A rent increase directly affects your net margin. Where you previously had, for example, 8% net margin, it can drop to 5% after a rent increase of €500 per month. In this article, you'll learn exactly how to calculate the impact and what options you have.
What is net margin and why is it important?
Net margin is the percentage of your revenue that remains after all costs are deducted. The difference from gross margin: with net margin you also include fixed costs like rent, staff, energy, and depreciation.
💡 Example:
Restaurant with €40,000 monthly revenue:
- Revenue: €40,000
- Food cost (30%): €12,000
- Staff: €15,000
- Rent: €3,000
- Other costs: €6,000
Net profit: €4,000 = 10% net margin
A healthy net margin for restaurants is between 3% and 8%. Anything above 8% is excellent, below 3% becomes critical.
How do you calculate the impact of a rent increase?
You calculate the impact of a rent increase on your net margin by dividing the difference in fixed costs by your monthly revenue.
Formula:
Net margin loss = (Rent increase per month / Monthly revenue) × 100
💡 Example calculation:
Situation: rent increase of €800 per month
- Current monthly revenue: €35,000
- Rent increase: €800
- Impact: (€800 / €35,000) × 100 = 2.3%
Your net margin drops by 2.3 percentage points
⚠️ Note:
This is a direct impact. If your net margin was 6%, it's now 3.7%. At a margin of 3%, you're in the red.
What options do you have with a rent increase?
You have four main options to absorb a rent increase:
- Increase revenue: More guests or higher average bill
- Raise menu prices: Pass it directly to customers
- Lower costs: Reduce food cost or other expenses
- Combination: A bit of everything
How much extra revenue do you need?
To maintain the same net profit, you need to generate extra revenue equal to the rent increase divided by your current net margin.
Formula:
Required extra revenue = Rent increase / (Current net margin / 100)
💡 Example:
Rent increase €600, current net margin 8%:
- Required extra revenue: €600 / 0.08 = €7,500 per month
- At 25 working days: €300 extra per day
- At average bill €32: 10 extra customers per day
Menu price increase as a solution
A menu price increase of 3-5% usually goes unnoticed by customers and fully compensates for many rent increases.
💡 Example price increase:
Monthly revenue €40,000, rent increase €800:
- Required price increase: (€800 / €40,000) × 100 = 2%
- Dish at €24 becomes €24.50
- Dish at €18 becomes €18.35
Result: rent increase fully compensated
When does it become critical?
A rent increase becomes problematic if:
- Your net margin drops below 2%
- The rent increase is more than 15% of your current net profit
- Your rent becomes more than 8% of your revenue
- You have no room for price increases (expensive market)
⚠️ Note:
If your rent becomes more than 10% of your revenue, your business is probably no longer profitable to operate. Then you should seriously consider moving.
How do you monitor this in practice?
Track your actual net margin monthly. Many entrepreneurs only calculate food cost and forget fixed costs. A system like KitchenNmbrs helps you track all costs and immediately see the impact of changes like rent increases.
How do you calculate the impact of a rent increase? (step by step)
Calculate your current net margin
Add up all costs from last month: food cost, staff, rent, energy, other. Subtract this from your revenue. Divide the result by revenue and multiply by 100 for the percentage.
Calculate the direct impact
Divide the monthly rent increase by your monthly revenue and multiply by 100. This gives the number of percentage points your net margin will drop.
Determine your compensation strategy
Calculate how much extra revenue you need (rent increase divided by current net margin) or what price increase is needed (rent increase divided by current revenue times 100).
✨ Pro tip
Check not just your overall net margin, but also per day of the week. Friday and Saturday often compensate for the unprofitable Monday and Tuesday. If your rent increases, focus on those weak days.
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
Can I always pass a rent increase through in my prices?
Not always. It depends on your market and competition. A price increase of 2-3% usually goes unnoticed by customers, but at 5% or more they may stay away.
How much rent is normal as a percentage of revenue?
For restaurants, 6-8% of revenue is standard. Above 10% becomes critical. In expensive city centers it can go up to 12%, but then your net margin needs to be higher elsewhere.
What if my net margin is already low and I get a rent increase?
Then you have a problem. With a net margin below 3%, any rent increase can be fatal. Seriously consider moving or negotiating with your landlord.
Should I include VAT in this calculation?
No, always calculate with amounts excluding VAT. Your revenue and costs are then comparable. VAT is a pass-through and doesn't affect your margin.
How often should I check my net margin?
At least monthly. With major cost changes like rent increases, do it immediately. This way you see trends and can adjust in time before it's too late.
📚 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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