Quick answer: a sonic branding retainer covers maintenance of decisions already made — a capped block of hours, guardianship of the guidelines, file custody, and adaptations of assets that already exist. Anything that requires a new creative decision, a new surface or a new licence stays billable as a project. Write that boundary into the agreement before the first month runs, because the boundary is the thing the client is actually paying to have held.
The sound logo shipped. The invoice cleared. Three weeks later the message arrives: "quick one — can you make a shorter version for the podcast?"
That message is the whole business. Answer it well and you have a client for two years. Answer it by reflex, for free, four times in a row, and you have taught the client that your time is a customer service line. A retainer exists to price that message before it is sent.
This is the sequel to turning a sound pack into a sonic branding retainer, which covers how you get into the arrangement. This one covers what goes inside it.
Why retainers drift
A sonic branding project has an obvious edge. There is a brief, a set of deliverables, a delivery date. Everyone knows when it ends.
A retainer has no edge unless you draw one. Three forces push against it.
Requests arrive one at a time. No single ask looks big enough to invoice. A 6-second cutdown takes twenty minutes. So does the next one. By month four you are running an unpaid service desk on a monthly fee that was priced for two hours of consultation.
The client's team changes. The marketing lead who sat through the brief leaves. The replacement inherits a folder of WAV files and no idea what the rules were. They ask for things the original brief already answered, and they ask you rather than reading the document.
New surfaces appear faster than the identity was designed for. The brand launches a mobile app, a podcast, a conference stand. Each one needs sound. None of them were in the original scope, and each one arrives framed as a small adaptation.
None of those forces is bad faith. They are what happens to a sonic identity that is actually being used. The failure is not the client asking. It is the agreement having nothing to say about it.
The one rule that draws the edge
We have already covered why a brand pays for a retainer at all: availability, consistency, and one accountable ear on the identity. That is the case for the arrangement. What that article does not do is tell you where the line sits once the arrangement is live.
Here is the line, and it holds in every case we have run:
A retainer maintains decisions that are already made. A project makes new ones.
Re-cutting a sound logo to 6 seconds is maintenance. The pitch, the timbre and the shape were decided in the original brief; you are executing them at a different length. Writing a UI sound set is not maintenance. Nothing about it was decided, so someone has to decide it, and deciding is the expensive part.
Apply the rule before you look at how long a task takes. Duration is a trap: a new decision can be made in forty minutes and still be worth four figures, because what the client is buying is the judgement, not the render. Every scope argument we have seen came from someone pricing the render.
What belongs inside the fee
Keep this list short and finite. A retainer with eleven inclusions reads as generous and behaves as a trap.
A capped block of hours. Four, eight or sixteen per month depending on the tier. State the number. State that unused hours expire at month end, or roll over once and no further.
Adaptations of assets that already exist. Cutdowns, loops, alternate lengths, format conversions, level-matched exports for a new platform. The creative decision is already made; you are re-cutting it.
Guidelines guardianship. One review pass on anything the client's agencies or in-house team produce with the sonic assets. You say yes, no, or here is what to change. This only works if the sonic brand guidelines document exists and is current, which is why writing it is project work and keeping it current is retainer work.
One scheduled call per month. Fixed length, fixed slot. This is where the "quick ones" go instead of into your inbox at 22:40.
File custody. You keep the sessions, the stems and the exports available and current. Named, versioned, retrievable within a working day.
Small corrective work. A mix that reads too bright on a phone speaker. A file that clipped on export. Fixing your own delivery is never billable and saying so builds trust.
That is the whole list. Six lines. A client can read it in thirty seconds and know what they own.
What stays billable
The complementary list matters more, because it is the one you will point at. The rule underneath it: anything that requires a new creative decision is a project.
A new asset in a new register. A brand track, a UI sound set, an in-store loop. These need a brief, references and rounds. They are not adaptations.
A new territory or a new market. Localised voice, a regional cut, a different language. New decisions, new approvals, new licensing.
Extending the identity to a surface that was not scoped. An app, a game, a hardware product. See the sound logo rollout for why each touchpoint is its own piece of work.
A revision round on a new piece. Revisions on new production follow the same revision round structure as the original project, with the same count and the same cutoff.
