Client onboarding for accounting firms: the engagement letter checklist

Client onboarding for accounting firms: the engagement letter checklist


 

The engagement letter is the foundation

Every difficult client relationship in an accounting firm traces back to onboarding. The scope was never written down, the fee was a verbal estimate, nobody agreed who chases HMRC, and two years later the argument is about what was promised in a phone call nobody recorded. The engagement letter fixes all of this in a few pages. Professional bodies expect written terms of engagement, and beyond compliance, the letter is the firm's best commercial protection. Getting it right at onboarding is far cheaper than renegotiating mid-relationship.

Why firms still get it wrong

The common failures are not dramatic. A firm reuses a five-year-old template that no longer matches the services actually delivered. The letter covers the accounts but not the ad hoc advice the partner keeps giving away free. Fee terms say "as agreed" instead of stating the basis. Nobody updates the letter when the client adds a payroll scheme or starts trading through a second company. Each gap becomes a dispute later, and the firm discovers the weakness of its paperwork at the worst possible moment.

The essential contents checklist

A proper engagement letter for a business client should cover, at minimum:

  • The parties and the exact scope of services: accounts, tax returns, payroll, bookkeeping, advisory, each named or clearly excluded.
  • The client's responsibilities: providing complete records on time, approving documents, meeting HMRC deadlines, and the consequences of late information.
  • The firm's responsibilities and service standards: what will be delivered, by when, and to what professional standard.
  • Fees and billing: the basis of charging, whether fixed or time-based, payment terms, and what triggers additional fees.
  • Anti-money laundering: the firm's obligations to verify identity and report suspicions, noted plainly so the client is not surprised later.
  • Data protection: how client data is held, processed and shared, including any use of cloud systems or overseas support.
  • Money laundering reporting: the duty to report suspicions to the authorities without informing the client, stated as a legal fact.
  • Limitation of liability: a cap proportionate to the fee and the risk, drafted with proper legal input.
  • Duration and termination: the term, notice periods, and handover arrangements on exit.
  • Complaints: the firm's procedure and the client's right to escalate to the professional body.
  • Professional standards: the ethical framework the firm works under, such as the PCRT for tax work.

AML and KYC at onboarding

Onboarding is also the moment for client due diligence, and it cannot be an afterthought. Verify the identity of the client and, for companies, the beneficial owners. Screen against sanctions and politically exposed persons lists. Document a risk assessment for the client: sector, structure, source of funds and any red flags. Set the ongoing monitoring rhythm at the same time, because due diligence is not a one-off event. Keep the evidence filed and retrievable; if the firm's supervisor or a professional body asks, "we checked at the start" needs a paper trail behind it.

Setting the commercial terms

The engagement letter is a commercial document as well as a legal one. Fixed fees give clients certainty and reward the firm's efficiency, while time-based billing suits unpredictable advisory work; many firms now blend the two. State payment terms explicitly, 14 or 30 days, and what happens on non-payment, including the right to pause work. Include a scope-creep clause: additional services requested during the year are quoted separately rather than absorbed silently. Build in an annual fee review so pricing keeps pace with the work actually being done, and confirm any fee changes in writing before the new year starts.

The review rhythm

An engagement letter is not a fire-and-forget document. Reissue it whenever the scope changes materially: a new trade, a new entity, payroll added, audit threshold crossed. Even without changes, reconfirm the terms annually alongside the fee review; a short re-engagement letter keeps everything current and reminds the client what is included. Store executed letters centrally, not in individual managers' inboxes, so the firm can prove its terms when it matters.

Strong onboarding protects the firm's revenue, its compliance record and its client relationships all at once. For firms whose teams are stretched thin, the back-office side of onboarding, from document collation to recurring compliance work, is ideal work to delegate. Finex Outsourcing is a Global Business Services provider that supports UK accounting firms with dependable outsourced capacity, so partners spend onboarding time on the relationship, not the paperwork. Find out more at Finex Outsourcing.


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