Cost of Goods Sold (COGS): What It Is and Why It Matters
If you sell a product — whether it's a plate of food, a retail item, or materials on a job — Cost of Goods Sold is one of the most important numbers on your financial statements. It's also one of the most commonly misunderstood.
What Is COGS?
Cost of Goods Sold (COGS) is the direct cost of producing or acquiring whatever you sold. It only includes costs tied directly to the product itself — not your rent, marketing, or office staff.
The basic formula:
Beginning Inventory + Purchases − Ending Inventory = COGS
If you started the month with $10,000 of inventory, bought $5,000 more, and ended the month with $8,000 left, your COGS for the month is $7,000 ($10,000 + $5,000 − $8,000).
What Counts as COGS
For a restaurant:
Food and beverage ingredients
Packaging used for the food itself (to-go containers, cups)
For a retail business:
The wholesale cost of products purchased for resale
Freight and shipping to get inventory in the door
For a business selling manufactured goods:
Raw materials
Direct labor to produce the item
Manufacturing supplies used in production
What Does NOT Count as COGS
These are operating expenses, not COGS — even though it's tempting to lump them in:
Rent and utilities
Marketing and advertising
Office or admin salaries
Insurance
Equipment that isn't part of the product itself
Keeping this line clean matters — mixing operating expenses into COGS distorts your gross profit and makes it harder to see how a product is actually performing.
Why COGS Matters
1. It determines your gross profit. Revenue − COGS = Gross Profit. This is the single most important number for knowing whether your pricing actually works, before overhead even enters the picture.
2. It drives your pricing decisions. If you don't know your true cost per item, you're guessing at your margins. Accurate COGS tells you exactly how much room you have to price, discount, or run promotions.
3. It affects your taxes. COGS is deducted from revenue before calculating taxable income, so accurate tracking directly affects your tax bill. Overstating or understating it can create real problems at tax time.
4. It reveals trends. Rising COGS as a percentage of revenue is often an early warning sign — supplier price increases, waste, theft, or portion control issues. Tracking it over time catches problems while they're small.
5. It's required for accrual accounting and inventory-based businesses. Any business carrying inventory as a meaningful part of income generally needs to track COGS properly and use accrual-based methods for it, regardless of overall accounting method.
A Simple Example
A restaurant sells $50,000 in food during the month. Ingredient costs (COGS) come to $16,000.
Gross profit: $50,000 − $16,000 = $34,000
Gross margin: $34,000 ÷ $50,000 = 68%
That 68% is what's left to cover rent, labor, utilities, and everything else — before any actual profit. Most restaurants target a food cost percentage (COGS ÷ revenue) in the 28–35% range; tracking it monthly shows quickly if that number starts drifting.
The Bottom Line
COGS isn't just a line on the income statement — it's the foundation of your pricing, your margins, and your true profitability. Tracking it accurately, separating it cleanly from operating expenses, and watching it over time turns it from a bookkeeping formality into one of the most useful numbers you have for running the business.
Need Help Tracking COGS Accurately?
Getting COGS right takes clean inventory tracking and the right chart of accounts behind it. Oakridge Accounting Services, based in Phoenix, Arizona, helps restaurants, retail businesses, and other small and growing companies track COGS, protect margins, and build financial reports they can actually use to price and plan. Visit www.oakridgeaccountingservices.com to learn more or schedule a conversation.
This is general information, not accounting advice for your specific situation.
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