Retainer, percentage of spend or performance fee: which agency pricing model fits you?

Every pricing model steers your agency's behavior in a different direction. Here is how to read the incentives behind retainers, spend percentages and performance fees, and pick what fits your stage.

No pricing model is objectively the best. A retainer, a percentage of ad spend and a performance fee each steer your agency's behavior in a different direction. So the right question is not which model is cheapest, but which incentive you want to build into the partnership and which one fits the stage your brand is in.

How does the retainer model work and what is the incentive?

With a retainer you pay a fixed monthly amount, independent of spend and results. The big advantage is predictability. You know your cost, the agency knows its income, and nobody has to negotiate extra work halfway through the month. That calm is worth more than founders tend to admit, especially while you are still building your product and team.

The incentive sits under the hood. An agency on retainer earns the most from clients that take the least time. At a good agency, that translates into tight processes and senior people on your account. At a mediocre agency, it translates into standstill: the same campaigns, the same reporting, as little movement as possible. A retainer therefore only works when you fix the rhythm alongside the fee. How many new creatives per week? How many tests? Who documents the learnings? Without those agreements you are buying presence instead of progress.

What does a percentage of spend do to the relationship?

Under this model you pay a monthly percentage of your ad spend as the fee. It feels logical: budget grows, work grows, so the fee grows along with it. And unlike a bare retainer, the incentive at least points toward growth, because an agency that lets your account shrink watches its own revenue shrink.

Just look closely at what is actually being rewarded. The agency earns from your spending, not from your return. Every extra euro of spend is profit for the agency, even when that euro produces nothing for you. In practice you recognize this in conversations that keep landing on the same conclusion: the budget needs to go up. Sometimes that is completely justified. But you need to be able to check whether the scaling step is backed by marginal results, or mostly by next month's invoice. Ask what evidence sits under every proposed budget raise.

When does a performance fee work, and when does it backfire?

A performance fee ties compensation to results, for example a percentage of the revenue attributed to ads. On paper it is the fairest deal: the agency only earns when you earn. In practice everything depends on the measuring stick, and that is where it usually goes wrong.

• Which attribution applies? Platform numbers structurally overstate what ads contribute, so a fee on platform ROAS also rewards revenue that would have come anyway.
• Does existing revenue count? A fee on all revenue pays the agency for customers who were coming back regardless.
• What happens in a bad month? An agency earning nothing quietly stops investing in your account.

Performance fees also push agencies toward safe choices: retargeting, proven winners, everything that measures cleanly. The exact work that builds long term growth, like testing new angles on cold audiences, becomes unattractive because it hurts the fee in the short term. That is why this model tends to work best in hybrid form: a lower base fee that covers fixed costs, plus a bonus on pre-agreed goals with a clearly defined measurement method.

You never pay an agency just for work. You pay for the incentive the two of you build into the contract.

Which model fits which stage?

If you are spending roughly €15K to €20K per month and want to head toward €150K to €200K, you are in the stage where creative volume and testing rhythm make the difference. A retainer with hard output agreements fits well there: you are buying capacity and rhythm, not loose hours. If you are already running high budgets on a proven machine, a spend percentage or hybrid model can work fine, because budget growth then genuinely coincides with growth in the work.

More important than the model is the question underneath it: where do the results come from? The fee is rarely the real bottleneck. The bottleneck is an agency delivering media buying without a strategy behind the creatives, which makes every model expensive. So in every intro call, ask how the agency generates new concepts, how many tests run weekly, and how learnings from one concept feed the next testing round. An agency with sharp answers to those questions is a better deal under any pricing model than a cheap agency without a plan.

Conclusion

Retainer, spend percentage or performance fee: every model can work and every model can derail, depending on the agreements around it. Choose based on your stage, think through the incentives and fix the testing rhythm instead of just the number. The real return does not come from the pricing model but from the strategy behind your creatives: which angles you test, in what order and why. That is the foundation we build daily for B2C brands that want to scale. Curious what that looks like for your brand? Book a call and we will gladly take a look with you.