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A retainer turns unpredictable project work into steady, recurring income — a client pays a fixed monthly fee for a guaranteed block of your hours. This works out the price from your hourly rate, the hours you'll include, and a small commitment discount.
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A retainer is the simplest path from feast-or-famine project work to income you can actually plan around. Instead of quoting each job from scratch, you and the client agree on a fixed monthly fee for a reserved block of hours. They get priority access and a predictable bill; you get recurring revenue that lands whether or not a new project happens to come in that month. The math is refreshingly direct:
The discount is the part people overthink. It exists for one reason: the client is committing to pay you every month, sight unseen, so a small price break is fair compensation for that certainty. But keep it small — 5% to 15% is plenty. A retainer should be a touch cheaper per hour than ad-hoc work, not a fire sale. If you discount 30% or 40%, you've quietly turned your best, most reliable income into your worst-paid work.
The overage multiplier protects the other side of the deal. The included hours are a cap, not a ceiling on the client's appetite — months will run long. Billing over-cap hours at 1.0× (your normal rate) is the gentle option; 1.25× to 1.5× prices in the reality that unplanned, over-the-cap work is more disruptive and worth more. Either way, write the overage rate into the agreement so a busy month never turns into an awkward conversation.
That's a policy choice, and it changes the deal's economics. The most common — and most retainer-friendly — approach is use-it-or-lose-it: unused hours expire at month's end, which is exactly what makes the revenue predictable for you. If you let hours roll over, you're effectively giving the client a bank of your time, and a quiet month followed by a heavy one can blow past your real capacity. This calculator prices a clean, non-rolling monthly block; if you offer rollover, treat the number here as your floor and tighten the terms in writing.
Most freelancers offer 5–15% off their standard hourly rate in exchange for the client's monthly commitment. The discount is payment for predictability, not a race to the bottom — a retainer should still be among your better-paid work. If you find yourself discounting 25% or more, you're underpricing guaranteed income, which is the most valuable kind.
Those extra hours bill at your overage rate — your normal hourly rate multiplied by the overage multiplier you set (often 1.0× to 1.5×). Spell the overage rate out in the agreement up front. That way a heavy month is just a line item, not a renegotiation, and the client can decide whether to approve the extra hours or wait for next month's allotment.
Many seasoned freelancers move to value- or scope-based retainers — a flat monthly fee tied to outcomes or a defined deliverable set rather than a literal hour count. Even then, the hourly math here is your floor: it tells you the minimum a retainer must earn so you're not quietly working below your rate. Price the value, but check it against these numbers before you sign.
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Find the hourly rate your retainer's included hours should be built on.
Bill the monthly retainer (and any overage) as a clean PDF.
Retainer paid late? Work out exactly what the client now owes.