Key points
Working capital = current assets − current liabilities. It measures short-term liquidity, not whether the business model works.
In subscription and credit-based companies, deferred revenue often makes working capital negative. That can signal strength, not distress.
Collecting a prepaid deal does not change working capital. Earning revenue and incurring cost does, so over time it follows gross profit.
Operating working capital, which excludes cash and debt, shows how much cash the business itself ties up or releases.
The usual close errors are missing unbilled usage, late cloud cost accruals, and deferred revenue not split into current and noncurrent.
What working capital measures
Working capital is the gap between what a company can turn into cash within a year and what it must pay within a year. The formula: working capital = current assets − current liabilities. The SEC's beginners' guide frames it as what is left after current assets pay current liabilities.
For a startup, it answers a narrow question. Can the business meet obligations due in the next 12 months from resources it already holds? It does not tell you whether the business model works. Gross margin, burn, and unit economics do that.
Two related measures are often more useful. The current ratio (current assets ÷ current liabilities) shows coverage per dollar owed. Operating working capital removes cash and debt, so you see how much cash the day-to-day business ties up or releases.
What counts as current at a startup
Under US GAAP, an asset is current if it will be realized in cash, sold, or consumed within one year. If the operating cycle is longer, the cycle applies (ASC 210-10-45). Liabilities follow the same logic. Most startups hold no inventory, so the lines that move are not the textbook ones.
Accounts receivable and unbilled usage. Usage delivered but not yet invoiced sits as an unbilled receivable or contract asset. It is current, but less certain than an invoice.
Prepaid expenses. Annual software, insurance, and committed cloud spend paid upfront. See prepaid expenses for how they amortize.
Deferred revenue. Billed or collected amounts for service not yet delivered, including unused credits. Only the portion expected to be earned within 12 months is current. See deferred revenue.
Accrued expenses. Cloud, model API, and payroll costs incurred but not yet billed. See accrued expenses.
Current portion of debt and leases. Venture debt principal due within a year and the current portion of lease liabilities.
Worked example: Fieldnote AI at quarter end
Fieldnote AI is a fictional Series B company with usage-based pricing. Customers buy annual credit packs upfront and draw them down as they run workloads. All figures are illustrative.
Line item | Amount | Side |
|---|---|---|
Cash and cash equivalents | $6,000,000 | Current asset |
Accounts receivable | $1,500,000 | Current asset |
Unbilled usage receivable (contract asset) | $300,000 | Current asset |
Prepaid expenses (annual software, insurance) | $400,000 | Current asset |
Total current assets | $8,200,000 | |
Accounts payable | $700,000 | Current liability |
Accrued expenses (cloud, inference, payroll) | $900,000 | Current liability |
Deferred revenue (prepaid credits, annual plans) | $3,600,000 | Current liability |
Current portion of venture debt | $1,000,000 | Current liability |
Total current liabilities | $6,200,000 |
Working capital = $8,200,000 − $6,200,000 = $2,000,000. The current ratio is $8,200,000 ÷ $6,200,000, about 1.32x.
Now remove cash and the current portion of debt. Operating working capital = ($1,500,000 + $300,000 + $400,000) − ($700,000 + $900,000 + $3,600,000) = −$3,000,000. Customers fund the operating business through prepaid credits. That is a strength, but it reverses quickly if prepayments stop.
How a prepaid credit deal moves working capital
A common surprise for founders: signing and collecting a large prepay does not change working capital. Cash goes up, and so does deferred revenue. Working capital only moves when you earn revenue or incur cost.
