The working capital formula is current assets − current liabilities. It is also called the net working capital formula. For a US small or midsize business, the result shows whether short-term resources cover short-term obligations — but it is a balance-sheet snapshot, not a cash plan. Operating working capital is a related, narrower measure that normally excludes cash and interest-bearing debt. This guide calculates both without mixing their definitions.
Quick answer
Net working capital = current assets − current liabilities. A positive result means the business holds more short-term resources than short-term obligations; a negative result means it depends on timing, supplier credit, or outside cash to pay bills on schedule.
Operating working capital = non-cash operating current assets − non-debt operating current liabilities. A common simplified equation is accounts receivable + inventory − accounts payable, but companies may also include other operating current assets and accrued operating liabilities. State the included accounts whenever you use this version.
To act on the number: calculate working capital from your latest balance sheet, estimate the operating need from your cash conversion cycle, then decide whether the gap is a process problem (billing, inventory, payment terms) or a financing problem. For the broader strategic-finance picture behind these decisions, see our Remote CFO services hub.
What is the working capital formula?
The US Securities and Exchange Commission’s beginner’s guide to financial statements states the formula directly — Working Capital = Current Assets − Current Liabilities — and defines the result:
“Working capital is the money leftover if a company paid its current liabilities … from its current assets.” — U.S. Securities and Exchange Commission
The two inputs come from the balance sheet:
- Current assets are resources the business expects to convert to cash within one year — typically cash, short-term investments, accounts receivable (AR, money customers owe you), inventory, and prepaid expenses.
- Current liabilities are obligations due within one year — typically accounts payable (AP, money you owe suppliers), accrued wages and taxes, customer deposits, the current portion of long-term debt, and balances on short-term credit lines.
You will also see the same figure called net working capital. A related measure, the working capital ratio (also called the current ratio), divides instead of subtracts: current assets ÷ current liabilities. The SEC notes that desirable ratios vary by industry, so there is no single benchmark every US business should hit.
One basis caveat matters for small businesses. The formula assumes accrual-basis books that record receivables and payables. IRS Publication 538 distinguishes the two accounting methods:
“Under the accrual method, you generally report income in the tax year you earn it, regardless of when payment is received.” — Internal Revenue Service
Under the cash method, income and expenses are recorded when money moves, so a cash-basis tax workpaper may not show AR or AP at all. If your tax return is cash-basis, calculate working capital from an accrual-style management balance sheet — the same presentation US GAAP (generally accepted accounting principles) financial statements use — rather than from tax figures alone.
Net working capital vs. operating working capital
The terms answer different questions. Net working capital measures balance-sheet liquidity. Operating working capital isolates the short-term accounts tied more directly to selling, delivering, collecting, and paying suppliers.
| Measure | Common formula | What it answers |
|---|---|---|
| Net working capital | Current assets − current liabilities | Can short-term resources cover short-term obligations? |
| Operating or non-cash working capital | Non-cash current assets − non-debt current liabilities | How much short-term capital is tied up in operations? |
| Simplified operating working capital | Accounts receivable + inventory − accounts payable | How much cash is tied up in the core customer, inventory, and supplier cycle? |
| Total operating capital | Operating working capital + net operating long-term assets | How much capital supports both short- and long-term operations? |
Operating working capital and total operating capital are management or valuation measures, not standardized US GAAP subtotals. Definitions vary by company. NYU Stern’s financial-measure definitions use non-cash current assets minus non-debt current liabilities; some companies use a narrower receivables-plus-inventory-minus-trade-payables definition. Reconcile the formula to the named balance-sheet accounts before comparing businesses.
How do you calculate working capital from a balance sheet?
Here is a complete worked example. Harborline Building Supply LLC is a hypothetical US distributor; every figure is made up for illustration.
Hypothetical illustration: current section of Harborline’s balance sheet, June 30, 2026 (USD)
| Balance-sheet line item | Amount |
|---|---|
| Cash and cash equivalents | $85,000 |
| Accounts receivable | $120,000 |
| Inventory | $95,000 |
| Prepaid expenses | $10,000 |
| Total current assets | $310,000 |
| Accounts payable | $90,000 |
| Accrued payroll and payroll taxes | $25,000 |
| Current portion of long-term debt | $30,000 |
| Revolving credit line balance | $40,000 |
| Total current liabilities | $185,000 |
Working capital = $310,000 − $185,000 = $125,000. The working capital ratio = $310,000 ÷ $185,000 ≈ 1.68. Harborline holds about $1.68 of short-term resources for every $1.00 of short-term obligations — a cushion on paper, but one that says nothing yet about timing.
