Automating Client Onboarding and AML Checks in an Accounting Firm: London 2026

The verdict in three sentences

Client onboarding is the most repetitive process in an accounting practice, and the most exposed during an AML supervision visit from ICAEW, ACCA or HMRC. By automating document collection, identity and sanctions checks, engagement letter generation and job creation in the practice management system, a 40-person firm goes from 3 hours to about 15 minutes per client. Across 180 new clients a year, that is close to 500 hours returned to chargeable work and a complete compliance file every time.

Where the 3 hours per new client go

In a mid-sized London practice, onboarding involves an administrator, a manager and often the signing partner. Here is a typical 2026 breakdown for an owner-managed business client:

Across 180 clients, time drops from 540 to 45 hours, saving 495 hours. At a fully loaded London staff cost of about GBP 45 to 65 per hour in 2026, the saving exceeds GBP 22,000 a year, before counting freed partner time.

Obligations you cannot hand over to the machine

The Money Laundering Regulations 2017 (as amended) and the CCAB AML guidance require you to identify the client and its beneficial owners, assess risk, monitor the relationship and keep records for 5 years after it ends. Automation speeds up collection and checks, but the decision to accept a client stays human. The software must therefore:

• Block engagement letter signature until the risk assessment is approved by the nominated person.
• Timestamp every check and keep the raw response from each register queried.
• Trigger enhanced due diligence for PEPs, high-risk third countries and structures with no identifiable beneficial owner.
• Schedule periodic reviews (yearly for high-risk clients, every 3 years for others, set to your own policy).

Note that since the Economic Crime and Corporate Transparency Act, Companies House identity verification is being phased in, which your onboarding flow can capture as an additional data point. The engagement letter itself should follow your professional body's template guidance on scope, fees, responsibilities and terms.

Market tools or custom automation

The rule of thumb: if your letters and risk matrix are standard, an off-the-shelf tool is enough. If you run several service lines (tax, payroll, audit, company secretarial) with complex pricing, custom work avoids the re-keying that cancels out the saving.

Mini case study

Priya, partner at a 40-person practice in London, signs 180 new engagement letters a year. Her team spends 540 hours on them, and the last AML supervisory review flagged 12 incomplete risk assessments.

• Hours saved: 495 hours × GBP 50 = GBP 24,750 a year.
• Average time from first contact to signed letter: from 9 days to 2 days.
• Project cost: medium application at 5,500,000 FCFA (about EUR 8,385) plus Standard maintenance at EUR 114 a month, about EUR 9,750 in year one.

Payback comes in under five months, and the firm goes into its next supervisory visit with 100% complete, timestamped files.

FAQ

Will our AML supervisor accept automated checks?

Yes, provided the audit trail is complete and final approval stays human. A timestamped file with raw register responses usually scores better than a manually completed form.

Which sources are checked automatically?

Typically the Companies House API, the PSC register and the OFSI sanctions list. Adding a commercial PEP and adverse media database is a third-party subscription of roughly GBP 50 to 200 a month.

Can we keep our existing engagement letter templates?

Yes, they are converted into templates with variable fields. A practice typically uses 8 to 15, by service and entity type.

Does the client need to create an account?

No, they receive a secure link valid for 7 days to upload documents and sign. Reminders go out automatically on day 2 and day 5.

How long does the project take?

Allow 10 to 12 weeks for a medium application, including 2 weeks of testing on about twenty real files before firm-wide rollout.

Let's scope your project. We will define with you the scope (collection, AML checks, engagement letters, practice software connector) and the rollout plan for your firm. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.