Cost of Goods Sold (COGS) represents the direct costs incurred to manufacture a product or deliver a service. These costs vary with production or sales volume and exclude indirect operating expenses such as marketing, administration, and finance costs.

Gross Profit = Revenue − COGS
Gross Margin = Gross Profit / Revenue

Gross Profit is arguably the most important measure of operating profitability, as it reflects the economics of the company’s core business before indirect operating expenses.

Components of COGS

1. Direct Material Costs
2. Direct Labor Costs
3. Manufacturing / Conversion Costs
4. Inventory Adjustments:
   • COGS = Opening Inventory + Purchases − Closing Inventory
     (A higher closing inventory reduces current-period COGS, while inventory write-downs increase it.)

What Drives COGS?

1. Input Costs
   • Raw Materials
   • Labour
   • Energy
2. Operational Efficiency
   • Manufacturing Efficiency
   • Capacity Utilisation
3. Competitive Position
   • Supplier Bargaining Power
   • Backward Integration
   • Product Pricing
   • Operating Leverage
4. Business Mix
   • Product Mix
   • Foreign Exchange

Red Flags

• Gross margins declining despite stable raw material prices
• Inventory growing much faster than sales
• Sharp increase in inventory write-downs
• Declining capacity utilisation despite stable demand.
• Frequent changes in inventory valuation methods
• Gross margins consistently exceeding peers without a clear competitive advantage.

COGS Analysis Checklist

• Margins – Is Gross Margin expanding or contracting?
  • Is margin expansion due to lower material costs or structural cost advantage?
• Costs – Are raw material costs increasing?
• Pricing – Is pricing offsetting higher input costs?
• Efficiency – Is capacity utilization improving?
• Inventory
  • Is product mix shifting toward higher-margin products?
  • Is inventory turnover improving?
• Competitive Advantage – Does the company have procurement advantages or economies of scale?

Key Takeaways

• Lower COGS leads to higher Gross Profit, all else being equal.
• Gross Margin should always be analyzed alongside Asset Turnover and ROCE.
  • High Gross Margins do not necessarily imply a superior business—capital-intensive businesses may still generate poor returns.
  • Businesses with high inventory turnover and asset turnover (e.g., retailers and distributors) can generate attractive returns despite relatively low Gross Margins.
  • Ultimately, Return on Capital Employed (ROCE) is driven by both operating margins and capital efficiency.
• Sustainable Gross Margin expansion is typically driven by pricing power, backward integration, cost efficiencies, favourable product mix, or procurement advantages.
• What Gross Margins Reveal About a Business:
  • High Gross Margin →
    • Pricing power
    • Backward Integration
    • Brand
    • Differentiation
  • Low Gross Margin + High Asset Turnover →
    • Economies of Scale
    • Distribution
    • Operational Efficiency.
  • Low Gross Margin + Low Asset Turnover →
    • Weak Unit Economics.
• Gross Margin expansion driven by lower raw material costs is often cyclical, whereas expansion driven by pricing power or structural cost advantages is generally more sustainable.

Other Posts From The Series

• How to Analyze Financial Statements Like an Investor — Revenue