pick one balance sheet date and use it for both sides.
- Add up the lines that pass the one-year test on each side.
- Subtract current liabilities from current assets.
A negative result is still a valid result, and it means the liabilities side is larger.
Working capital is easy to confuse with two other numbers on your statements. They answer different questions, and the SEC guide separates them by statement. The balance sheet is a snapshot at the end of a period. The income statement reports earnings or losses over a period, and the cash flow statement tells you whether the company generated cash.
| Measure | What it shows | Where it comes from | What it misses |
|---|---|---|---|
| Working capital | Current assets left after current liabilities, on one date | Balance sheet | Whether those assets have turned into money yet |
| Cash | Money the business holds now | Balance sheet cash line, with movements on the cash flow statement | Invoices coming in and bills coming due |
| Profit | What the business earned or lost over a period | Income statement | Whether the sales have been collected |
Profit is not cash. Cash is not working capital. Keep all three in view.
Worked example: calculating working capital from a balance sheet
Working capital from a balance sheet takes two subtotals and one subtraction. The table below runs that subtraction for an assumed HVAC contractor, line by line, so you can copy the layout for your own numbers.
Methodology: Commera illustrative calculation. The HVAC contractor and every amount are assumptions. This is not an offer and not a real deal.
| Line | Amount, $ |
|---|---|
| Cash | 85,000 |
| Accounts receivable | 240,000 |
| Inventory | 60,000 |
| Prepaid expenses | 15,000 |
| Total current assets | 400,000 |
| Accounts payable | 110,000 |
| Accrued payroll and taxes | 45,000 |
| Line of credit balance | 60,000 |
| Current portion of long-term debt | 35,000 |
| Total current liabilities | 250,000 |
| Working capital | 150,000 |
Two ratios come from the same balance sheet, and both are shown here as definitions used in this Commera calculation.
Current ratio is total current assets divided by total current liabilities. Here it comes to 1.60.
Quick ratio is cash plus accounts receivable, divided by total current liabilities. Here it comes to 1.30. Inventory and prepaid expenses stay out of it, so it asks a harder question: what if the stock does not sell soon?
The dollar figure tells you the size of the cushion. The ratios tell you its size relative to what is due. Check both, because the same dollar amount reads differently at a larger or smaller business.
What does low or negative working capital mean?
Low working capital means a thin margin between what should turn into cash within a year and what is due in that time. Negative working capital means current liabilities are larger than current assets, so those assets would not cover those debts even if every one converted on schedule.
Neither reading is a verdict by itself. There is no single good number. The SEC guide notes that, as a general rule, desirable ratios vary by industry. Your operating cycle matters too.
A business paid at the register has fewer receivables to count than a contractor billing after each job. Be wary of any fixed target that ignores this.
A positive figure is not cash in the bank. Receivables and inventory are not money yet. In the Commera illustrative calculation above, the contractor's cash of $85,000 would not cover its current liabilities alone. The rest depends on customers paying and stock selling.
So read the lines, not just the total:
- Is the gap in receivables? Customers may be paying late. If unpaid invoices are what is holding cash back, invoice factoring is one way to turn them into money sooner.
- Is the gap in inventory? Stock that sits on the shelf still counts as a current asset. Ask how much of it would really sell within the year.
- Is the gap in current debt? A large current portion of long-term debt or a full line of credit can pull the figure down. Check what falls due, and when.
Compare the same calculation across several balance sheet dates as well. A single low reading says less than a figure that keeps falling.
Worked example: how financing changes working capital
Financing changes working capital only through the amounts that land in current assets and current liabilities. Four decisions of the same size, made from the same balance sheet, can therefore produce four different results. None of them raises the figure by the full amount.
Methodology: Commera illustrative calculation, an accounting illustration, not financing terms, starting from the balance sheet in the first worked example and showing only the day of the transaction. Each decision involves $100,000, with interest and fees excluded, and the line balance is due within a year. The three-year loan repays principal in equal shares, so $33,333 falls within the next 12 months. This is not an offer and not a real deal.
| Decision | Current assets, $ | Current liabilities, $ | Working capital, $ | Change, $ | Current ratio |
|---|---|---|---|---|---|
| Starting point | 400,000 | 250,000 | 150,000 | 0 | 1.60 |
| Draw $100,000 on a line due within a year, hold cash | 500,000 | 350,000 | 150,000 | 0 | 1.43 |
| Three-year loan, hold cash | 500,000 | 283,333 | 216,667 | +66,667 | 1.76 |
| Three-year loan, buy a machine | 400,000 | 283,333 | 116,667 | -33,333 | 1.41 |
| Pay cash for the machine | 300,000 | 250,000 | 50,000 | -100,000 | 1.20 |
Each row follows from the formula:
- Line of credit, hold cash. Cash and current debt rise by the same amount, so the figure stays put. The business has more cash, yet the current ratio falls to 1.43.
- Three-year loan, hold cash. All of the cash is current, but only the next year's principal is. The rest sits outside the formula, so this Commera illustrative calculation shows a rise of $66,667.
- Three-year loan, buy a machine. The cash comes in and leaves again as a long-lived asset. The current share of the debt stays, so the figure falls.
- Pay cash for the machine. Cash drops and no liability changes. The figure falls by the full price.
The takeaway fits in three lines. Debt due within a year does not raise working capital. A longer loan raises it by the share due beyond a year. Buying equipment reduces it.
The gain from a longer loan also fades. As the loan ages, later principal moves into current liabilities.
A table like this one says nothing about what any loan costs. It tracks one balance sheet figure, and cost is a separate calculation. To see that side of a decision, estimate a payment with your own numbers.
How can a business improve working capital?
A business improves working capital by turning current assets into cash sooner, stretching what it owes where suppliers agree, and paying for long-lived assets with long-lived money. Some of these moves change the total. Others change only its quality, which still matters when bills come due.
Use this working capital review against your own balance sheet:
- Collect invoices faster. Bill promptly and follow up on late accounts. Collecting moves money from receivables to cash, so the total stays the same, but the cushion becomes real money.
- Hold less slow stock. Find what has sat longest and sell it down. Fewer dollars stay tied up on the shelf, and your inventory line says more about what can actually sell.
- Talk to suppliers about terms. Ask for longer payment terms before cash gets tight. The payable stays on the books, but the cash stays in your account longer.
- Do not pay cash for a long-lived asset by default. The last row of the table above shows why. Check the balance sheet effect before you write the check.
- Match the debt term to the asset. A short balance against a long-lived machine sits fully in current liabilities. A term closer to the asset's useful life leaves more of the debt outside the formula.
Short-term borrowing has its place. A business line of credit can bridge a short gap, but as the worked example shows, the draw itself leaves working capital flat. When a long-lived purchase needs financing, you can compare business loan options on our product page. Cost and terms depend on the provider and on underwriting.
Broker disclosure: Commera Finance is a broker, not a direct lender. Financing providers make their own eligibility, underwriting, approval, pricing, and term decisions.
Sources