There are four common ones, and each has its place.
A fixed retainer gives you cost certainty and funds ongoing strategy, management and reporting. It works well when the scope is clearly defined, though you need to know exactly what's included, because a retainer with a vague scope can quietly become passive. There's no built-in incentive to do more than the minimum.
A percentage of media spend means the agency earns a set percentage of the advertising investment. It's the base model across the independent agency world, particularly for start-ups, because it's simple to account for. The catch is that as the campaign grows and the agency's demands increase, the percentage stays fixed while the workload doesn't, and service levels can start to slip.
A hybrid combines a base retainer with a percentage of spend, and it's the arrangement we see most often. It should flex with the scope involved, whether that's digital only, traditional only, or a fully integrated multi-channel campaign. Whatever shape it takes, it needs to be agreed upfront, simple and visible.
Performance-based fees sound appealing because client and agency appear perfectly aligned. They work only when the result can be measured properly, and the agency has meaningful control over it. An agency can generate demand, but it doesn't control your pricing, stock availability, website experience, or sales team.
There's no perfect model. The questions worth asking are whether the incentives are aligned, whether the scope is clear, and whether the fee is visible.
Everything.
The total budget. The amount committed to each channel. The actual negotiated rates. The buying schedule. The planned audience delivery. And what the agency is being paid.
For digital channels, you should have appropriate access to the platform accounts and be able to reconcile actual media spend, ideally through a client dashboard. For traditional media, you should receive the schedule, spot/placement rates, placement details, and any negotiated added value in writing.
Media, agency fees, creative costs, technology fees and third-party expenses should all be separated and itemised.
It sits wherever an agency can receive value from a media owner that you can't easily see. Volume rebates, trading incentives, non-cash benefits, undisclosed mark-ups and principal-based buying all fall into that category.
It’s important to note that none of those arrangements is automatically improper. The issue is disclosure, because you should never have to guess whether your agency is acting solely as your agent, or whether it also has a commercial interest in what it's recommending.
Principal-based buying is the one worth understanding properly. In a principal media model, the agency (normally hold cos) buys media inventory itself and resells it to clients at an undisclosed markup, so the agency becomes as much a media owner as a media buyer.
Some of the major holding groups run their own version, and while research by the ANA in the United States found that nine in ten marketers there now doubt whether their agency's recommendations are genuinely in their best interest, and while Australia hasn't yet reached US or UK levels of principal media, both of those markets saw it grow gradually while governance failed to keep pace.
For an independent agency like ours, this simply isn't a question. We hold no inventory, so we have nothing to push. For anyone weighing up a larger group, the fair question is whether principal trading is part of the arrangement, and whether you can opt out of it.
Every client loves the idea of added value, and it looks fantastic in a proposal; however, not all added value is created equal. Unless it's documented, scheduled, delivered and reported, it has no real value at all.
"We'll throw in a few extras" is worth precisely nothing.
The questions worth asking your agency:
A good agency shouldn't become defensive about any of that but should welcome the questions and answer them in writing.
You own your advertising accounts, analytics properties, pixels, audiences and business data. Your agency needs access to do the work, of course, and you should never lose your history, your learnings or your ability to trade simply because you change agencies.
Creative ownership is more complicated, because it depends on the production agreement and whether third-party talent, music, footage or licences are involved. The fix is to document it at the start: what you own outright, what is licensed, and for how long. Set the agreement up as though you know it's going to end bitterly, and you'll rarely regret it.
Exit terms should also cover handover, removal of access, transfer of files and final reporting. A breakup might be uncomfortable, though it shouldn't become a hostage negotiation.
It varies widely with scope, spend level and channel mix, which is why a percentage figure quoted in isolation tells you very little. A better test is whether the total cost of working with the agency is visible to you, and whether the scope attached to that fee is written down.
Yes, and a reasonable agency will agree. The right to reconcile spend against supplier invoices is standard practice for larger advertisers and worth including regardless of your size.
