How to Calculate Profit Margin per Invoice: Formula and Example

To measure profit margin per invoice, calculate net sales after discounts and returns, excluding sales tax, then subtract the cost of goods sold for the invoiced items. The result is gross profit.

Gross Profit Margin = (Gross Profit ÷ Net Sales) × 100.

For example, if an invoice has net sales of 1,000 and product costs of 700, gross profit is 300 and the margin is 30%. Consider shipping, commissions, and other transaction-related costs when evaluating broader profitability. Try Cash Cloud for free to explore sales, cost, and reporting tools.