With a fixed retainer the cost is predictable and the agency can also do the long-horizon work; the work continues even when sales dip. In a commission model payment is tied to results and cash risk is shared, but both sides focus on short-term sales and arguments about measurement surface sooner or later. The difference is which side carries the uncertainty.
Side by side on the same criteria.
| Criterion | Fixed agency retainer | Sales-based commission |
|---|---|---|
| Risk distribution | The risk sits with the business; you pay the fee even if results do not come. | The risk is shared; if there are no sales, the payment stays small too. |
| Incentive direction | Long-term and less visible work also gets done; there is no short-term sales pressure. | It creates a pull toward measurable short-term sales; brand and infrastructure work falls behind. |
| Measurement and attribution | Little argument about measurement; the evaluation is based on the work delivered. | Which sales came from the agency has to be defined clearly, and the attribution rules written into the contract. |
| Budget predictability | The monthly cost is fixed; cash planning is easy. | The cost rises along with sales; in a good month the agency fee can far exceed expectations. |
| Margin impact | As sales grow, unit cost falls; scaling works in the business's favor. | On low-margin products the commission rate can eat the profit; the rate should be discussed on gross profit. |
| Length of the relationship | Suited to long-term work; plans and schedules can be built. | Motivation is high in the short term, but the relationship strains fast when sales fluctuate. |
A fixed retainer is right for work whose results come late, such as brand building, technical SEO, infrastructure setup and content production. This model works if you need to plan a budget and the channel is not producing data yet.
Commission is right when the channel is mature, measurement infrastructure is in place, and sales can be attributed directly. If cash flow is tight and you are looking for a structure that shares the risk, it is workable, especially in marketplaces and performance advertising.
A fixed retainer for work whose results come late and are hard to measure; sales-based commission in mature channels where measurement is in place and the margin can carry the rate.
A fixed retainer is right for work whose results come late, such as brand building, technical SEO, infrastructure setup and content production. This model works if you need to plan a budget and the channel is not producing data yet.
Commission is right when the channel is mature, measurement infrastructure is in place, and sales can be attributed directly. If cash flow is tight and you are looking for a structure that shares the risk, it is workable, especially in marketplaces and performance advertising.
A fixed retainer for work whose results come late and are hard to measure; sales-based commission in mature channels where measurement is in place and the margin can carry the rate.
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