When the relationship that worked stops working
Most agency relationships start because a specific need is identified at a specific moment: a brand needs building, a campaign needs running, a capability gap needs filling. The agency that is selected is the best available option for that specific need at that specific time. The relationship is good, the work is good, and the business progresses.
Two years later, the business has changed. The stage has shifted. The marketing needs are different. The agency, which has continued doing what it was originally hired to do, is still performing adequately against its original brief. But that brief may no longer match what the business actually needs. The relationship has become inertial rather than strategic, maintained because changing it is effortful rather than because it is the best available option for the business as it now stands.
This is one of the most common and most quietly expensive problems in marketing: a continued investment in a relationship that is delivering what was asked for three years ago, not what is needed now.
The signals that the fit has changed
The relationship has likely drifted from fit to inertia when several of the following are true. The agency's work feels competent but not particularly energised. The most experienced people from the agency are not regularly assigned to the account. The strategy conversations have become less frequent and the execution conversations more frequent. The agency's recommendations tend to be conservative, within established parameters rather than genuinely pushing thinking. Results are adequate but not improving over time.
None of these individually is a definitive signal. Together, they describe a relationship that has matured beyond the productive collaboration stage into something more transactional. Transactional relationships are not necessarily bad, but they should be priced accordingly and evaluated without the premium attached to strategic partnerships.
The more significant signal is when the agency's expertise does not match the business's current priorities. An agency that was hired for brand building work but whose team does not have strong digital analytics capability is a misfit for a business that has moved into a data-driven performance marketing phase. Recognising that the expertise mismatch is structural, not a performance problem that can be addressed within the existing relationship, is an important distinction.
The question is not whether the agency is doing its job well. The question is whether the job it is doing is still the right one for where the business is going.
The annual agency review
An annual structured review of every significant agency relationship, conducted with the same rigour applied to other significant business investments, is the practice that prevents inertial relationships from persisting too long. The review should assess three things: whether the work produced has delivered on the objectives it was commissioned against, whether the agency's capabilities still align with the business's marketing priorities for the coming year, and whether the commercial terms remain appropriate given the current scope and the market.
The review should be conducted by the marketing leader, not delegated to the day-to-day account manager. It should include an honest conversation with the agency about the quality of the relationship from both sides. And it should produce a clear output: continue as is, renegotiate scope or terms, shift the relationship to a different focus, or begin a search for a different provider.
What good agency fit actually looks like
A well-fitting agency relationship, at any stage of a business's growth, has specific characteristics. The senior people from the agency are genuinely interested in the business's strategic challenges, not just in executing the brief. The agency brings its own perspective and occasionally pushes back on the brief when they think there is a better approach. The relationship feels like a genuine collaboration rather than a client-vendor transaction. And the agency's expertise is genuinely ahead of the internal team's in the areas where they have been engaged, providing real capability lift rather than just execution capacity.
How to change an agency relationship without damaging it
Changing or ending an agency relationship is one of the things marketing leaders avoid most. The relationship has history. The agency has done good work. The transition cost is real. And the conversation is uncomfortable. But a well-managed transition, conducted with clarity and respect for the relationship that existed, is entirely possible and is usually better for both parties than a relationship that continues past its optimal point.
The most important thing in managing a transition is honesty about the reason. An agency that is told clearly that the business's needs have evolved and the fit has changed can plan accordingly and maintain a constructive relationship. An agency that is given vague feedback, or that is allowed to believe the relationship may continue when it will not, cannot. The short-term comfort of avoiding the conversation typically produces a worse outcome on both sides than the short-term discomfort of having it clearly.
The relationship worth investing in
The agency relationships that produce the most value over time are the ones that are reviewed honestly and consistently, renegotiated when the fit has shifted, and built on the specific expertise the business needs at each stage rather than on the history of what was needed at a previous one. That requires more active management than most agency relationships receive. It is the management that produces the returns.