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The New Accounting Client Onboarding Checklist For 2026
The most expensive client problems are visible before you take the work on. This guide turns new client onboarding into a checklist that protects your margins, your compliance, and your team.

A warm referral, a routine-looking business, a partner too busy to run the usual checks. Three months later the firm has inherited two years of unreconciled accounts, a second entity nobody mentioned, and forty hours it will never bill.

Every one of those problems sat in plain view before the engagement started. What was missing was a step that forced someone to look. This guide is that step.

What’s Inside?

  • A client acceptance screen that tells you whether to say yes, before you commit your name, your liability, and your team’s time
  • Where AML and client due diligence obligations now sit across the US, UK, Canada, and Australia, including the AUSTRAC changes arriving in 2026
  • How to write an engagement letter that stops scope creep and protects you in a dispute
  • A records and access handover checklist, so you don’t discover a mess the night before a filing deadline
  • A first-90-days plan that sets client expectations you can actually keep
  • How to turn the whole process into a repeatable system your team runs the same way every time

Who is it for?

  • Accounting and tax firm owners
  • Partners
  • Practice managers
  • Any firm who takes on new clients and want fewer surprises after they say yes.

What makes it different?

Most onboarding content stops at workflow setup. This guide starts a step earlier, at the decision to accept a client, and works through the acceptance, compliance, scope, and liability questions that apply to every engagement you take on, whether that’s accounts, tax, or advisory.

If onboarding keeps costing you write-offs and compliance headaches, this is the checklist that moves the risk to the front, where it’s cheap to handle.

Download the guide and get the full checklist today!

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