If any of these line items are unfamiliar, our business owner’s guide to decoding financial statements walks through the balance sheet and its companion statements line by line.
How much working capital does your business need?
The snapshot answers “where do we stand?” It does not answer “is that enough?” A practical estimate of operating need starts with the cash conversion cycle (CCC) — the number of days between paying for costs and collecting the related revenue:
- Days inventory outstanding (DIO) = (inventory ÷ annual cost of goods sold) × 365 — how long stock sits before sale.
- Days sales outstanding (DSO) = (accounts receivable ÷ annual revenue) × 365 — how long customers take to pay.
- Days payables outstanding (DPO) = (accounts payable ÷ annual cost of goods sold) × 365 — how long you take to pay suppliers.
- CCC = DIO + DSO − DPO. Suppliers effectively finance the DPO portion of your cycle.
Then: estimated operating funding need ≈ annual cash operating costs × (CCC ÷ 365). This planning estimate is not the same as the operating working capital balance defined above. Continuing the hypothetical Harborline example, assume annual revenue of $1,800,000, annual cost of goods sold (COGS) of $1,080,000, and annual cash operating expenses of $540,000.
Hypothetical illustration: Harborline’s operating-cycle estimate (365-day year, USD)
| Step | Formula | Harborline inputs | Result |
|---|---|---|---|
| Days inventory outstanding | (Inventory ÷ COGS) × 365 | ($95,000 ÷ $1,080,000) × 365 | 32.1 days |
| Days sales outstanding | (AR ÷ revenue) × 365 | ($120,000 ÷ $1,800,000) × 365 | 24.3 days |
| Days payables outstanding | (AP ÷ COGS) × 365 | ($90,000 ÷ $1,080,000) × 365 | 30.4 days |
| Cash conversion cycle | DIO + DSO − DPO | 32.1 + 24.3 − 30.4 | 26.0 days |
| Estimated operating funding need | (COGS + operating expenses) × (CCC ÷ 365) | $1,620,000 × (26.0 ÷ 365) | ≈ $115,400 |
Harborline’s $125,000 of balance-sheet working capital covers the modeled need of roughly $115,400 with a cushion of about $9,600. Two cautions follow. First, this is a planning estimate, not a GAAP measure — seasonality, customer concentration, retainage, or progress billing can stretch the real cycle well beyond the averages. Pure service businesses have little inventory, so their cycle is driven almost entirely by DSO. Second, growth consumes working capital: if Harborline’s revenue grew 20% with the same cycle, the need would scale to roughly $138,500 — more than today’s $125,000 snapshot. Profitable growth can still squeeze cash.
A snapshot and a cycle estimate are still not a week-by-week cash plan. To see which specific weeks cash runs short, build the near-term view with our free 13-week cash flow template.
Is positive or negative working capital better?
Positive working capital means the business can, on paper, pay its short-term obligations from short-term resources. But more is not always better: a very large balance can signal idle cash, slow-moving inventory, or lax collections rather than strength. Negative working capital means current liabilities exceed current assets. Some businesses run negative working capital by design because they collect from customers before paying suppliers; for most US small and midsize businesses with slow-paying business customers, though, a persistent negative position means depending on supplier patience, a credit line, or new borrowing to meet payroll and rent.
Liquidity pressure of this kind is common. In the Federal Reserve Banks’ 2025 Report on Employer Firms, drawn from the 2024 Small Business Credit Survey (SBCS) of 7,653 US employer firms fielded September through November 2024:
“More than half of firms cited paying operating expenses (56%) or uneven cash flows (51%) as challenges.” — Federal Reserve Banks, 2025 Report on Employer Firms
The same report found 75% of firms cited rising costs of goods, services, or wages as a financial challenge — the most common one reported. These are survey results from a nationwide convenience sample, not predictions for your business; they simply show that managing the gap between costs and collections is a mainstream problem, not a personal failure.
