Client onboarding in accounting firms: the 6-step method

You've signed a new contract: the hardest part is over, you think. In reality, the relationship is just beginning, and it's in the weeks following the signing that it's won or lost. A client who waits three weeks for an update, who receives four emails from four different people requesting the same documents, or who doesn't know when their first deliverable will arrive, is already starting to have doubts. And a client who doubts from the outset is a client who will shop around again at the first sign of trouble.

Onboarding is the process that transforms a signed agreement into a working relationship: defining the mandate in writing, meeting in person, collecting documents, granting access, delivering initial value quickly, and then ensuring everything runs smoothly. This guide details a 6-step method adapted to French practices, from solo practitioners to firms with twenty employees, including a template timeline, a list of documents to request, and key performance indicators to track. The stakes are directly financial: each client retained for another year represents a median value of approximately €2,000 in recurring annual fees ( Bankeo Barometer 2024-2026 , data drawn from over 15,000 requests received since 2023).

Why do the first 90 days determine the entire relationship?

The period following the signing is when the client is both most attentive and most vulnerable. They have just made a choice, sometimes after comparing several firms, and they are unconsciously seeking confirmation that they made the right decision. Three mechanisms work in your favor if you leverage them, and against you if you ignore them:

• The first impression is crucial. The perceived quality of your firm is established in the initial interactions. A structured welcome, with a clear schedule and a designated contact person, creates an image of professionalism that will reflect positively throughout the entire engagement. An impromptu onboarding creates the opposite impression, even if your technical work is excellent.
• The quality of the data downstream. A sloppy onboarding process means missing documents, an incorrectly implemented chart of accounts, and inaccurate opening balances. You'll pay for these shortcuts for years to come, in unbillable hours of corrections and shared frustrations.
• Retention. The cost of acquiring a client is only recouped over time: a recurring mandate retained for three years is worth several times its initial invoice. And the decision to stay or leave is made early on. Longer-term loyalty strategies are detailed in the section on client retention in accounting firms , but it all starts here.

There's also a capacity issue: a repeatable onboarding process reduces the time each new client spends, increasing the number of engagements your team can handle without hiring. It's the same reasoning as for time wasted finding clients : unstructured hours are the firm's most expensive.

The 6-step method, from signing to day 90

Here is the complete sequence. It unfolds over approximately two weeks for steps 1 to 5, then over three months for the follow-up.

1. Step 1: The letter of assignment must be signed before any work begins. CPA Canada Provincial professional orders recommend documenting the scope of the engagement, each party's responsibilities, fees, and termination procedures in writing. Beyond compliance, the engagement letter is your best onboarding tool: it forces a conversation about what is included and what is not, before the first misunderstanding arises, rather than after. No document is considered complete until it is signed.
2. Step 2: The kickoff meeting, within 5 business days. Thirty to sixty minutes, in person or via video conference, with an agenda sent in advance: introduction of the assigned contact person, deliverable schedule, communication channels (who to contact, for what purpose, and with what response time), and an overview of the client's business. This is also the time to note any specific details: seasonality, growth projects, and any issues experienced with the previous firm. This meeting builds upon the work begun during the initial call with the prospect : what you promised to close the deal, you now organize.
3. Step 3: Document collection, using appropriate tools and in a single wave. The worst customer experience is receiving requests piecemeal. Send a complete and personalized list the day after the meeting, using a secure portal for submission (never send tax documents via standard email). The standard list is detailed in the following section.
4. Step 4: Access and data retrieval. Accounting access to bookkeeping software, authorizations to represent the company with the tax authorities; Canada and, if applicable, access to Revenu Québec's bank statements for read-only purposes if the mandate allows. Then comes the technical resumption: validation of opening balances, review of the chart of accounts, and reconciliations that are overdue. Document your findings: the initial state of the file, recorded in writing, protects you and the client.
5. Step 5: A first deliverable quickly, even if modest. Don't wait until the end of the fiscal year to generate value. An updated reconciliation, a simple dashboard, a list of findings on the taken-over case: a deliverable within the first 30 days makes the promise tangible and gives the client a concrete reason to be satisfied with their choice.
6. Step 6: Checkpoints at 30, 60, and 90 days. Three short, scheduled checkpoints: on day 30, confirm that the system is working (documents, access, communication); on day 60, review the initial deliverables and make adjustments; on day 90, conduct a brief satisfaction survey. It is on day 90, when the relationship is established and the value demonstrated, that requesting a Google review or recommendation is most natural.

“The contract isn’t won at the signing; it’s won in the 90 days that follow. An entrepreneur who receives a clear onboarding process, with a timeline and a dedicated contact person, doesn’t go looking elsewhere. Those left waiting without any updates do. Onboarding is retention that starts on day one.” – Arnaud Bertrand, CEO of Bankeo

Improvised or structured onboarding: what difference does it actually make?

