What is a retainer, and how should you structure one?
An ongoing arrangement where a client pays regularly rather than per project. It converts unpredictable project income into recurring revenue — and badly structured retainers are one of the most reliable ways for a service business to work more and earn less.
The three models, which behave very differently:
Access retainer. The client pays to have you available — priority, advice, a response time. You are selling availability, not output, and this is the cleanest model because it does not create an argument about hours.
Capacity retainer. A defined block of time or output each month — so many days, so many deliverables. Clear, and vulnerable to the month where the client wants double.
Outcome retainer. Responsibility for an ongoing result — a maintained system, managed channels, a function delivered. The most valuable and the hardest to scope.
What must be written down:
What is included and explicitly excluded.
Whether unused time rolls over. The default should usually be no, because rollover creates an unpayable liability and an awkward conversation when the client eventually claims six accumulated months.
What happens when the client exceeds it — additional work quoted, or an agreed overage rate.
Response times, and whether that includes out of hours.
A review point, commonly quarterly, where scope and price are revisited. Without this, a retainer silently grows in scope and stays at the original price, which is how the arrangement becomes unprofitable.
Notice period, ideally long enough to replace the income.
Payment in advance, monthly, by standing order or direct debit.
A minimum term, to justify the setup work.
Why they fail: priced from an hourly rate rather than from value, so you are penalised for getting faster; the quiet month prompting the client to question the cost, which is why reporting what was done matters even when little was needed; scope creeping without a review; and becoming over-dependent on one retainer client, which is a concentration risk rather than a stable business.