What Is a Retainer Fee and How Do You Calculate It?
A retainer fee is a fixed monthly payment a client makes to reserve your time and expertise on an ongoing basis. Unlike project-based billing — where you price a defined deliverable — retainers compensate you for committed availability: the promise that when the client needs you, you are there. This structure benefits both parties: the client gets priority access and predictable costs; you get recurring income and reduced administrative overhead.
The standard retainer formula is straightforward:
Retainer Formula
Monthly Retainer = (Hourly Rate × Monthly Hours) × (1 + Premium%)
Example: $120/hr × 30 hrs × 1.15 = $4,140/month
The premium (typically 10–25%) is the critical variable most freelancers underuse. It accounts for the value you provide beyond raw hours: priority scheduling, faster turnaround, institutional knowledge, and the cost of not taking higher-paying projects during your reserved time.