You approve the retainer in January.
By June you can see what the agency produced. Campaigns are live. Pages are ranking. Reports arrive on schedule and the numbers in them go up.
What you often cannot see is what any of it returned. And the invoice did not move either way.
A Retainer Prices Capacity, Not Return
A monthly retainer buys a defined scope of work. Strategy time, media management, creative production, content, reporting. Both sides agree the fee before anyone knows what the work will produce, and the fee holds regardless of what it produces.
That structure does not change when the quarter delivers 200 qualified leads instead of 20. The agency’s revenue from your account is settled on the day you sign.
There are sound reasons this model dominates. Predictable revenue lets an agency hire senior people and keep them on your account. Predictable cost lets a CFO plan. Neither side spends the year renegotiating. For work that compounds slowly, a retainer is often the only sane way to fund the first six months, when the spend is real and the return has not arrived yet.
The trade sits in what the model leaves open. You have certainty on the cost. You have no certainty on the return. Both of those sit on your side of the table.
Your cost is decided in January. Your return is decided in December.
That asymmetry used to go unexamined. It no longer does. The CMO Survey found that demonstrating impact on financial outcomes is now the top challenge marketing leaders name, and 63% report increased pressure from their CFO, up from 52%. Gartner’s 2026 CMO Spend Survey puts marketing budgets at 7.8% of company revenue, close to a multi-year low, with 62% of CMOs saying that missing growth targets this year would trigger budget cuts next year.
The consequence of a flat year lands entirely on the client. The fee structure does not register it.
The Market Has Already Noticed
This is not a fringe position held by agencies looking for a new pitch. The buyers moved first.
The World Federation of Advertisers and MediaSense surveyed more than 80 multinational companies representing over $60 billion in advertising spend. Three out of four said they intend to change their agency remuneration model within three years. 74% said they want compensation better aligned to business performance. 58% plan to increase the share of their spend paid on output or outcome rather than time.
Set the first three figures against the last one and the real problem shows itself. Appetite is close to universal. Adoption is close to nothing. Roughly half of advertisers apply some performance incentive, usually a bonus bolted onto a fee, but the number who pay on value created sits at 4%.
The gap is not reluctance. It is measurement.
What the Structure Rewards
A retainer pays for continuity. The month a campaign gets rebuilt from the ground up and the month it gets maintained produce the same invoice.
Nothing in that arrangement prevents good work, and plenty of agencies do excellent work on flat fees. But nothing in it requires good work either. When a client asks what changed this quarter, the agency’s own economics offer no answer, because the agency’s economics did not change.
Ask a different question and the structure becomes visible. What happens to your agency if this program doubles your qualified pipeline? Under a flat fee, nothing. What happens if it produces nothing for eight months? Also nothing.
An agency paid the same in both cases has no financial stake in which one occurs. That is not an accusation about anyone’s character. It is a description of a contract.
An agency with no stake in the outcome will still tell you it cares about the outcome. Only one of those is enforceable.
What a Connected System Actually Produces
The reason this argument matters is the size of the number on the other side.
BW Law came to GrowME in April 2024 as a two-lawyer criminal defence firm in Edmonton with a new website and effectively no organic visibility.
The firm’s caseload came through referrals. The stated goal was one new case a week.
Paid search went live first and brought in qualified demand immediately. SEO ran in parallel, building local visibility, intent-matched practice-area pages, and authority from a standing start.
Seven months later, the firm had grown from two lawyers to seven.
One case a week stopped being the goal a long time ago. The full breakdown of the budget, the channel split, and the search visibility behind those numbers sits in the case study.
What a Shared-Upside Model Requires
Run the arithmetic on a fixed fee against a result like that. At $5,000 a month, an agency earns $60,000 over a year, whether the program returns six times the spend or none of it. The client’s outcome ranges across an order of magnitude. The agency’s outcome is one number wide.
A shared-upside model closes that gap. A minimum retainer covers the real cost of execution: the team, the media management, the production. Above that floor, the agency earns a percentage of the revenue the system generates. The floor keeps the work properly resourced. The share puts the agency’s income on the same curve as the client’s.
This only works under conditions most companies have not built yet. Before anyone signs, five things have to be true.
Where those conditions are missing, a flat fee is the more honest instrument. Say so, price the work properly, and build the measurement layer first.
The model also assumes one partner is accountable for the full path from strategy to revenue. Splitting a percentage across four vendors who each optimize their own slice reproduces the problem it was meant to solve.
The Question Worth Asking
You do not need to restructure your agency relationship this quarter to get value from this. You need one answer.
Ask your agency what changes for them if the next twelve months go extraordinarily well.
If the answer is a renewal conversation and a case study, you have found the structural limit of the relationship. Their upside is your goodwill. That is a weaker instrument than a contract.
If the answer involves their own economics moving with yours, you are working with a partner who has priced their confidence.
At GrowME the position is straightforward. If we do not believe the work will produce a return worth sharing, we should not take the engagement. When our clients win, we win. We would rather write that into the agreement than into the pitch deck.
