Z-score (Altman Z) Comprehensive Guide

1. What is Z-score (Altman Z)?

The Altman Z-score is a brutally accurate financial stress-test formula predicting the statistical likelihood that a publicly traded manufacturing firm will catastrophic default and go violently bankrupt within the next 24 months.

2. How it Works & Calculation

$Z = 1.2X_1 + 1.4X_2 + 3.3X_3 + 0.6X_4 + 1.0X_5$ It aggressively weights 5 critical ratios (Working Capital, Retained Earnings, EBIT, Market Cap vs Debt, Sales vs Assets). Z < 1.8 indicates imminent distress and likely bankruptcy.

3. Why it Matters & Use Cases

It pierces through superficial corporate PR spin. Unprofitable companies can fake growth for years, but the Z-score mathematically exposes the rotting financial architecture underneath before the collapse happens.

4. Practical Example

In 2008, analysts ran the Z-score on General Motors exactly months prior to their catastrophic failure. Its Z-score had silently plummeted to 1.1—firmly in the 'Distress Zone'—despite GM claiming strong sales momentum.

5. Comparisons & Limitations

Z-score vs. Current Ratio

• Z-score: A predictive, incredibly comprehensive multivariable deep-dive stress test.
• Current Ratio: A shallow, isolated snapshot of just short-term liquidity.