Running a busy restaurant can make it feel as though the most important number is the amount of money coming through the till.

But high sales do not automatically mean a profitable restaurant.

Two restaurants could each generate £50,000 of monthly revenue and have completely different financial results.

One might be producing a healthy profit.

The other might be losing money because food costs, staffing, delivery commissions and overheads are absorbing almost everything it earns.

That is why restaurant owners should understand more than turnover.

At Taxwise Accountants NI, we work with hospitality businesses across Belfast and Northern Ireland, and these are seven of the numbers we believe restaurant owners should regularly understand.

Number	What it tells you
1. Sales Revenue	How much the restaurant is generating
2. Food Cost %	How much sales are being absorbed by ingredients
3. Gross Profit Margin	What remains after direct food costs
4. Labour Cost %	How much revenue is being spent on staffing
5. Prime Cost	The combined pressure from food and labour
6. Average Customer Spend	How much each transaction/customer generates
7. Break-Even & Cash Position	How much you need to sell and whether the cash is actually available

The important point is not simply calculating these numbers once.

The real value comes from monitoring how they move over time.

1. Sales Revenue

Revenue is the obvious starting point.

But restaurant owners should look beyond one total monthly sales figure.

Ideally, you should understand how revenue changes by period and, where your systems allow it, by sales channel.

For example, you might have:

• Dine-in sales
• Takeaway sales
• Delivery-platform sales
• Telephone or website orders
• Catering or event income

A restaurant could report increasing revenue while the underlying business becomes less profitable.

Perhaps more of the sales are coming through delivery platforms. Perhaps discounts have increased. Perhaps prices have remained unchanged while ingredient and payroll costs have risen.

So the question should not simply be:

“Are our sales increasing?”

It should be:

“Are our profitable sales increasing?”

Example

Suppose monthly revenue increases from £40,000 to £50,000.

That looks excellent.

But if costs increase from £36,000 to £49,000 during the same period, the additional £10,000 of revenue has generated very little additional profit.

Revenue is therefore important — but it needs to be analysed alongside the next six numbers.

2. Food Cost Percentage

For most restaurants, cafés and takeaways, food is one of the largest direct costs.

The food-cost percentage tells you how much of your food sales are being absorbed by ingredients.

A simple calculation is:

Food Cost % = Food Cost ÷ Relevant Sales × 100

For example:

Food sales: £40,000
Food cost: £12,000
Food cost percentage: £12,000 ÷ £40,000 × 100 = 30%

That means approximately 30p of every £1 of sales is being absorbed by food costs before considering staff, rent, utilities, VAT and other overheads.

The percentage itself is only part of the story.

The trend is often more useful.

If food cost moves from 30% → 32% → 35% over several months, management should investigate why.

Possible reasons might include higher supplier prices, excessive wastage, poor portion control, menu pricing, theft, inaccurate stock records or changes in the mix of products being sold.

A restaurant owner who looks only at revenue may never notice the problem until year-end accounts are prepared.

By that point, thousands of pounds of margin could already have been lost.

3. Gross Profit Margin

Gross profit tells you how much remains after deducting the direct cost of generating your sales.

A simplified restaurant calculation might be:

Sales – Cost of Sales = Gross Profit

If:

Sales = £50,000
Cost of sales = £16,000
Gross profit = £34,000

The gross profit percentage would be:

£34,000 ÷ £50,000 × 100 = 68%

Why does this matter?

Because the restaurant still needs that £34,000 to pay for everything else.

That might include:

• Payroll
• Rent
• Business rates
• Gas and electricity
• Insurance
• Software
• Accountancy
• Marketing
• Delivery commissions
• Repairs
• Finance costs

After all of those expenses, whatever remains is the actual operating profit.

That is why a business can appear extremely busy and still make very little money.

Watch the trend

If gross margin was historically 70% but has fallen to 64%, that movement deserves investigation.

The cause may be rising ingredients, discounts, incorrect pricing, wastage or a change in the type of products customers are buying.

Small percentage changes can become significant when applied to hundreds of thousands of pounds of annual sales.

4. Labour Cost Percentage

Hospitality is labour intensive.

For many restaurants, payroll is one of the largest expenses after food.

That makes labour cost percentage one of the most important numbers to monitor.

