A profit and loss statement, or P&L, is one of the most useful documents in a restaurant and one of the most under-read. Many owners skim to the net profit line, feel relief or dread, and stop there. But the net profit number is a summary of dozens of decisions made throughout the month, and the P&L is where those decisions are visible individually, if you know where to look.

Revenue: More Than Just a Total

The top line matters, but the breakdown matters more. Revenue split by category, food, beverage, catering, delivery, reveals shifts a single total would hide. A restaurant where total revenue is flat but dine-in is declining while delivery is growing is facing a very different set of decisions than one where everything is simply soft.

Cost of Goods Sold and the Real Food Cost Story

Cost of goods sold (COGS) as a percentage of food revenue is the number most owners already track, typically targeting somewhere in the 28 to 35% range depending on concept. But a single monthly percentage can mask real problems. A spike this month deserves investigation into three usual suspects: a supplier price increase that wasn't reflected in menu pricing, portioning drift on the line, or waste that isn't being tracked.

Labor Cost: Read It in Two Parts

Total labor cost matters, but splitting it into hourly labor and management salary tells a more useful story. Hourly labor should move roughly in proportion with sales volume; if it's creeping up as a percentage while sales are flat, that's a scheduling efficiency problem worth investigating directly, not just a budget line to trim blindly.

  • Compare labor cost percentage week over week, not just month over month, since scheduling problems show up faster at that resolution
  • Separate overtime from base wages; overtime creeping up is often the earliest sign of understaffing or scheduling gaps
  • Watch management salary as a fixed cost that needs to be covered regardless of a slow week

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Prime Cost: The Number That Matters Most

Prime cost, the combination of COGS and total labor cost, is the single most useful health check on a P&L because it captures the two expenses an owner has the most day-to-day control over. Most full-service restaurants target a prime cost between 60 and 65% of revenue. Watching this number trend over consecutive months, rather than reacting to any single month, reveals whether the business is drifting in the wrong direction before it becomes an emergency.

Operating Expenses: The Line Items People Forget to Question

Rent, utilities, insurance, marketing, and repairs often get treated as fixed and unquestionable, but they deserve periodic scrutiny too. A repairs and maintenance line that's been climbing for three straight months might mean it's time to evaluate whether aging equipment is due for replacement rather than continued patching, a decision that's easy to miss if the P&L is only read for the bottom line.

Reading the P&L as a Monthly Habit, Not a Year-End Task

The real value of a P&L comes from reading it consistently, ideally monthly, and comparing it against prior months and the same month last year, not just against a budget. Patterns that are invisible in any single month become obvious across a six-month trend line. An owner who reads the P&L closely every month rarely gets surprised by a bad quarter, because the warning signs showed up in the details long before the total did.