Comp percentage is the dollar value of complimentary food and beverage given away during a period, expressed as a percentage of total sales for that period.
Formula: Comp % = Total Comps Issued ÷ Total Sales × 100
Comps versus voids — a critical distinction
These two terms get confused but mean very different things on the P&L:
- Comp: the item was prepared and served, then discounted to zero (or to a partial discount). The product cost left the kitchen; the revenue did not arrive. Shows up in food cost AND in the comp line.
- Void: the item was deleted from the ticket before being prepared. No food was used, no sale recorded. Doesn't affect food cost; doesn't affect revenue.
Comps cost real money. Voids do not (assuming the system enforces them correctly). Operators who treat them interchangeably distort their analysis of both.
What's the "right" comp percentage?
There is no industry-standard answer. The right comp percentage varies by:
- Concept: a fine-dining room running a "VIP" program will run higher comps by design than a quick-service operation.
- Daypart: brunch with regulars typically runs different comps than a Tuesday-night service-recovery pattern.
- Service-recovery philosophy: some operators comp aggressively to keep guests happy; others rarely comp and prefer to escalate to manager intervention.
What does matter is the trend. A comp percentage that drifts upward week-over-week is a signal something is breaking. Set your own baseline in month one, then watch the trend.
What an upward comp trend signals
- Kitchen mistakes: rising re-fires (re-made plates), seafood substitutions, items sent back, chef's-table comps for plating issues.
- Front-of-house overcorrection: servers comping minor issues that should have been a sincere apology instead.
- System gaming: the rare-but-real case where a server is comping items at the end of the night to create a tip-pool advantage. Drift in a single server's comp pattern flagged in real time catches this.
- Marketing/promo confusion: a "first-drink-free" offer being entered as a comp instead of a discount/promo line distorts the true comp number.
How to track comp percentage usefully
- Separate comp from discount/promo lines in the POS reporting structure.
- Track by server and by manager who authorized the comp — not just by aggregate.
- Review weekly, not monthly. Patterns surface in weeks, smooth out by month.
- Set a personal baseline in month one (e.g., "we run 1.8% on average") and treat the baseline as the normal — flag deviations of more than 0.5 points either direction.
Related concepts
- Prime cost — comps inflate prime cost because the food cost is real but the revenue is gone
- Food cost percentage — the COGS half that comps push upward
- How to read your P&L — where comps live on the P&L