Event | Current assets | Current liabilities | Working capital change |
|---|---|---|---|
Invoice a $1,200,000 annual credit prepay | AR +$1,200,000 | Deferred revenue +$1,200,000 | $0 |
Collect the invoice | Cash +$1,200,000, AR −$1,200,000 | No change | $0 |
Customer uses $100,000 of credits | No change | Deferred revenue −$100,000 | +$100,000 |
Accrue $40,000 inference cost for that usage | No change | Accrued expenses +$40,000 | −$40,000 |
The entry when the customer uses $100,000 of credits:
Account | Debit | Credit |
|---|---|---|
Deferred revenue | $100,000 | |
Usage revenue | $100,000 |
The entry for the inference cost behind that usage, which the model provider bills next month:
Account | Debit | Credit |
|---|---|---|
Cost of revenue: inference | $40,000 | |
Accrued expenses | $40,000 |
Net effect: working capital rose $60,000, exactly the gross profit on that usage. Over time, working capital follows profitability while cash follows timing. Confusing the two leads to bad board conversations.
Is negative working capital a problem?
Not by itself. Wikipedia's entry notes that a SaaS company with large deferred revenue can run negative working capital without being in distress. The composition tells you more than the sign.
What you see | Likely meaning | What to check before you worry |
|---|---|---|
Negative working capital, mostly deferred revenue | Customers prepay you. Usually healthy for subscription and credit models. | Renewal pipeline and credit burn rate. If renewals slow, the cushion shrinks fast. |
Negative working capital driven by AP and accruals | Suppliers are being paid late, or costs are outrunning revenue. | AP aging, vendor terms, and gross margin by product. |
Positive working capital, mostly cash from a recent round | Liquidity is fine for now. It says little about the operating model. | Operating working capital without cash and debt, plus cash runway. |
Working capital rising while revenue is flat | Cash is getting stuck in receivables or prepaids. | Days sales outstanding and unbilled usage aging. |
Common mistakes at close and audit
All deferred revenue booked as current. Multi-year prepaid contracts need a current and noncurrent split. Auditors test this against contract terms.
No unbilled usage accrual. If usage is delivered in March and invoiced in April, March working capital is understated without an unbilled receivable.
Cloud and model costs booked when the invoice arrives. Expensing them a month late overstates working capital and gross margin in the same period.
Restricted cash treated as free cash. Cash pledged for a letter of credit on an office lease may not be available. Present and disclose it separately.
Covenants tested on the wrong definition. Venture debt agreements often define working capital or liquidity their own way. Recompute it the lender's way each month.
How to improve working capital: a checklist
Invoice usage in arrears weekly or at a spend threshold, not only at month end.
Offer a discount for annual credit prepayment, and price that discount against your cost of capital.
Move customers to auto-pay and track days sales outstanding by segment.
Ask cloud providers for monthly payment terms on committed spend instead of one upfront prepay.
Review accrued and unbilled balances in every close so the balance sheet is current.
How Quanta handles it
Quanta connects to the usage database, Stripe, Ramp, and cloud bills, and its accounting team keeps the ledger. Unbilled usage, deferred credits, and accrued inference costs are booked in the close, with COGS lines tagged. Finance leads can ask for current working capital in Claude through the Quanta MCP and trace each balance to journal entries.
Quanta perspective
For usage-based and AI companies, the working capital lines to watch are unbilled usage and accrued inference cost, not cash. The gap between them is your gross margin before the invoices arrive. If either balance is a month stale, both working capital and margin are wrong.
Frequently asked questions
What is a good working capital ratio for a startup?
Many guides cite a current ratio of about 1.2x to 2x, but startups with large deferred revenue can run below 1x safely. Look at what drives the ratio, especially deferred revenue and current debt.
Is working capital the same as cash?
No. Cash is one current asset. Working capital also includes receivables, prepaids, payables, accruals, and deferred revenue, so a company can hold a lot of cash and still have thin working capital.
Does deferred revenue reduce working capital?
Yes. The current portion is a current liability. As you deliver the service it becomes revenue, which raises working capital without any cash moving.
What is the difference between working capital and net working capital?
Most sources treat them as the same: current assets minus current liabilities. Some analysts use net working capital to mean the operating version that excludes cash and debt, so confirm the definition.
How do changes in working capital show up in the cash flow statement?
Under the indirect method, changes in operating assets and liabilities adjust net income within operating cash flow. A rise in receivables uses cash, and a rise in deferred revenue provides it.