What a media-buying fee does to your break-even ROAS

Agency and media-buyer fees are usually quoted as a percentage of ad spend. That makes them easy to compare and easy to underestimate. Here is exactly how a fee moves your break-even ROAS, and the lift an agency needs to deliver to pay for itself.

How media buyers are usually paid

There are three common structures for paying an agency or freelance media buyer:

A percentage of ad spend. Typically somewhere around 10–20%, charged on everything spent.
A fixed monthly retainer. The same fee whatever the budget.
A hybrid or performance fee. A smaller base plus a share of revenue or profit above a threshold.

Each affects your break-even ROAS differently, and it pays to know how before you sign.

A percentage fee works like a tax on spend

A 12% fee means every AED 1,000 of ads really costs AED 1,120. Like VAT on ads, it rides on every dirham you spend, so it raises break-even at every budget and raises the floor, the lowest ROAS that could ever work.

A fixed retainer is different. It is a fixed cost, like rent. It raises break-even most at small budgets and matters less as spend grows, and it does not move the floor at all.

A worked example

A Dubai beauty store sells at an average of AED 220 with a 58% gross margin. After AED 20 delivery, 2.9% payment fees and 5% refunds, each order leaves AED 94.84, a contribution margin of 43.1%. It has AED 25,000 of fixed costs a month and pays 5% VAT on its ads.

Running its own ads, it spends AED 60,000 a month at 3.60x. Break-even at that spend is 3.40x, and the month makes AED 5,116.

Now suppose it hands the account to an agency charging 12% of spend, and the agency matches exactly the same 3.60x:

ROAS chart for a Dubai beauty store: with a 12% agency fee, break-even at AED 60,000 a month rises to 3.68x, so the same 3.60x ROAS becomes a loss of AED 2,084. — The dashed line is break-even with a 12% fee. At AED 60,000 a month it rises from 3.40x to 3.68x, and the same 3.60x ROAS now loses AED 2,084. Click or tap the chart to enlarge it.

The fee is AED 7,200 a month. Break-even rises from 3.40x to 3.68x, the floor from 2.44x to 2.71x, and the month goes from a AED 5,116 profit to a AED 2,084 loss.

The fair question: does the agency earn its fee?

That example assumes the agency achieves nothing more than the store did alone. That is rarely the reason to hire one. The useful way to read the numbers is as a hurdle: at this budget, a 12% fee pays for itself if the agency lifts ROAS by more than 0.28, from 3.40x to 3.68x just to stand still.

A good media buyer often clears that easily, through better creative, structure and testing. A mediocre one does not. Either way, you now know exactly what "better" has to mean.

Which fee structure suits you

Percentage of spend is simple, and scales with the work. But it rewards spending, not profit, and it raises your floor.
A fixed retainer leaves your floor alone and gets cheaper per dirham as you scale. It can be expensive at small budgets.
Performance fees line the agency up with results, if you define the result as profit rather than revenue.

Whatever you choose, put it into your break-even: a percentage in the agency fee field, a retainer in your fixed costs. Then judge the agency against the line that includes its own fee. For a closely related 5%, see VAT on Meta ads in the UAE.

Add your agency fee to your break-even

Every figure in this article comes from the ROAS Chart calculator, and the screenshots show it with the same numbers. The formulas are written out on the math behind it.