Cost of Goods Sold (COGS)

What is Cost of Goods Sold (COGS)?

Cost of goods sold is the cost assigned to goods sold during a reporting period. In a product business, qualifying costs can enter inventory when goods are purchased or produced and move into COGS when those goods are sold. Inventory remaining at period end stays outside current-period COGS, subject to write-downs and the applicable accounting policy.

COGS is subtracted from revenue to calculate gross profit. Costs below gross profit are generally operating expenses, but the boundary is not determined by a single universal test. Freight, labor, fulfillment, overhead, support, hosting, and payment costs can receive different treatment depending on the business, reporting framework, materiality, and established policy.

Service and software companies often use the term cost of revenue rather than COGS. They should define the categories consistently rather than copy a physical-inventory formula into a model that has no inventory.

What can enter COGS?

For a product business, direct materials, direct production labor, and allocated production overhead can be part of inventory cost. Purchase cost and qualifying freight can also matter. The exact treatment should follow the accounting policy and relevant framework.

• Inventory costs

  Costs assigned to goods held for sale and released to COGS when the related units are sold.

• Production costs

  Qualifying materials, labor, and overhead used to bring inventory to its present condition.

• Period expenses

  Selling, general, administrative, research, and other costs that do not qualify for inventory or cost-of-revenue treatment under the policy.

COGS versus cost of revenue

COGS is strongly associated with goods and inventory. Cost of revenue is often used more broadly for costs associated with delivering service or software revenue. The labels can appear differently across organizations, so compare the underlying policy and categories rather than assuming identical treatment.

Why classification discipline matters

Moving a cost between COGS and operating expenses changes gross profit and gross margin even when total operating profit is unchanged. Consistency makes period comparisons useful. A policy change should be documented and prior comparisons restated or clearly qualified.

Why it matters

COGS helps show how much of reported revenue remains after the cost assigned to the goods sold. That gross profit can be compared across products, periods, and operating models when the classification policy is stable.

The measure does not by itself show cash timing. Inventory may be purchased before the sale, suppliers may be paid later, and customer cash may arrive on a different schedule. Use cash-flow and working-capital views for those questions.

Product-business formulas

• Beginning inventory measured under the selected accounting policy
• Qualifying purchases and production costs added during the period
• Ending inventory under the same costing method
• Revenue for the same reporting period when calculating gross profit

Product-business formulas

COGS = Beginning inventory + Purchases or production costs − Ending inventory
Gross profit = Revenue − COGS

Illustrative inventory calculation

How RunwayCal helps

Common mistakes

• 1Using “cost that disappears with zero customers” as a universal accounting rule.
• 2Applying an inventory formula to a service model without explaining the reporting policy.
• 3Changing classifications between periods to improve gross margin presentation.
• 4Treating gross profit as cash generated or as a runway measure.