What Is Working Capital? Formula and Small Business Example
Working capital is what a business would have left if it paid off every near-term bill using only its near-term assets. The formula is short: current assets minus current liabilities. It measures whether you can cover the next twelve months of obligations without borrowing or selling equipment, and it explains a problem that puzzles a lot of owners: how a business can be profitable on paper and still run out of cash.
What working capital is
The Securities and Exchange Commission defines working capital as "the money leftover if a company paid its current liabilities (that is, its debts due within one-year of the date of the balance sheet) from its current assets" (SEC, Beginners' Guide to Financial Statements). Both halves come straight off the balance sheet.
The two ingredients are the current lines:
- Current assets are, in the SEC's words, "things a company expects to convert to cash within one year." Cash in the bank, money customers still owe you (accounts receivable), inventory you plan to sell, and prepaid expenses like insurance paid ahead.
- Current liabilities are "obligations a company expects to pay off within the year." Unpaid supplier bills (accounts payable), a credit card balance, the portion of a loan due in the next twelve months, sales tax and payroll taxes owed.
Anything that takes longer than a year sits outside the calculation. A five-year equipment loan, a delivery van, the building you own: none of it counts, because working capital is only about the near term.
The working capital formula
The SEC states it as one line:
Working Capital = Current Assets − Current Liabilities
The sign tells the story. Positive working capital means your current assets are larger than your current bills, so you can meet the next year's obligations from what is already on hand or about to turn into cash. Negative working capital means the opposite: more falls due within the year than you have current assets to cover, and the gap has to come from new sales, an owner contribution, or a loan.
Positive is not automatically safe and negative is not automatically fatal. A restaurant that collects cash the moment it serves a meal but pays suppliers on 30-day terms often runs on slim or negative working capital and does fine, because cash arrives before the bills land. The number is a starting question, not a verdict.
A worked example
Maria runs a coffee-supply shop as a sole proprietor. Here are her current lines on December 31.
| Current accounts | Amount |
|---|---|
| Current assets | |
| Cash (checking account) | $8,000 |
| Accounts receivable | $6,000 |
| Inventory | $10,000 |
| Total current assets | $24,000 |
| Current liabilities | |
| Accounts payable | $9,000 |
| Credit card balance | $2,000 |
| Loan payments due within a year | $3,000 |
| Total current liabilities | $14,000 |
Her working capital is $24,000 − $14,000 = $10,000. If every bill due in the next year arrived at once, Maria could pay all of it from cash, collections, and sold inventory and still have $10,000 to spare. That cushion is what keeps a slow month from turning into a missed payment.
Notice what is missing. Maria's van and her three-year equipment loan do not appear, because neither is current. Working capital deliberately ignores the long-term side of the balance sheet to isolate one question: can the business get through the year?
The current ratio and the quick ratio
The same two numbers give you two ratios that lenders read before they read anything else.
The current ratio is current assets divided by current liabilities. Maria's is $24,000 ÷ $14,000 = 1.71, meaning she holds $1.71 of current assets for every $1 of current bills. Above 1 says current assets exceed current liabilities; below 1 says they do not.
The quick ratio strips out inventory, on the logic that inventory can be slow or hard to sell for full price. It is (current assets − inventory) ÷ current liabilities. Maria's is ($24,000 − $10,000) ÷ $14,000 = 1.0, exactly break-even. The two ratios together tell a sharper story than either alone: her 1.71 current ratio looks comfortable, but once you set the coffee stock aside, she has just enough liquid assets to cover her bills and no more. If that inventory moves slowly, the quick ratio is the truer picture.
| Metric | Formula | Maria |
|---|---|---|
| Working capital | Current assets − current liabilities | $10,000 |
| Current ratio | Current assets ÷ current liabilities | 1.71 |
| Quick ratio | (Current assets − inventory) ÷ current liabilities | 1.0 |
Why a profitable business can still run short
Working capital is where profit and cash part ways. You can book a sale, record the profit, and wait 45 days for the customer to pay, all while rent and suppliers come due now. That timing gap is the reason a growing, profitable business can still miss payroll, and it is the same gap the difference between cash flow and profit describes.
