Solo businesses register 10DLC once and move on. Agencies hit a structurally different problem: ten, thirty, a hundred clients, each texting their own customers, each needing to be compliant — and a registration model that was designed around one brand per business. Get the structure wrong and you either cap every client's throughput or create a compliance liability with your agency's name on it.

I work for ReadySMS and we run 10DLC for a lot of agency sub-accounts, so this is the field-tested version.

The core decision: brand-per-client, not one mega-brand

The tempting shortcut is registering one brand — yours — and sending every client's traffic under it. It's cheaper on paper and it's the wrong call for three reasons:

  1. Throughput is per-brand. Carriers allocate daily message throughput by brand trust score. One shared brand means all your clients split one allocation — your biggest client's blast eats your smallest client's speed-to-lead window.
  2. Reputation is shared. One client with sloppy list hygiene drags spam-rate metrics for every client riding the brand. You've built a compliance contagion machine.
  3. Content mismatch risk. Campaigns describe specific use cases. Thirty different businesses' messages under one brand's campaign is exactly the pattern reviewers and carrier audits flag.

The correct structure is one brand per client (their legal entity, their EIN), each with its own campaign. Each client gets their own throughput, their own reputation, and a registration that survives your relationship ending.

The real cost math at N clients

Per client, carrier fees run roughly $10/month for the brand + $20/month per campaign — call it $30/month per client, plus a one-time vetting fee ($40) only where a client actually needs higher throughput (when vetting pays).

At 20 clients that's ~$600/month of registration overhead. The question isn't whether that's a lot — it's who pays it. Which brings us to rebilling.

Rebilling registration defensibly

Registration fees are the easiest line item you'll ever rebill, because they're real, external, per-client, and documented. The standard patterns we see:

  • Pass-through at cost on the invoice ($30/month, labeled "carrier A2P registration fees") — simplest, builds trust, and positions your margin in the messaging rate instead.
  • Compliance-as-a-service markup — e.g. $50-75/month covering registration fees plus your handling of the paperwork, rejections, and opt-out compliance. Defensible because the alternative is the client doing carrier homework themselves.

Either works; what doesn't work is hiding it inside an inflated per-message rate, because sophisticated clients comparison-shop per-message pricing. (The same logic applies to the messaging spread itself — we broke that down in rebilling SMS without churn.)

The onboarding-lag problem (and the fix)

The classic agency complaint: "every new client waits a week before their campaigns can send." That lag is optional. On ReadySMS, a new client sub-account sends immediately on the registered shared pool while their own brand and campaign register in the background — typically approved within 24-48 hours (how the bridge works). Client onboarding day and first-campaign day can be the same day.

Mistakes that quietly cap agencies

  • One brand for all clients — the throughput and contagion problems above. The savings are a rounding error; the ceiling is real.
  • Registering clients under your agency's EIN — ties their compliance standing to you and breaks portability when they leave.
  • Copy-pasting one campaign description across clients — reviewers notice; per-client descriptions with the client's actual use case and opt-in flow approve faster and audit cleaner.
  • Skipping opt-out infrastructure — STOP handling has to be enforced platform-side, per client. On ReadySMS it's automatic on every sub-account; if your current stack leaves it to workflow builders, that's a lawsuit lottery ticket.

Do agencies need a separate 10DLC brand for each client?

Yes, that's the correct structure: each client registers as their own brand (their legal entity and EIN) with their own campaign. It gives every client independent throughput and reputation, and it's what carriers expect — one brand fronting many businesses' traffic is a flag, not a hack.

How much does 10DLC cost per client?

Roughly $30/month in carrier fees per client ($10 brand + $20 campaign), plus an optional one-time $40 vetting fee where higher throughput is needed. Most agencies rebill it as a pass-through or fold it into a compliance-service fee.

How fast can a new client start texting?

Same day on ReadySMS: sub-accounts send on the registered shared pool immediately while the client's own registration processes (brand approval typically 24-48 hours). No onboarding dead-air week.

Can I manage all client registrations in one place?

That's the point of doing this on a platform instead of carrier portals: ReadySMS handles brand + campaign filing per sub-account in-app — including for GoHighLevel agencies, where it installs as a native GHL integration and replaces LC Phone per sub-account.

The agency version of 10DLC done right: brand-per-client, ~$30/month rebilled transparently, registrations filed for you, and zero onboarding lag because the pool bridges the wait. See pricing or run a client's volume through the calculator.