Quick Answer
Liquidity metrics measure the company's ability to meet short-term obligations and convert assets to cash. The exam-relevant set covers the current ratio, the quick ratio (acid test), working capital, the cash collection cycle, three turnover ratios (receivables, inventory, payables), free cash flow yield, debt-to-capital, debt-to-equity, and net debt. Bankers use these across equity, debt, M&A, restructuring, and general advisory work.
The first analytical pass after building the financial statements is: can this company pay its bills? Liquidity metrics answer that question.
The Two Core Liquidity Ratios
The current ratio and the quick ratio are the most heavily tested liquidity comparisons.
| Ratio | Formula | What It Measures |
|---|---|---|
| Current ratio (working capital ratio) | Current assets / current liabilities | Ability to pay short-term obligations using all current assets |
| Quick ratio (acid test) | (Current assets minus inventory) / current liabilities | Same idea, but excludes inventory |
- A current ratio above 1.0 means current assets exceed current liabilities (positive working capital)
- The quick ratio is the tougher test because inventory is the least liquid current asset (may not sell quickly, may sell at a markdown)
Think of it this way: The current ratio asks "if I had to settle short-term obligations using everything I could plausibly turn into cash within a year, could I cover it?" The quick ratio asks the same question but pretends inventory is worthless until proven otherwise.
Exam Tip: Gotchas
- Current ratio includes inventory; quick ratio strips it out. For inventory-light or distressed companies, the quick ratio is the tougher liquidity test. The exam frequently tests this distinction.
- Working capital is a dollar amount, not a ratio. Working capital = current assets minus current liabilities. The current ratio is the same idea expressed as a ratio.
Cash Collection Cycle and Turnover Ratios
The cash collection cycle measures how many days the company's cash is tied up in operations before it comes back as cash from customers.
Cash collection cycle = DIO + DSO − DPO, where:
- DIO = days inventory outstanding (how long inventory sits before it sells)
- DSO = days sales outstanding (how long customer invoices sit before they pay)
- DPO = days payables outstanding (how long the company sits on supplier invoices before paying)
A shorter cycle means cash recycles faster through the business.
The three turnover ratios measure the same activity from a different angle.
| Turnover Ratio | Formula | What Faster Means |
|---|---|---|
| Receivables turnover | Revenue / accounts receivable | Customers pay faster |
| Inventory turnover | COGS / inventory | Inventory sells faster |
| Payables turnover | COGS / accounts payable | Company pays suppliers faster |
Exam Tip: Gotchas
- Receivables turnover uses revenue; inventory and payables turnover use COGS. The mismatch is intentional: receivables come from billed sales (revenue dollars), while inventory and payables are tied to the cost of producing what's sold (COGS dollars).
Capital Structure Liquidity Metrics
Bankers also measure liquidity at the capital-structure level.
- Cash flow: Absolute cash generated, often measured as operating cash flow (CFO)
- Debt-to-capital: Total debt (or long-term debt) divided by debt plus equity
- Debt-to-equity: Total debt (or long-term debt) divided by equity
- Free cash flow yield: Free cash flow divided by market cap
- Net debt: Total debt minus cash and equivalents
Net debt is one of the most commonly used metrics in investment banking because it strips out balance-sheet cash that could be used to retire debt overnight.
Exam Tip: Gotchas
- Net debt subtracts cash. A company with $5 billion of debt and $4 billion of cash has $1 billion of net debt, not $5 billion. Net debt is what shows up inside the enterprise value formula in the next valuation section.
- Free cash flow yield uses market cap (equity), not enterprise value. The yield concept is "FCF per dollar of stock you bought," so the denominator is equity.