A 25% discount makes money only when the contribution from visits it causes exceeds the margin surrendered on visits that would have happened anyway, plus any channel fees. In the illustrative UAE restaurant below, at least 39 of every 100 discounted visits must be genuinely additional to break even on the current meal. With an illustrative 10% channel fee, that rises to 51.

“Additional” matters more than “first-time.” Someone new to your customer database may already have planned to dine with you. A regular can also make an additional visit because of an offer. Neither can be identified reliably from a redemption count alone.

What does the discount actually cost?

Take a casual restaurant selling a meal for AED 120 including VAT. A merchant-funded 25% discount makes the guest's bill AED 90. Because the UAE standard VAT rate is 5% and the merchant funds this price reduction, the restaurant's revenue before VAT falls from about AED 114 to AED 86. UAE VAT rules distinguish merchant-funded discounts from other funding and voucher arrangements; get tax advice for those cases.

Now use costs that are illustrative, not UAE restaurant averages: food at 30% of the full pre-VAT selling price; other costs that rise with each cover at 4%; and a payment fee based on Ziina's published 2.6% + AED 1 transaction price, with two covers sharing the AED 1 fixed fee. The plate and its ingredients do not shrink when the menu price does.

The discounted meal still contributes about AED 44 toward rent, salaried staff and profit if the seat would otherwise be empty. But giving it to someone who would have paid full price gives up about AED 28 of contribution. Displayed amounts are rounded individually; the calculations use the exact underlying amounts.

How many discounted visits must be additional?

The break-even share is:

(Full-price contribution − discounted contribution) ÷ full-price contribution

Using the exact amounts behind the rounded table, the threshold is 39%: roughly 39 incremental visits per 100 redemptions are needed to cover the markdowns on the other 61. If only 30 are incremental, the offer loses about AED 625 per 100 discounted covers on current-meal contribution. If 50 are incremental, it adds about AED 811.

Suppose a separate channel also charges an illustrative 10% of discounted pre-VAT revenue per cover. That removes about AED 9 from every discounted contribution, raising the required incremental share to about 51%. This is a sensitivity test, not a claim about any UAE platform's contract. Fixed subscriptions, extra staffing and campaign costs must be recovered on top of this per-cover break-even.

Why is a quiet lunch different from a full Friday?

An unsold restaurant seat-hour expires; Cornell's restaurant revenue-management work explains why the time attached to a seat matters. On a quiet Tuesday, a genuinely additional discounted diner can add about AED 44 in this example. If Friday is already full and every discounted booking replaces a full-price one, the current-meal contribution falls about AED 28 per cover. A future full-price repeat visit might justify that acquisition cost, but only if it is measured—not assumed.

This article extends the simple “how many more covers?” calculation in DiscGo's UAE F&B 2026 operator report. It asks the more useful question: how many of the people using the discount would not have come without it?

How can an operator find out?

Run the offer in selected quiet lunch periods and leave comparable periods unpromoted. Compare total covers and total contribution, not just discounted covers, across the two groups. If possible, assign offer and holdout weeks in advance rather than choosing retrospectively; seasonality, holidays and paydays can otherwise make a weak offer look strong. Small samples will be noisy, so report a range rather than a precise ROI.

The decision rule is simple: calculate your own two contribution figures, limit the offer to slots with spare capacity, and keep it only when the measured incremental share clears your break-even threshold. A 25% headline says almost nothing until those three numbers are known.