The three models
Percentage of ad spend
The fee scales with the budget. It aligns the provider's revenue with your investment, which is sensible when budgets grow with results, and it's simple to administer. The risk is the incentive to recommend more spend; the safeguards are a clear minimum fee, a cap, and reporting that leads with return rather than spend.
Flat monthly fee
A fixed price for a defined campaign scope regardless of budget. Predictable, and free of the spend incentive. The trade-off is that a flat fee can under-serve a growing account or over-charge a small one, so the scope — number of campaigns, creative volume, testing cadence — must be written down.
Hybrid
A base fee that covers setup, creative, and reporting, plus a smaller percentage of spend. Increasingly common because it funds the fixed work while sharing in growth. Hybrids need the clearest contracts of the three.
What the fee should cover
- Strategy and audience design — who the campaigns target and why.
- Campaign setup, pixel and conversion tracking, and account hygiene.
- Creative testing — which usually depends on content production that may be priced separately.
- Ongoing optimization on a stated cadence.
- Reporting that connects spend to leads, revenue, or return on ad spend.
Questions that expose the real price
- Is creative production included, or billed separately per asset?
- Is there a minimum fee, and at what spend level does the percentage model become cheaper or more expensive than a flat fee?
- Who owns the ad accounts, pixels, and audiences if we leave?
- What is reported — spend and clicks, or cost per lead and return?
Run your numbers first
Before you accept any fee model, know your breakeven. The CPC/CPA breakeven calculator turns customer value and conversion rates into the most you can pay per lead and per click; the ROAS calculator shows the return your margin requires. A management fee that makes sense at one return can be unaffordable at another.