Smart restaurant owners turn supplier discounts into measurable profit by calculating the exact margin impact before accepting any deal. Most operators grab every discount without knowing if it actually helps their bottom line. You'll have a straightforward system to evaluate every supplier offer against your real margins.
Why checking discounts matters
Your supplier calls: "This week 15% off beef!" Sounds tempting, but what does this mean for your steak that sells for €32.00?
Without checking, you're gambling:
- Does the discount create meaningful impact
- How much extra margin you actually gain
- If it's worth menu adjustments
- If you can run a temporary promotion
💡 Example:
Your €32.00 steak (incl. 9% VAT) currently has:
- Selling price excl. VAT: €29.36
- Beef cost: €12.00 per portion
- Other ingredients: €2.00
- Total ingredient costs: €14.00
Food cost: (€14.00 / €29.36) × 100 = 47.7%
The 3-step control system
For every discount offer, run this quick evaluation:
Step 1: Calculate current food cost of the dish
Pick your top-selling item where the discount applies. Calculate current ingredient costs and food cost percentage.
Step 2: Calculate new food cost with discount
Apply the discount to the affected ingredient and recalculate total food cost.
Step 3: Determine your action
Decide if you pass savings to customers, keep as extra margin, or split the difference.
💡 Example discount calculation:
15% discount on beef means:
- Beef was: €12.00 per portion
- Beef becomes: €12.00 × 0.85 = €10.20
- New total ingredients: €10.20 + €2.00 = €12.20
- New food cost: (€12.20 / €29.36) × 100 = 41.6%
Difference: 47.7% - 41.6% = 6.1 percentage points improvement
What does this mean in euros per portion?
Converting the percentage difference to euros gives you direct insight into real impact:
Formula: Percentage point difference × Selling price excl. VAT
💡 Euro impact calculation:
6.1 percentage points × €29.36 = €1.79 extra margin per steak
At 20 steaks per week: €1.79 × 20 × 52 = €1,862 additional annual profit
Three options for your discount savings
Based on real restaurant P&L data, here are the most effective approaches:
Option 1: Pass full discount to customers
- Steak temporarily for €30.20 (was €32.00)
- Food cost remains 47.7%
- Higher sales volume due to attractive pricing
Option 2: Keep discount entirely as extra margin
- Steak stays €32.00
- Food cost drops to 41.6%
- €1.79 extra profit per portion
Option 3: 50/50 split
- Steak for €31.10
- Food cost becomes 44.6%
- €0.90 extra profit plus competitive pricing
⚠️ Note:
Always verify the discount period is long enough for menu adjustments. For offers shorter than 2 weeks, option 2 (keeping savings) is typically more practical.
Digital control vs. manual calculation
This system works perfectly with a calculator and notepad, but digital tools speed things up considerably. Food cost calculators can instantly show you what price changes mean for your margins.
Benefits of digital tracking:
- Instant calculation of new food cost
- Overview of impact across all dishes simultaneously
- Historical data on which discounts proved most profitable
- Quick comparison of different scenarios
Skip discounts that aren't worth it
Not every discount deserves your attention. Skip it if:
- The ingredient represents less than 10% of your total ingredient costs
- The discount yields less than €0.50 per portion
- You can't use the product within shelf life
- The discount period is shorter than 1 week
💡 Example small discount:
10% discount on parsley (€0.20 per portion):
- Savings: €0.20 × 0.10 = €0.02 per portion
- Impact on food cost: negligible
Conclusion: Not worth the effort
How do you check a supplier discount? (step by step)
Calculate current food cost
Take your best-selling dish where the discount applies. Add up all ingredient costs and divide by the selling price excl. VAT. Multiply by 100 for the percentage.
Apply discount and recalculate
Multiply the price of the discounted ingredient by (100% - discount percentage). Add up all ingredient costs again and calculate the new food cost.
Calculate euro impact per portion
Subtract the new food cost from the old food cost. Multiply this difference by your selling price excl. VAT. This gives you the extra margin in euros per sold portion.
Determine your strategy
Decide whether you pass the discount to guests (lower menu price), keep it yourself (extra margin), or make a combination. Check if the discount period is long enough for menu changes.
✨ Pro tip
Calculate your 3 highest-impact supplier discounts from the past 90 days and approach those suppliers for recurring monthly deals. Most will agree to secure regular business.
Calculate this yourself?
In the KitchenNmbrs app you can do this in just a few clicks. 7 days free, no credit card.
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Frequently asked questions
Do I need to check every supplier discount?
Focus on discounts for ingredients that represent more than 10% of your dish cost and discounts larger than 10%. Small discounts on garnishes create minimal impact and aren't worth your time.
How do I know if a discount is big enough to take action?
If the discount yields less than €0.50 per portion, the impact is usually too small to matter. Target discounts that save at least €1.00 per portion for meaningful results.
Can I combine discounts with other promotions?
Yes, but verify your total food cost doesn't drop too low. A food cost below 20% might signal you're overpriced for your market segment.
Do I need to include VAT calculating discount impact?
No, always calculate with prices excluding VAT. Your supplier's discount is also excluding VAT, so you're comparing like with like.
How long does a discount period need to be worthwhile?
For menu changes, at least 2 weeks minimum. Shorter periods work better by keeping the discount as extra margin without menu adjustments.
What if the discount requires large minimum purchases?
Calculate if you can use the extra quantity within shelf life. If 20% goes to waste, a 15% discount becomes worthless.
📚 Sources consulted
- EU Verordening 852/2004 — Levensmiddelenhygiëne (2004) — Official source
- EU Verordening 853/2004 — Hygiënevoorschriften voor levensmiddelen van dierlijke oorsprong (2004) — Official source
- EU Verordening 1169/2011 — Voedselinformatie aan consumenten (2011) — Official source
- NVWA — Hygiënecode voor de horeca (2024) — Official source
- NVWA — Allergenen in voedsel (2024) — Official source
- Codex Alimentarius — International Food Standards (2024) — Official source
- FSA — Safer food, better business (HACCP) (2024) — Official source
- BVL — Lebensmittelhygiene (HACCP) (2024) — Official source
- Warenwetbesluit Bereiding en behandeling van levensmiddelen (2024) — Official source
- WHO — Foodborne diseases estimates (2024) — Official source
Food Standards Agency (FSA) — https://www.food.gov.uk
The HACCP standards shown in this application are for informational purposes only. KitchenNmbrs does not guarantee that displayed values are current or complete. Always consult the FSA or your local authority for the latest regulations.
Written by
Jeffrey Smit
Founder & CEO of KitchenNmbrs
Jeffrey Smit built KitchenNmbrs from 8 years of hands-on experience as kitchen manager at 1NUL8 Group in Rotterdam. His mission: give every restaurant owner control over food cost.
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