Should you finance the gap or fix the process?
This is the decision that matters most, and the formula alone cannot make it. Compare the snapshot with the cycle estimate, then identify the driver.
Match the response to the cause of the working-capital gap, not just its size
| What you observe | Likely driver | Process response | When financing fits |
|---|---|---|---|
| Invoices go out days or weeks late; no reminder cadence | Collections process | Same-day invoicing, deposits, automated follow-up | Rarely — fix billing first |
| Inventory sits 60+ days while suppliers want payment in 30 | Inventory and terms mismatch | Tighter purchasing, inventory-turn targets, renegotiated terms | Seasonal build ahead of a selling season |
| Customers pay on net-60 terms but payroll runs every two weeks | Structural timing gap | Milestone billing or partial upfront payment | A revolving line of credit to bridge contracted terms |
| Sales growing 20%+ with an unchanged cycle | Growth consuming cash | Forecast the added need before committing to it | A line or term loan sized to the incremental need |
| Shortfall persists even at zero growth | Margin or overhead problem | Pricing and cost review | Financing buys time only — the deficit itself must be addressed |
When overdue invoices are part of the gap, review an accounts receivable aging report before adding financing.
The pattern: shorten DSO, DIO, or stretch DPO where process allows, and reserve financing for timing gaps and growth that process cannot close. Financing adds a repayment obligation — often to current liabilities — so it funds the gap rather than shrinking it.
On the financing side, federal options exist for exactly this purpose. The US Small Business Administration (SBA) states that its core 7(a) loan program, with a maximum loan amount of $5 million, can be used for short- and long-term working capital. Its 7(a) Working Capital Pilot program offers asset-based and transaction-based credit lines and, per an SBA announcement, had delivered more than $150 million in lending as of February 2026. Demand is real: in the 2024 SBCS, 37% of employer firms applied for a loan, line of credit, or merchant cash advance in the prior 12 months, and 56% of applicants sought financing to meet operating expenses. Program terms change, and these programs are federal while financing contracts themselves are generally governed by state law — confirm current terms with lenders and advisors, and treat no application as guaranteed approval.
FAQs
Is working capital the same as cash flow?
No. Working capital is a point-in-time balance-sheet measure. Cash flow is the movement of money over a period, which is why a cash flow statement and a 13-week forecast answer different questions than a balance-sheet ratio.
What is the operating working capital formula?
A common formula is non-cash operating current assets minus non-debt operating current liabilities. For a simple product business, that is often accounts receivable + inventory − accounts payable. Include other operating accounts only when the definition is stated consistently, and do not treat operating working capital as a synonym for total current assets minus total current liabilities.
What is a good working capital ratio for a small business?
There is no universal benchmark — the SEC notes that desirable ratios vary by industry. A ratio below 1.0 means current liabilities exceed current assets. More useful than any external target is your own trend measured the same way each month, compared against your cash conversion cycle.
Can a profitable business have negative working capital?
Yes. Profit is an income-statement result; if receivables and inventory grow faster than payables, a profitable business can still run short of cash. The reverse design also exists — businesses that collect before paying suppliers can operate with negative working capital by intent.
Does long-term debt count in the working capital formula?
Only the current portion — the principal due within twelve months of the balance-sheet date — counts as a current liability. The remainder is a long-term liability and stays outside the formula.
How often should you recalculate working capital?
Compute the balance-sheet figure at every monthly close, refresh the operating-cycle estimate quarterly or after any change in terms or sales volume, and redo both before committing to a large inventory build, a big contract, or a new credit facility.
Put the formula to work
Pull your latest accrual-basis balance sheet, calculate working capital and the ratio, estimate your operating need from the cash conversion cycle, and then decide whether the gap calls for a process fix, financing, or both. If you would rather have a senior finance team run that assessment with you — clean accrual books, a cycle model, and the forecast behind it — have our remote CFO team assess your working capital position.
Program details and survey figures in this article were checked against the linked SBA, Federal Reserve, IRS, and SEC pages on July 27, 2026. This article is general educational information for US small and midsize businesses, not tax, legal, accounting, or lending advice. Working-capital decisions depend on your contracts, industry, and state; consult qualified advisors who know your situation before acting.