Working Capital Explained: Why Profitable Companies Still Run Out of Cash
Blog › Finance · 9 min read · Published 2026-05-07
How working capital, current ratio and the cash conversion cycle determine whether your business survives the next 12 months.
The Profitable-but-Broke Paradox
A growing business can show record profits and still miss payroll. The reason: profit is an accounting concept; cash is reality. Working capital — the gap between current assets and current liabilities — is the buffer that keeps you solvent until customers pay. The Working Capital Calculator measures it instantly.
The Three Liquidity Ratios
Current Ratio = CA ÷ CL (target 1.5–3). Quick Ratio = (CA − Inventory) ÷ CL (target ≥ 1). Cash Ratio = (Cash + Securities) ÷ CL (target ≥ 0.3). Each strips out a layer of optimism.
The Cash Conversion Cycle
CCC = DSO + DIO − DPO. Days Sales Outstanding (how long customers take to pay) plus Days Inventory Outstanding (how long stock sits) minus Days Payable Outstanding (how long you wait to pay suppliers). A 60-day CCC means every dollar of growth ties up cash for two months. Amazon's CCC is famously negative — suppliers fund their growth.
Why Growth Eats Cash
Doubling revenue often means doubling inventory and receivables before the new sales bring cash in. Many failed startups died not from low margins but from undercapitalised growth. Plan working-capital needs into your fundraising.
Industry Norms
SaaS: low working capital needs (no inventory, prepaid contracts). Retail: medium (inventory-heavy). Manufacturing: high (raw materials + WIP + finished goods). Construction: extremely high (long projects, slow billing).
Levers That Free Cash
- Tighten DSO — invoice immediately, accept cards, automate dunning.
- Stretch DPO — negotiate net-60 with suppliers (without souring relationships).
- Reduce DIO — see our Inventory Turnover guide.
- Refinance short-term debt to long-term where rates allow.
- Factor receivables for fast cash (at a cost).
Bottom Line
Profit is an opinion; cash is a fact. Track your working capital and current ratio monthly. The day you can't make payroll, no spreadsheet will save you.