The Ultimate Bottom Line
Net Profit is the strictest measure of a company's profitability. While Gross Margin ignores salaries, and Operating Margin ignores taxes, Net Profit strips away absolutely everything. It tells you the exact amount of cash the entity generated that can be deposited straight into the owner's bank account or reinvested.
Dissecting the Variables
The Expense Ledger
To calculate an accurate Net Profit, you cannot miss a single line item. You must include direct COGS, developer salaries, AWS hosting bills, legal retainer fees, and casual office lunches. Everything reduces the bottom line.
Interest and Taxation
Unlike EBITDA, Net Profit ruthlessly deducts the reality of government taxation and bank loan interest. A heavily leveraged company paying 12% interest on venture debt will have an obliterated Net Profit despite a booming Gross Margin.
Net Profit Margin
Calculated by dividing Net Profit by Total Revenue. A 5% Net Profit Margin means you keep 5 cents of every dollar you sell. Grocery stores survive on 2%, while elite software companies command 30%+ margins.