Client Offboarding: A Clean Process for Accounting Firms
- Published
- Reading time
- 8 min
- Written by
- SpidNums
A clean client offboarding covers five steps: a dated disengagement decision, a written disengagement letter listing completed work and the deadlines the client now owns, cancelled CRA authorizations, records returned with retention documented, and internal cleanup that ends recurring services so the departed client stops generating reminders.
Why offboarding needs a checklist too
Firms design onboarding and improvise offboarding, which is how departed clients leave live CRA authorizations, recurring reminders that fire into a void, and files nobody formally handed over. Every loose end is either a liability or a distraction, and both compound quietly.
The risk is asymmetric: a sloppy exit from a small engagement can generate more professional exposure than the engagement ever generated in fees.
Make it a decision with a date, not a drift
Offboarding starts with a dated decision: this engagement ends, effective then. Relationships that drift — unreturned calls, unpaid invoices, work quietly not renewed — leave the firm's obligations ambiguous, and ambiguity about who is responsible for a filing is the most dangerous state a client file can be in.
An annual grading of the book is where the decision usually gets made deliberately: which engagements no longer fit the firm's services, pricing or capacity, and which of those deserve a planned, graceful exit this year.
The disengagement letter
The disengagement letter is the exit's engagement letter: it states the effective end date, the work completed and the work expressly not being completed, every known upcoming deadline the client is now responsible for, and the arrangements for records handover. Written, dated, and acknowledged.
The deadline list matters most. Flagging imminent filings in writing — the next GST/HST period, an approaching year-end, instalments — is both basic professional courtesy and the firm's clearest protection against 'we assumed you were still handling it'.
Cancel or transfer CRA authorizations
Cancel the firm's representative authorization for every program account — income tax, GST/HST, payroll — once the engagement ends, and tell the client to remove the firm from their side as well. An authorization left active keeps the firm visibly connected to filings it no longer controls.
Track this per account, not per client: a firm authorized on corporate tax, GST/HST and payroll has three cancellations to confirm, and the forgotten one is usually payroll.
Records handover and what to retain
Return what the client provided, hand over final versions of deliverables, and keep the firm's own working papers under its retention policy. Document what was returned, to whom, and when — the handover record is the thing you will want two years later, not the handover itself.
Remember that clients carry their own CRA record-keeping obligations — generally six years — so the letter should remind them to retain what you return. For the firm's own data, an export beats archaeology: SpidNums exports client records to CSV or XLSX, which makes the file you archive on exit complete and self-contained.
Internal cleanup: stop the machine for this client
The client's recurring services must actually end in the firm's systems, or the practice keeps planning work nobody will do: reminders firing on the old GST/HST cadence, a year-end alert next spring, workload reports counting a client nobody serves.
In SpidNums that means ending the client's service assignments so their next-due dates stop driving Reminders, closing or cancelling open projects in Task Master, updating the client's status in the Client CRM, and letting the assigned accountant's live workload reflect the freed capacity.
Leave the door open
Most departures are about fit, price or geography, not grievance — and former clients refer people for years if the exit was generous. A clean handover to the successor accountant, delivered promptly and completely, is the cheapest marketing the firm will do that year.
The test of a good offboarding is that the successor firm never needs to call you twice.
Frequently asked questions
What should a disengagement letter include?
Four things: the effective end date of the engagement, the work completed and the work expressly not being completed, every known upcoming deadline the client is now responsible for — filings, remittances, instalments — and the arrangements for returning records. It should be written, dated, and acknowledged by the client, because its purpose is eliminating ambiguity about who owns what.
Should a firm cancel CRA authorization when a client leaves?
Yes, for every program account the firm was authorized on — income tax, GST/HST, payroll — and the client should remove the firm from their side as well. An authorization left active keeps the firm connected to accounts and filings it no longer controls. Track cancellations per account rather than per client, since firms are typically authorized on several.
How long should records be kept after a client leaves?
Clients must generally keep their own records for six years from the end of the last tax year they relate to, so remind departing clients of that when returning their materials. The firm keeps its own working papers under its retention policy and professional-body requirements. Confirm current CRA retention guidance on canada.ca before relying on a specific period.
When should a firm offboard a client?
When the engagement no longer fits the firm's services, pricing or capacity — decided deliberately, usually at an annual review of the book, rather than by drift. Time the exit away from the client's imminent deadlines where possible, and never leave a filing period ambiguous: until the disengagement letter states an end date, the work is still yours.
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