I'll admit it - most new restaurant owners think a 20% discount only cuts their profit by 20%. The reality hits much harder. That same discount can slash your actual profit by 30% or more.
Why discounts hurt more than you realize
A 20% discount doesn't cut your profit by 20%. It's far worse than that. Say you normally run a 65% margin and offer a 20% discount - your margin plummets to 45%. That's nearly a third less profit per dish.
💡 Example:
Pasta carbonara normally €24.00 incl. VAT:
- Sales price excl. VAT: €22.02
- Ingredient costs: €7.50
- Margin: €14.52 (66%)
With 20% discount (€19.20 incl. VAT):
- Sales price excl. VAT: €17.61
- Ingredient costs: €7.50 (stays the same)
- Margin: €10.11 (57%)
Margin loss: from €14.52 to €10.11 = 30% less profit!
The actual formula for discount damage
Here's how you calculate the real impact of any discount on your margin:
New margin = ((Sales price × (1 - discount%)) - Cost price) / (Sales price × (1 - discount%))
Or keep it simple: subtract the discount from your sales price, leave your costs unchanged, then calculate your new margin percentage.
⚠️ Important:
Your fixed costs (rent, staff, utilities) don't budge with discounts. Only your sales price drops. And that's exactly why the impact stings so much.
Break-even math with discounts
Want to earn the same amount with discounts? You'll need to sell significantly more. But here's something most kitchen managers discover too late - the extra volume needed grows exponentially with each discount percentage point.
Extra sales needed = Discount% / (100% - Discount%)
💡 Example discount impact:
- 10% discount → 11% more sales needed
- 20% discount → 25% more sales needed
- 25% discount → 33% more sales needed
- 30% discount → 43% more sales needed
With a 20% discount, you need a quarter more customers to earn the same!
Smarter discount tactics for opening
Skip the blanket discounts. Try these approaches instead:
- Free side dish: Costs you only the food cost (€2-4), but customers perceive €8-12 value
- Second course half price: Boosts your average bill, creates less damage than total discount
- Complimentary drink: Costs €1-2, feels like €4-6 value to guests
- Happy hour windows: Fill slow periods, maintain full prices during rush times
Building discounts into your opening budget
Factor discounts into your opening financial plan. Budget for the first 3 months like this:
- Month 1: 25% average discount (heavy trial customer focus)
- Month 2: 15% average discount (word-of-mouth building)
- Month 3: 10% average discount (establishing regulars)
- From month 4: Full pricing with strategic promotions only
💡 Opening calculation example:
Expected revenue month 1: €15,000
- Without discount: 65% margin = €9,750 profit
- With 25% discount: 40% margin = €6,000 profit
- Difference: €3,750 less in month 1
Account for this in your cashflow!
Tracking your discount performance
Monitor these metrics throughout your discount periods:
- New customer count: Are discounts actually driving traffic?
- Average transaction value: Do discounted customers order more or less?
- Return rate at full price: Are they building loyalty or just bargain hunting?
- Daily margin totals: Track absolute euros, not just percentages
Tools like a food cost calculator can instantly show you what discounts do to your margins per dish, so you don't have to crunch numbers manually.
How do you calculate the impact of discount promotions? (step by step)
Determine your current margin per dish
Calculate what each dish costs in ingredients and what your current margin is. For example: pasta €7.50 cost, €22.02 sales excl. VAT = 66% margin.
Calculate the new sales price with discount
Subtract the discount percentage from your menu price. With 20% discount, €24.00 incl. VAT becomes €19.20 incl. VAT → €17.61 excl. VAT.
Calculate your new margin
Divide your profit after discount by your new sales price. (€17.61 - €7.50) / €17.61 = 57% new margin. Compare with your old margin of 66%.
Determine how much extra sales you need
Use the formula: Discount% / (100% - Discount%). With 20% discount: 20 / 80 = 25% more sales to earn the same.
Plan your discount period into your cashflow
For the first 3 months, budget for lower margins due to discounts. Keep €3,000-5,000 extra buffer for the opening period.
✨ Pro tip
Track your margin impact daily during the first 14 days of any discount promotion. If you're losing more than 35% of your normal daily profit, either reduce the discount percentage or increase portion sizes instead of cutting prices.
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
How much discount can I give maximum without making a loss?
That depends entirely on your current margin. With a 65% margin, you could theoretically discount 65% and break even. But remember your fixed costs - never exceed 30% discount in practice.
Is it better to discount the whole menu or only certain dishes?
Selective discounting protects your bottom line better. Focus discounts on high-margin items like sides and desserts while keeping main courses at full price. This shields your primary revenue streams.
How long should I run discounts during my opening period?
Limit opening discounts to 3 months maximum with decreasing percentages. Month 1: 25%, month 2: 15%, month 3: 10%. Beyond that, customers expect low prices permanently.
Should I calculate discounts including or excluding VAT?
Always use prices excluding VAT for margin calculations. You apply the discount to the VAT-inclusive price, but your profit analysis should work with excl. VAT figures.
What if discounts push me below my break-even point?
Either stop the discount immediately or dramatically increase volume. Opening losses are normal, but structural losses aren't sustainable. Check your cashflow weekly during discount periods.
Can I use different discount percentages for different meal periods?
Absolutely - this is actually smarter than flat discounts. Run higher discounts during slow lunch periods and lower ones during busy dinner service. This maximizes revenue while filling seats during off-peak times.
📚 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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