A simple calculation is:

Labour Cost % = Relevant Labour Cost ÷ Sales × 100

Suppose:

Monthly revenue: £50,000
Relevant labour cost: £15,000
Labour cost: £15,000 ÷ £50,000 × 100 = 30%

Again, there is no single percentage that is correct for every restaurant.

A fine-dining restaurant with a large front-of-house team operates differently from a takeaway, coffee shop or highly automated quick-service business.

The useful question is:

Is our labour cost moving in the right direction relative to sales?

For example, imagine sales fall by 15%, but payroll remains almost unchanged.

Labour cost as a percentage of revenue will rise, potentially putting pressure on profitability.

Regular management reporting makes this visible much earlier.

5. Prime Cost

Food and labour are often the two biggest controllable costs in hospitality.

Looking at them together can therefore be extremely useful.

This is commonly referred to as prime cost.

In simplified terms:

Prime Cost = Cost of Sales + Labour Cost

Suppose a restaurant has:

Revenue: £60,000
Food/direct costs: £18,000
Labour: £18,000
Prime cost: £36,000
Prime cost percentage: £36,000 ÷ £60,000 × 100 = 60%

That leaves £24,000 before rent, utilities, insurance, marketing, professional fees, repairs and all the other overheads are considered.

Monitoring prime cost helps restaurant owners see the combined impact of the two areas management can often influence most directly.

You might successfully negotiate lower supplier prices but lose the saving through excessive staffing.

Or you might reduce labour cost while food wastage rises.

Looking at both together provides a much more useful management picture.

6. Average Customer Spend

Sometimes the easiest way to increase restaurant revenue is not attracting significantly more customers.

It is increasing the value generated from the customers you already have.

Average transaction value or average customer spend helps measure this.

A simple version is:

Revenue ÷ Number of Transactions

For example:

Monthly sales: £50,000
Transactions: 2,000
Average transaction: £25

If average spend can increase from £25 to £27 without reducing customer numbers, the same 2,000 transactions would produce £54,000 revenue.

That is an additional £4,000 per month without necessarily needing another 160 customers.

Restaurant owners can therefore consider whether menu structure, pricing, drinks, desserts, sides, premium items and other legitimate upselling opportunities are improving average transaction value.

The important point is not simply increasing prices.

It is understanding the relationship between customer numbers × average spend × margin.

7. Break-Even Point & Cash Position

The final number is really a pair of closely related questions:

How much do we need to sell before the restaurant starts making money?

and:

Do we actually have enough cash to pay the bills?

These are not the same thing.

Break-Even

Every restaurant has fixed costs that need to be paid regardless of how busy the restaurant is.

These can include rent, salaries, insurance, software and other overheads.

The break-even point estimates the level of sales required before the business starts generating profit.

A simplified formula is:

Fixed Costs ÷ Contribution Margin %

Suppose monthly fixed costs are £20,000 and the contribution margin is 40%.

The approximate break-even revenue would be:

£20,000 ÷ 40% = £50,000

That means the restaurant may need approximately £50,000 of monthly sales before generating an operating profit, based on those assumptions.

Now management has something commercially useful to work with.

Instead of saying “We had a good month,” you can ask:

“We generated £56,000 against a £50,000 break-even point — how much profit should that have produced?”

Profit Is Not the Same as Cash

This point catches many growing businesses.

A restaurant can make an accounting profit and still experience serious cash-flow problems.

Money may be required for:

• VAT
• PAYE
• Supplier invoices
• Rent
• Loan repayments
• Equipment
• Corporation Tax or Income Tax
• Unexpected repairs

A profitable business can therefore find itself unable to pay an upcoming liability if cash has not been managed properly.

This is why restaurant owners should monitor both profitability and available cash.

Cash-flow forecasting can identify periods where the business may come under pressure before the problem becomes urgent.

Putting the Seven Numbers Together

Looking at any one number in isolation can be misleading.

Imagine a restaurant reports revenue increased by 10%. Great news.

But at the same time:

• Food cost increased
• Labour percentage increased
• Gross margin fell
• Average transaction value remained unchanged
• Cash reserves decreased

The business has grown — but not necessarily in a financially healthy way.

Now consider another restaurant where revenue has increased only 3%, but food cost has improved, labour is better controlled, gross margin is stronger and cash generation has increased.

That business may actually be performing significantly better.

This is why proper management reporting matters.

