A retainer isn't just a bundle of hours sold in advance — it's reserved capacity. The client is paying to guarantee your availability, so you price it from a monthly block of hours at your hourly rate, and you keep the fee whether or not they use every hour. Done right, a retainer is the most stable income a freelancer can have.
The simplest, soundest retainer is a fixed number of hours per month at your established hourly rate. If you haven't set that rate yet, do it first — see how to set your freelance hourly rate. Decide how many hours a month the client's needs realistically require, multiply by your rate, and that's your baseline monthly fee.
| Monthly hours block | 20 |
| Your hourly rate | $104 / hr |
| Baseline monthly retainer | $2,080 / mo |
| If the client uses only 14 hours | still $2,080 |
| Your effective rate that month | ~$149 / hr |
This is the part freelancers new to retainers get wrong. You've reserved 20 hours of your month for this client. That capacity is gone whether they use it or not — you turned away or deprioritized other work to hold it. So if they only need 14 hours in a given month, you still earn the full fee; you sold availability, not a punch card. The protection runs the other way too: cap the hours, and anything well beyond the block is billed separately or rolls into next month by prior agreement, so a heavy month doesn't quietly eat your time for free.
There's a reasonable case for either. A small discount versus your hourly rate can reward the client for committing to predictable, recurring work — and predictability is genuinely valuable to you. A small premium can be justified because you're guaranteeing priority access and reserving capacity. Pick one deliberately; just don't discount so heavily that the stability isn't worth it. Many freelancers price retainers at their normal rate and let the guaranteed income be the win.
A clean retainer agreement states: the monthly fee, the hours included, what happens to unused hours (typically they don't roll over — that's what protects your income), how overage is handled, and the notice period to end it (30 days is common). Clear terms keep a good recurring relationship from drifting into resentment on either side.