The difference between the two approaches is not apparent on the first day. It becomes apparent in the non-billable hours, the quality of the file, and the duration of the relationship.

The transition from one to the other doesn't require expensive software: a sample engagement letter, a standard calendar, a document list categorized by client type, and a tracking calendar are all you need to get started. The tools then amplify what works, as detailed in the firm's technology and productivity guide .

The list of documents: claim everything, just once

Adapt this base to the mandate (bookkeeping, year-end, taxation, payroll) and the type of entity, then create templates for each client profile:

• Identity and structure: articles of incorporation or registration, shareholders' agreement if applicable, company and tax numbers (VAT, VAT), register of recent resolutions.
• Accounting history: financial statements for the last two fiscal years, latest tax returns filed, closing trial balance, access to existing accounting software or full export.
• Banking and financing: bank and credit card statements for the last twelve months, loan agreements and lines of credit, significant lease agreements.
• Taxation and rebates: recent tax assessment notices, statement of provisional payments, history of tax rebates and withholdings, all ongoing correspondence with the tax authorities.
• Payroll and personnel: list of employees, recent payroll statements, standard contracts if applicable.
• Authorizations: forms for representation with tax authorities, consents for access to banking and software platforms.

Two golden rules: a single, secure channel for all document submissions, and a planned rather than reactive follow-up. If a client is slow to provide their documents, it's a signal to address early: behaviors that complicate the relationship are more easily corrected on day 15 than in month 8, as explained in the guide on managing difficult clients .

Measure your onboarding to improve it

A process we don't measure deteriorates silently. Four indicators are enough, tracked in a simple table:

• Timeframe from signature to start-up meeting: aim for 5 working days or less.
• Complete document collection time: the time between sending the list and receiving the last document. This is often the bottleneck; it is reduced with clearer lists and a simpler portal.
• Time to first deliverable: aim for less than 30 days, even for a modest deliverable.
• Internal hours per integration: the total time spent per case. This indicator shows how many new clients your team can take on per month, a key piece of data for managing your firm's capacity .

Onboarding is also easier when clients arrive already qualified. A vague, poorly defined request from the outset results in a chaotic onboarding process; a request where the need, sector, and deadline are verified in advance leads to a seamless integration. This is the principle behind Bankeo Pro : the entrepreneur describes their situation, the request is verified, and then matched with firms whose profiles match, often within 48 hours. You begin the relationship with the context fully understood, and the cost of the service is a fixed amount known in advance per completed deal, never a percentage of your fees. Canada Hundreds of deals have been closed by firms within the network. The quality criteria that guide the network's verification are documented in the Bankeo Index .

Frequently asked questions

How long should the onboarding of a new accounting client take? The active stages (engagement letter, meeting, data collection, access) take two to three weeks in a structured process. Follow-up continues until day 90, with checkpoints at 30, 60, and 90 days.

Is a letter of engagement mandatory in Canada ? Documenting the engagement in writing is the practice recommended by CPA. Canada and by state orders, and certain missions require it according to applicable standards. Check the requirements of your professional order; in any case, working without a written framework exposes you unnecessarily.

What documents should you request first from a new client? Financial statements and declarations for the last two fiscal years, the closing trial balance, twelve months of bank statements, recent tax assessments, and access to their existing accounting software. Send the complete list at once via a secure portal.

How do you manage a client who doesn't provide their documents? Schedule follow-ups in advance (day 3, day 7, day 14) rather than sending them out of the blue, offer a 15-minute call to resolve the issue, and document the delays. If the behavior persists, address the issue early: the engagement letter, which clearly outlines the client's responsibilities, is your guide.

Do you need specialized software to structure your onboarding process? Not initially: a sample engagement letter, a document checklist for each client profile, a standard agenda, and a follow-up calendar are sufficient. A secure client portal is the first worthwhile investment; automation comes later, once the process is established.

How does Bankeo facilitate the onboarding of new clients? Requests submitted to firms within the network are pre-verified: needs described, sector, type of entity, and deadline. You begin the onboarding process with the necessary context rather than starting from scratch, and the service cost is a fixed amount known in advance per completed case, never a percentage of your fees.

Sources

• CPA Canada , resources in office management , on the written recording of missions, accessed in July 2026.
• Bankeo, Accounting Fees Barometer 2024-2026 , internal data taken from more than 15,000 requests received since 2023: median of approximately $2,000 per year, range of $500 to $6,000 depending on the sector.
• Bankeo, Bankeo Index , grid of 67 network verification criteria, accessed in July 2026.

Par Brian Bergeron, fondateur de Bankeo. Bankeo Pro met en relation plus de 1 500 firmes inscrites avec des demandes pré-qualifiées d'entrepreneurs partout au Canada : des clients qualifiés, avec le contexte en main dès le premier jour (4,7/5 sur 180+ avis Google). Découvrir Bankeo Pro pour votre cabinet.