How Often Should Restaurant Owners Review These Numbers?

For many hospitality businesses, waiting until annual accounts are prepared is simply too late.

Your annual accounts are essential for compliance, but they primarily tell you what already happened.

If a problem started nine months ago, year-end accounts may reveal it only after thousands of pounds have been lost.

For a busy restaurant, monthly management information can be far more useful.

Depending on the business, a regular management report might show:

• Revenue
• Food Cost %
• Gross Profit
• Gross Margin %
• Payroll
• Labour Cost %
• Prime Cost
• Operating Expenses
• Operating Profit
• VAT Position
• Cash Position
• Debtors / Creditors where relevant
• Budget vs Actual

The exact report should be designed around the business rather than using the same template for every restaurant.

Delivery Platforms Can Distort the Numbers

Restaurants and takeaways using delivery platforms should pay particular attention to how those transactions are recorded.

The amount arriving in the bank account may not equal the actual customer sales figure.

The settlement can include deductions for commission, promotions, refunds and other adjustments.

If bookkeeping simply records the net amount received as revenue, management information can potentially become misleading.

Good bookkeeping should allow owners to understand:

Gross platform sales minus platform costs and adjustments equals net settlement received

This gives a clearer picture of whether delivery sales are genuinely profitable.

VAT Should Never Be Confused With Revenue

Another common cash-flow issue is treating all money received from customers as though it belongs to the restaurant.

For a VAT-registered business, part of the cash collected represents VAT that may ultimately need to be paid to HMRC, after taking account of allowable input VAT and the relevant VAT rules.

That means a healthy bank balance shortly after a busy trading period can create a false sense of financial security.

Good bookkeeping and VAT reporting help the owner understand how much cash needs to remain available for upcoming liabilities.

Restaurant Accounting Should Be About More Than Filing Accounts

A traditional accountant can tell you: “Your business made £X profit last year.”

Useful accounting support should also help you understand:

• Why did it make that profit?
• Which costs changed?
• Are margins improving?
• How much cash will we need?
• Where is the business heading?

That is where management accounts and an outsourced finance function can become particularly valuable for established hospitality businesses.

How Taxwise NI Helps Hospitality Businesses

Taxwise Accountants NI supports restaurants, cafés and takeaways across Belfast and Northern Ireland.

Our hospitality accounting support can include annual accounts, Corporation Tax, VAT, payroll, bookkeeping, Xero, management accounts, cash-flow reporting, delivery-platform reconciliation, margin analysis and tax planning.

For larger or growing hospitality businesses, our Outsourced Finance Department can provide more regular financial reporting and management information without necessarily requiring the business to employ a full-time Finance Manager.

Want to Know What Your Restaurant Numbers Are Really Telling You?

High turnover is encouraging.

But the numbers behind that turnover determine whether the business is actually creating profit and cash.

If you run a restaurant, café or takeaway and want clearer visibility over your margins, costs and profitability, Taxwise NI would be happy to discuss your requirements.

Understand Your Numbers Before Year End.

Book a Free Hospitality Accounting Review

Frequently Asked Questions

What is the most important financial number for a restaurant?

There is no single number that gives a complete picture. Revenue, food cost, labour, gross margin, prime cost, cash flow and break-even all need to be considered together.

How do I calculate restaurant food cost percentage?

A simplified calculation is food cost divided by relevant food sales multiplied by 100. Accurate stock and purchase records are important when analysing the figure properly.

What is labour cost percentage?

Labour cost percentage compares relevant staff costs against revenue. Monitoring the trend can help identify whether staffing costs are increasing faster than sales.

What is prime cost in a restaurant?

Prime cost generally combines the major direct food and labour costs. It can be a useful way of seeing how much of restaurant revenue is being consumed by these two significant cost areas.

Why can a profitable restaurant have cash-flow problems?

Profit is an accounting measure, while cash flow reflects when money actually enters and leaves the business. VAT, tax, supplier payments, debt repayments and investment can all reduce available cash even where the business is profitable.

Should restaurants prepare management accounts?

For established or growing hospitality businesses, monthly or quarterly management accounts can provide much more timely information than relying solely on annual statutory accounts.

Can Taxwise prepare restaurant management accounts?

Yes. Taxwise NI can provide management reporting alongside bookkeeping, VAT, payroll, annual accounts and wider outsourced finance support.