Quick Ratio vs Current Ratio — When to Use Each
The current ratio includes inventory; the quick ratio excludes it. For businesses where inventory is highly liquid (fast-moving consumer goods), the current ratio is appropriate. For businesses with slow-moving or seasonal inventory (manufacturing, retail), the quick ratio gives a more realistic liquidity picture.
For SaaS and services companies with no inventory, the two ratios are identical. The quick ratio is the standard liquidity test for manufacturing, retail, and distribution businesses where inventory quality and liquidity vary significantly.
The Acid Test Origin
The term "acid test" comes from the gold rush era — miners would test gold's purity by applying acid. Impure gold would dissolve; pure gold wouldn't. The acid test ratio applies a similar discipline to liquidity: strip out the assets (inventory) that might not hold value under pressure, and see what remains. If quick assets cover current liabilities, the business passes the acid test.
Quick Ratio in Lending and M&A
Banks and lenders often use the quick ratio as a covenant measure, particularly for asset-based lending and revolving credit facilities. A common covenant requires maintaining a quick ratio above 1.0× or 1.2×. Falling below the covenant threshold can trigger default provisions.
In M&A due diligence, buyers assess the quick ratio to understand actual near-term cash risks. A target company with a strong current ratio but weak quick ratio may have overvalued or illiquid inventory — a potential write-down risk post-acquisition.
1.0×+
Minimum quick ratio target
1.2×
Common lender covenant minimum
AR days
Review AR days to assess collection risk
Cash
Cash ratio = strictest test (cash + STI only)