The gap has a name: the cash conversion cycle. Cash goes out to buy inventory, the inventory sits before it sells, the sale becomes a receivable, and only when the customer pays does cash come back. Suppose Maria's inventory sits 40 days before selling, her customers take 30 days to pay, and her own suppliers give her 30 days. Her cycle is 40 + 30 − 30 = 40 days: cash leaves her account about 40 days before it returns. The longer that cycle, the more working capital the business has to keep on hand just to bridge it, which is why fast growth often demands more cash rather than less.
How to improve your working capital
Every lever below either speeds cash in or slows cash out, without touching your profit.
- Collect receivables faster. Invoice the day the work is done, set clear due dates, and follow up the moment a payment is late. Every day you shorten collection is a day less cash tied up in accounts receivable.
- Use supplier terms fully. If a supplier offers 30 days, paying on day 30 rather than day 5 keeps cash in your account longer at no cost. Do not pay early unless there is a discount worth more than the cash.
- Right-size inventory. Stock that sits is cash frozen on a shelf. Order to demand instead of to a shelf you want to look full.
- Match financing to the need. For a short, recurring gap, a revolving line of credit fits better than a term loan: the SBA notes that "unlike traditional business loans, which have a fixed monthly payment and repayment term, a revolving line of credit is open indefinitely" (SBA, 3 Ways to Get Working Capital). The same guidance adds a caution worth heeding: "the ability to service debt is a key factor when a business needs to raise additional working capital."
None of these change whether the business is profitable. They change whether the cash is there when a bill is.
Common misconceptions about working capital
The more working capital, the better. Not quite. A pile of idle cash and a warehouse of unsold inventory both raise working capital while earning nothing. Very high working capital can mean money is trapped in slow inventory or uncollected invoices instead of working for the business.
Working capital is the same as cash. It is not. Maria's $10,000 of working capital includes $6,000 she cannot spend until customers pay and $10,000 of coffee she has not sold. Cash is one current asset among several, and the difference between the two is exactly what the quick ratio is trying to expose.
It only matters to big companies. A sole proprietor with one slow-paying client and a supplier bill due Friday is living the working capital problem in miniature. The smaller the business, the less cushion there is to absorb a timing gap.
Frequently asked questions
What is the working capital formula? Working capital equals current assets minus current liabilities. Current assets are what you expect to turn into cash within a year; current liabilities are what you expect to pay within a year.
What is a good working capital ratio? The current ratio (current assets ÷ current liabilities) sits above 1 when current assets exceed current bills. What counts as healthy depends on the industry and how fast your inventory and receivables turn into cash, so read it alongside the quick ratio rather than against a single target.
Can working capital be negative? Yes. Negative working capital means more falls due within the year than you hold in current assets. It is a warning sign for most businesses, though some that collect cash before they pay suppliers run on it by design.
What is the difference between working capital and cash flow? Working capital is a snapshot from the balance sheet on one date. Cash flow tracks the actual movement of money in and out over a period. Working capital tells you the cushion you have; cash flow tells you how it is changing.
Does profit increase working capital? Profit that comes in as cash or collectible receivables raises working capital. Profit tied up in a new machine or a long-term asset does not, which is how a profitable year can still leave you short on near-term cash.
Key takeaways
- Working capital is current assets minus current liabilities: what a business would have left after paying every bill due within a year from its near-term assets.
- The sign is the signal. Positive means current assets cover near-term bills; negative means they do not, and the gap must come from sales, an owner, or a lender.
- Read the current ratio and the quick ratio together. Stripping out inventory often turns a comfortable-looking current ratio into a tighter quick ratio, which is the truer test of liquidity.
- Profit and cash are not the same. The cash conversion cycle means a profitable business can still run short while it waits for receivables to come in.
- You improve working capital by timing, not by profit: collect faster, use supplier terms fully, right-size inventory, and match short gaps to a line of credit.
Working capital is only as accurate as the records the balance sheet is built from: every bill logged, every payment captured, every dollar of income tracked. Capture expenses and bills as they happen with an expense tracker and keep income in the same place with an income tracker, then publish clean, categorized records to QuickBooks Online or Xero, which assemble the balance sheet your working capital comes from. Get Started with SparkReceipt to keep the numbers behind your current accounts current.