finance
Working Capital
Current assets minus current liabilities. Money available to fund day-to-day operations.
Definition
Working capital is current assets (cash, receivables, inventory) minus current liabilities (payables, short-term debt). It is the financial cushion that funds day-to-day operations. Positive working capital means you can pay short-term obligations from short-term assets. Negative working capital is dangerous - it means you depend on continuous new cash inflow just to stay current. The working capital ratio (current assets / current liabilities) above 1.5 is healthy; under 1.0 is a warning sign.
The components of working capital in a US small business
Current assets include cash, money market funds, accounts receivable (invoiced but unpaid), inventory, and prepaid expenses (annual SaaS paid upfront, prepaid insurance). Current liabilities include accounts payable (bills not yet paid), accrued expenses (wages, taxes owed), short-term debt due within 12 months, and customer deposits or deferred revenue. The biggest line for most US service businesses is accounts receivable, which can balloon to 60 to 90 days of revenue if collections are weak. For US e-commerce, inventory often dominates. The ratio of these components signals different operating risks.
Growth consumes working capital
Counterintuitive but critical: growth typically destroys cash even for profitable businesses. A US service firm doubling revenue from 500K to 1M needs roughly double the working capital - more AR outstanding, more contractor invoices to pay, more inventory or prepaid tooling. The result: a profitable, growing business can run out of cash and fail. This is why US SBA lenders look at working capital ratios alongside profitability. Solve it by tightening AR cycles (deposits, net 15 terms, automated reminders), extending AP (negotiate net 45 to net 60 with vendors), and maintaining a line of credit as a buffer.
Working capital ratios
Two key ratios. Current ratio = current assets divided by current liabilities. Above 1.5 is healthy; 1.0 to 1.5 is tight; under 1.0 is a serious warning. Quick ratio = (current assets minus inventory) divided by current liabilities. Above 1.0 indicates the business can pay short-term obligations without selling inventory. US lenders also look at days working capital (DWC = working capital divided by daily revenue) - 30 to 60 days is normal for service businesses, 60 to 120 days for product businesses with inventory. Trending ratios matter more than absolute levels.
Negative working capital can be a sign of strength
Some US business models intentionally run negative working capital because customers pay upfront and suppliers are paid later. Amazon famously did this for years - customers paid on credit card immediately, Amazon paid suppliers net 60. Negative working capital here is a sign of pricing power and operational efficiency, not weakness. SaaS with annual upfront billing has the same dynamic: deferred revenue is a current liability that funds operations. Distinguish negative working capital from a strong business model versus a struggling business where AR collections have collapsed. The cash flow statement reveals which it is.
FAQ
Should I include long-term debt in working capital?
No. Working capital uses only current assets and current liabilities (due within 12 months). Long-term debt principal due more than 12 months out sits below the working capital line. However, the current portion of long-term debt (the principal due in the next 12 months) does count as a current liability. US GAAP and IFRS treat this consistently. Banks reviewing your balance sheet will care about both working capital and total debt service capacity.
How much working capital should I keep?
Target 30 to 60 days of operating expenses as working capital reserve for service businesses; 60 to 120 days for product businesses with inventory. A US LLC consulting firm with 100K monthly OpEx should maintain 100K to 200K in working capital. SBA loans and most commercial banks require a minimum debt service coverage ratio that implicitly requires healthy working capital. Below 30 days is fragile; below 15 days is emergency.
Is a line of credit a substitute for working capital?
Partially. An undrawn line of credit functions as backup working capital but is not as reliable. Banks can reduce or cancel lines when financial covenants are breached or when banking conditions tighten (2008, 2023). The conservative position: primary working capital comes from cash on hand; lines of credit are emergency buffer. SBA 7(a) and conventional bank lines of credit in the US typically run 50K to 1M for small businesses and require personal guarantees.
Does working capital include the founder's personal cash?
No, only business-entity cash and assets count for the business balance sheet. Funds in your personal checking, brokerage, or home equity are not working capital, even if you would inject them in a crisis. Investors and lenders look at the business balance sheet as a standalone entity. That said, capacity to inject personal capital is a real backstop that founders should track separately - just not on the working capital line.
How does seasonality affect working capital?
Strongly. Retail businesses peak in Q4 (holiday) and trough in Q1, so working capital needs to grow Q3 to Q4 (building inventory) and contracts Q1 to Q2 (collecting AR, drawing down inventory). Service businesses tied to fiscal year (auditing, tax prep, consulting) have similar swings. Build a 13-week rolling working capital forecast that maps to your seasonal cycle, not just an annual average. The smaller the business, the more seasonality bites.
In your business
- →Track working capital monthly - watch the trend, not just the level
- →If working capital is negative, accelerate receivables before extending payables
- →Growth often consumes working capital - more sales = more receivables tied up