A licence extension. Broadcast, paid media, a territory the original grant did not cover. Licensing is priced on use, not on hours, and it does not dissolve into a monthly fee. Worth reading alongside how royalties work in a buyout.
Ongoing web audio work. Keeping a site's audio layer alive across releases is engineering upkeep: the player that has to keep running while visitors move through the site, the mute state, the mobile behaviour. It can sit in a retainer, but only as its own line with its own hours. Do not let it hide inside "adaptations".
How to price it
Two anchors work, and they check each other.
Anchor one: a share of the project fee. A retainer commonly lands between 8% and 15% of the original sonic identity fee, per month. A €12,000 identity supports a €1,000 to €1,800 monthly retainer. Below 8% you are not reserving capacity, you are discounting access.
Anchor two: your hourly rate on the capped block, plus a premium for reservation. Take the hours, multiply by your rate, add 20% to 30% because you are holding the slot whether or not the client uses it. If the two anchors disagree by more than a third, one of your numbers is wrong. Our sonic branding pricing guide covers the underlying rate work.
Three tiers is the right number. One tier reads as take it or leave it. Five reads as a pricing page nobody finishes.
Custody — 4 hours/month. File custody, guidelines review, one call. For an identity that has shipped and has a low release cadence.
Active — 8 hours/month. Everything above, plus adaptations and platform exports. For brands running regular campaigns across several channels.
Embedded — 16 hours/month. Everything above, plus priority turnaround and roadmap input. For in-house teams producing continuously.
Bill monthly, in advance, same date every month. The payment discipline from invoicing a sonic branding project applies unchanged: terms in writing, a stated late position, no work in a month that has not been paid for.
The language that holds the line
Four clauses do the work. Keep them in the retainer agreement, not in an email.
The hours clause. "The monthly fee reserves N hours of studio time. Hours are tracked and reported monthly. Unused hours expire at the end of the month."
The definition clause. "Adaptation means a modification of an existing delivered asset. Creation of a new asset, or extension to a surface not listed in Schedule A, is scoped and quoted separately."
The overflow clause. "Work beyond the reserved hours is quoted in advance at the standard rate and begins on written approval." The words in advance prevent the awkward conversation entirely.
The notice clause. Thirty days either way, minimum term of three months. Shorter than three and the client uses you as an on-demand studio at a discount.
Send the monthly hours report even when the client used two of eight. Especially then. An unused retainer that nobody reports on gets cancelled in the next budget review. A reported one gets renewed, because someone can see the guardianship happening.
What should trigger a re-scope
Set the review at six months, and re-scope early if any of these appear.
The client has overrun the hours three months running.
A new surface has entered the brand and stayed.
The team you briefed has fully turned over. Rebrief them, and bill the rebrief or fold it into the review.
The guidelines have not been updated in a year while the identity has kept growing. That gap is where the sound drifts.
Re-scoping upward is a normal, healthy conversation. Absorbing the overrun silently for a year, then raising it once, is the conversation that ends the relationship.
Frequently asked questions
Do I need a retainer for every sonic branding client?
No. Retainers fit clients who ship continuously. A brand that launched an identity and will not touch it for two years does not need one, and offering it anyway makes the whole offer look padded. Offer file custody alone instead.
What if the client uses none of the hours?
That is the arrangement working as designed. You held the capacity. Report the hours, note what you reviewed, and let the unused block expire as stated. If it repeats for three months, propose a smaller tier before they propose cancelling.
Should a retainer include licensing?
No. Licensing is priced on use and territory, not on time. Keep the two instruments separate or you will find you have granted broadcast rights for the price of eight hours.
How long should the minimum term be?
Three months. Long enough to cover onboarding and one real cycle of work, short enough that the client does not need a procurement process to say yes.
Who owns the session files during a retainer?
You do, unless the original agreement transferred them. Custody is a retainer service, not a transfer of ownership. Make that explicit — it is the single clause clients most often assume in their own favour. The sonic starter kit documentation is what they own, and it should be enough for them to operate without you.
Go further
How music producers turn a sound pack into a sonic branding retainer →
How to invoice a sonic branding project without chasing the payment →
How to keep audio playing while visitors move through your site →
Running a sonic identity that keeps growing? If the requests have started arriving one at a time and nothing is priced, that is the moment to scope the arrangement properly.
