The short answer
A retainer is a recurring, usually monthly fee for ongoing work, as opposed to a one-off project. For an agency, it means predictable revenue, but only as long as the client stays. Retainers usually end because the client no longer sees the value. You make them predictable with a minimum term, an early proof of value, regular results meetings and a renewal conversation before the term runs out.
What a retainer is
With a retainer, the client pays a fixed monthly amount for a defined, ongoing service: campaign management, content, consulting, ongoing support. According to SparkToro, just under half of the agencies surveyed have an average monthly retainer between $1,000 and $5,000, and 86% are under $10,000.
Month-to-month or minimum term?
| Month-to-month | Minimum term (e.g., 6 or 12 months) | |
|---|---|---|
| Barrier to sign for the client | Low | Higher |
| Predictability for the agency | Low | High |
| Time to show impact | Often too short | Enough |
| Risk | Cancellation before the first result | Cancellation at the end of the term |
Month-to-month contracts make it easier to sign, but they also let the client walk away exactly when no result is visible yet. A minimum term buys time for the work to show impact. In an ongoing pilot with a Meta ads agency, monthly contracts were replaced with fixed terms: 75% of new contracts run six months, 25% run twelve. Together with a rebuilt offer, churn dropped from 35% to 20% (single case, anonymized).
Why retainers end
According to SparkToro, 25% of the agencies surveyed typically work with a client for less than twelve months, while 31% work with clients for more than three years. What separates the two groups rarely lies in sales. It lies in what happens after. The most common causes:
- The value isn't visible. In the 2023 Setup survey, this was the most common reason for switching agencies, at 53%.
- Delivery doesn't match the promise. Clients ranked delivery as the second most common reason. Agencies themselves put it in ninth place.
- Nobody talks about the next phase. The retainer runs out because no renewal was prepared.
- Your point of contact changes. The new decision-maker doesn't know the value delivered so far and questions the spend.
Making renewals predictable
- Put impact in the contract. Agree on how both sides will measure success after three and after six months.
- Schedule the first proof of value. See the client onboarding checklist.
- Talk about results every month. Keep it short, with numbers and a next step.
- Prepare the renewal six weeks ahead. Bring a look back, results and a proposal for the next phase, with expanded scope where it makes sense.
- Onboard new contacts. When the person on the client side changes, walk them through the value delivered so far.
Here's what a longer relationship means in dollars: at $1,500 a month, a client who cancels after three months brings in $4,500 in revenue. One who stays twelve months brings in $18,000. The formula is in the article on customer lifetime value.
For your business
How long do your retainer clients stay, and why? The BiasGap self-check shows in seven questions where your biggest lever is after the sale.
FAQ
What minimum term makes sense for an agency retainer?
Long enough for a visible result to show up within the term. For many services, that's six months. For long-term work like SEO, it's closer to twelve. Offering both terms, as in the pilot described above, lets the client choose.
How do I announce a retainer increase?
Pair it with a review of results and an expanded scope, ideally in the renewal conversation. An increase without additional value comes across as a price hike.
What's the difference between a retainer and a project?
A project has a fixed scope and an end date. A retainer pays for ongoing work. Retainers bring predictable revenue, but only if the client keeps experiencing the value.
Check your own business
How far apart are your self-assessment and what actually happens?
The BiasGap self-check shows you in seven questions, no sign-up. Or book a free intro call to find out whether a Post-Sale Revenue Audit would pay off for you.
Adrian Brzenska
16 years in sales, from €500 deals to six-figure ARR, and a performance agency of his own. With the Post-Sale Revenue Audit, he shows agencies, consultants and coaches where revenue leaks after the sale.
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