Retainer

What is Retainer?

A retainer is a recurring payment a client makes to secure ongoing access to a service provider's time and expertise. Unlike project-based billing, retainers provide predictable monthly revenue that resembles subscription income for agencies and consultants.

Retainers improve cash flow predictability because revenue arrives on a fixed schedule rather than at project milestones. A client paying $8K monthly on the first of the month creates reliable cash inflow that supports steady payroll and contractor planning.

However, retainer scope creep can make retainers unprofitable. When the work required to fulfill a retainer exceeds the hours or deliverables originally scoped, the effective hourly rate drops without any change in the billing amount. Retainers require ongoing scope monitoring to remain profitable. Retainers share characteristics with MRR in recurring revenue predictability. Review retainer scope monthly against hours or deliverables used. A retainer that drifts out of scope behaves like a discount that compounds every month until margins disappear.

Why it matters

Retainers stabilize agency cash flow but create a false sense of security if scope is not monitored. A full retainer roster with creeping scope can produce predictable revenue and declining margins simultaneously.

Example

How RunwayCal helps

Common mistakes

• 1Not tracking hours or deliverables against retainer scope
• 2Treating retainer revenue as fully available without accounting for delivery costs
• 3Renewing retainers without reviewing profitability trends