Cost reduction doesn't always have the same effect on your net profit. Spending one euro less on ingredients works differently than spending one euro less on energy or staff. By calculating the impact per euro of cost reduction, you'll see where your efforts will pay off the most.
Why cost reductions have different effects
Not all cost items have the same impact on your profit. This is because of:
- VAT effects: Some costs include VAT, others don't
- Frequency: Daily costs (ingredients) vs. monthly costs (rent)
- Variability: Costs that move with revenue vs. fixed costs
💡 Example:
Restaurant with €50,000 monthly revenue saves €500:
- On ingredients: Direct €500 more profit
- On energy costs: €500 more profit, but gradually
- On rent: €500 more profit, but one-time effect
Impact varies by cost type
The impact formula per cost item
For each cost reduction, you calculate the net impact on an annual basis:
Annual impact = Monthly savings × 12 × (1 - VAT effect)
- Ingredient costs: VAT effect = 0 (you pay 9% VAT, but this doesn't count toward profit)
- Energy costs: VAT effect = 0.21 (21% VAT you can reclaim)
- Rent costs: VAT effect = 0.21 (if landlord charges VAT)
💡 Example calculation:
€300 less energy costs per month:
- Gross savings: €300 × 12 = €3,600
- VAT reclaim: €3,600 × 0.21 = €756
- Actual savings: €3,600 - €756 = €2,844
Net effect: €2,844 per year
Priority matrix for cost reduction
Rank your possible savings by impact per euro of effort:
💡 Example priorities:
Restaurant with €40,000 monthly revenue:
- Highest impact: Food cost from 35% to 32% = €14,400/year
- Medium impact: Energy costs -10% = €2,400/year
- Lowest impact: Phone costs -€50/month = €600/year
Focus first on food cost optimization
Food cost has the biggest lever
For most restaurants, food cost optimization has the biggest impact:
- Direct impact on every sale
- No VAT complications
- Can be influenced daily
- Scale effect with more revenue
⚠️ Note:
Always calculate the realistic savings. Reducing food cost from 35% to 20% is usually not achievable without quality loss.
Calculation per cost type
Ingredient costs (food cost):
Impact = (Current food cost % - New food cost %) × Annual revenue excl. VAT
Energy costs:
Impact = Monthly savings × 12 × 0.79 (after VAT effect)
Staff costs:
Impact = Hourly wage savings × Working hours per year × 1.3 (including employer contributions)
💡 Practical example:
Bistro with €500,000 annual revenue compares options:
- Food cost 33% → 30% = €13,761 profit/year
- Energy -€200/month = €1,896 profit/year
- 1 hour less staff/day = €15,600 profit/year
Staff optimization wins, then food cost
Implementation and monitoring
After your calculation:
- Start with the biggest impact that's realistically achievable
- Measure monthly whether you're hitting your target savings
- Adjust if results fall short
- Never combine all savings at once (too much change)
A tool like KitchenNmbrs helps you monitor food cost optimizations and shows immediately what the impact is on your margins.
How do you calculate the impact of cost reduction? (step by step)
Inventory all possible savings
Make a list of all cost items where you can save. Note per item how much you can realistically save per month. Focus on the biggest cost items: ingredients (food cost), staff, and energy.
Calculate the net annual impact per saving
Multiply each monthly saving by 12. Deduct VAT where applicable (21% on energy, rent). For food cost: calculate (current % - new %) × annual revenue excl. VAT.
Rank by impact and feasibility
List all savings in order of net annual impact. Check which are realistically achievable without quality loss. Start with the highest impact you can definitely realize.
✨ Pro tip
Focus on savings you can measure and influence. You can adjust food cost daily, energy costs only in the longer term.
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
Which cost reduction usually has the biggest impact?
Food cost optimization often has the biggest impact because it affects every sale. A reduction of 2-3 percentage points can save thousands of euros per year, depending on your revenue.
Should I include VAT in my calculation?
Yes, for energy costs and rent you can often reclaim 21% VAT, so the actual savings are lower. For ingredients (9% VAT) you calculate with the price excl. VAT for your food cost.
Can I implement all savings at once?
Not advisable. Too many changes at once can disrupt your operation. Start with the biggest impact and implement a new saving every 2-3 months.
How do I know if my savings target is realistic?
Check industry benchmarks. Food cost below 25% is often unrealistic, above 35% too high. Energy savings of more than 20% are usually not achievable without major investments.
What if my calculated savings don't materialize?
Measure your progress monthly and adjust. Often savings in practice are 20-30% lower than calculated due to unforeseen effects or implementation issues.
📚 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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