Two retailers post identical net income of $120,000. One earned it on $2 million of equity, the other on $400,000. Same dollars, completely different stories, and the ratio that separates them is the first thing a credit officer reads.
Ratios reduce two giant statements to a handful of numbers a reader can compare across periods and across companies. The exam tests whether you can pick the right ratio for a question prompt, calculate it correctly, and interpret what a moving number reveals about the business.
KEY: Match the ratio to the question. "Can the company pay next month's bills?" is a liquidity question. "Can the company survive a recession?" is a solvency question. "How efficiently are assets generating sales?" is an activity question. Picking the wrong family is the most common trap.
Profitability ratios scale earnings against a base (sales, assets, or equity), so you can compare a small firm with a giant.
Gross profit margin measures pricing power and direct cost control. A retailer with a 40% gross margin keeps $0.40 of every sales dollar before operating expenses.
Common mistakes
- Using ending balance when the ratio calls for an average. ROA, ROE, and turnover ratios use average balances because the denominator is a balance-sheet snapshot compared against a period flow. Using ending equity of $500,000 instead of average $490,000 understates ROE by 0.4 percentage points (19.6% vs 20.0%).
- Forgetting to subtract preferred dividends from ROE numerator. ROE measures the return to common shareholders. With $98,000 net income and $8,000 of preferred dividends, ROE = $90,000 / common equity, not $98,000. Trap: ignoring preferreds inflates ROE.
- Mixing credit and total sales in A/R turnover. Use net credit sales when given. If the question provides total sales of $800,000 with 75% on credit, use $600,000. Trap: using $800,000 understates DSO by inflating turnover.
Bottom line
- Profitability ratios scale earnings to revenue or capital (gross margin, net margin, ROA, ROE, EBITDA margin).
- Liquidity ratios test short-term survival in increasing strictness (current, then quick, then cash).
- Solvency ratios test long-term debt capacity under fixed obligations (debt-to-equity, debt-to-assets, TIE, DSCR).
- Activity (efficiency) ratios convert turnover into days, where cash conversion cycle equals DSO plus days inventory minus days payable.
Exam shortcut
When the question asks which ratio to use, name the family first: liquidity (short-term), solvency (long-term debt), profitability (earnings vs base), activity (efficiency / turnover). Pick the family before the formula and you eliminate two distractors immediately. For ROE questions, run the 3-step DuPont in your head: margin × turnover × leverage. If two firms have the same ROE and one has higher leverage, the higher-leverage firm has weaker operations.
The full lesson (about 4,227 words, 28 min read) adds 2 worked examples, all 6 common mistakes, a self-check, free in the app.
Learning objectives
- I.F1
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