Changer d’expert-comptable en cours d’année : procédure, délais et lettre type

Key Takeaways

Changing accountants during the financial year is possible, but the engagement letter controls much of the process. A careful handover protects deadlines, records, access rights, and the working relationship with both firms.

• Read the engagement letter before announcing the change.
• Respect the contractual notice period or negotiate an agreement.
• Choose timing around tax, payroll, and year-end obligations.
• Arrange the transfer of records, software access, and mandates.
• Keep written proof of notices, requests, payments, and handover steps.

1. Determine whether you can change your accountant during the year

A business does not always need to wait for its accounting year to close before changing accountants. The practical question is whether the termination complies with the contract and whether the transition can be managed without missed obligations. Start with the documents you already signed, rather than relying on a general assumption about timing.

Review the terms of the engagement letter

The engagement letter, or lettre de mission, sets out the services entrusted to the accountant and the conditions governing the relationship. Read the sections on duration, renewal, termination, notice, fees, and the division of responsibilities. Also check whether some assignments, such as annual accounts or tax filings, are described separately from recurring bookkeeping.

This review gives you a clearer picture of what has been promised, what remains outstanding, and which services the new firm will need to take over. Keep a copy of the signed letter and any amendments in your transition folder.

Check the notice period and termination conditions

Many engagement letters require advance notice, often tied to a particular date or period. The exact rule depends on the contract, so identify both the required notice and the date on which it begins to run. A termination that ignores those terms may lead to additional charges or a disagreement about the final period of service.

If the timing is inconvenient, ask the current accountant whether an earlier departure can be agreed in writing. A short written agreement is safer than an informal conversation because it records the date, the services to be completed, and the financial consequences.

Identify situations that justify an immediate change

A serious breakdown in the relationship can make a prompt change reasonable. Repeated unexplained delays, persistent errors, a lack of communication, or a major change in the company’s needs may all justify reviewing the arrangement. These concerns should be documented with dates, emails, unanswered requests, and the practical effect on the business.

An immediate change is not automatically free of contractual consequences. If there may have been professional misconduct or a failure affecting a legal deadline, obtain independent advice and preserve the relevant evidence before ending the relationship.

Understand the professional and legal framework in France

An expert-comptable operates within a regulated professional framework, while the engagement letter remains central to the client relationship. The transfer should therefore be handled with courtesy, transparency, and respect for professional obligations. The incoming accountant will normally need enough information to understand the work already performed and the matters still open.

The accountant change procedure guide can provide another general perspective, but it should not replace a review of your own engagement letter. Where the contract and the facts are unclear, ask a qualified professional or the relevant professional body for guidance.

2. Follow the correct procedure for changing accountants

Once the decision is made, the process should move in a clear sequence. Select the new firm first, notify the current accountant formally, and arrange a documented transfer. This order reduces the risk of leaving the business without support during a filing or closing period.

Compare and select the new expert-comptable

Look beyond the monthly fee when comparing firms. Ask what work is included, who will be your day-to-day contact, how questions are handled, and whether the firm has experience with your company’s legal form, payroll, tax obligations, and reporting needs. Request a written scope so that assumptions do not become disputes later.

The new accountant should also confirm whether the proposed fee covers the first year’s takeover work or whether that work is billed separately. Agree on the expected start date, responsibilities, and information required from you before signing.

Inform the current accountant in writing

Send the termination notice using a method that proves delivery, such as registered mail with acknowledgment of receipt or another reliable written channel accepted by the contract. State the date of the notice, the intended end date, and the relevant clause of the engagement letter. Keep the letter, delivery evidence, and any response together.

A calm, factual tone is usually most effective. If the change follows a dispute, describe the necessary facts without turning the notice into a long accusation; detailed complaints can be handled separately.

Allow the new accountant to contact the former one

Tell the incoming firm that the former accountant may need to provide information about the accounts, tax work, payroll, and open items. Give appropriate authorization for professional communication and respond quickly if either firm requests clarification. This helps the handover proceed between professionals instead of placing every technical question on the business owner.

You should still remain involved. Confirm that the transfer covers the full period required, identify any urgent deadlines, and ask for confirmation when important files have been received.

Confirm the transfer of the accounting files

Do not treat a promise to “send the file” as the end of the process. Ask for a written inventory of what has been transmitted, what remains pending, and who is responsible for each item. The incoming accountant should be able to identify opening balances, prior filings, working papers, and unresolved questions before taking responsibility for ongoing work.

A short handover meeting can expose missing information early. Record its conclusions by email so that both firms share the same understanding of the transfer.

3. Calculate the deadlines and plan the transition

A mid-year change creates two calendars: the contract’s notice period and the company’s accounting and compliance calendar. They may not end on the same day. Mapping both is the best way to avoid a gap in responsibility while records are moving from one firm to another.

Distinguish between the accounting year and the notice period

The accounting year determines which transactions and filings belong in a set of accounts, while the notice period determines when the professional relationship ends. One does not automatically cancel out the other. A firm may need to finish agreed work for a period even when another firm has already been selected.

Write down the notice date, contractual end date, financial year-end, and the dates of known filings. If those dates conflict, ask both accountants to agree on the division of work in writing.

Choose the best timing for the handover

The quietest period is not always available, especially for a business with payroll, seasonal activity, or a scheduled financing event. Still, avoid starting the handover immediately before a major filing unless there is a compelling reason. A few weeks of overlap can be worthwhile when the file is complex or poorly organized.

Timing decisions should reflect the company’s actual workload. The goal is not merely to change names on a mandate, but to give the new accountant enough time to understand the records before an important deadline arrives.

Coordinate tax, payroll, and annual closing deadlines

Create a single view of every obligation that could be affected by the switch. A simple table can separate the date, the responsible firm, and the evidence that the work has been completed.

Area	Deadline or milestone	Responsible party	Confirmation to retain
Tax	Next scheduled return or payment	Current or new accountant	Filing receipt and payment proof
Payroll	Next payroll run and social filing	Agreed payroll provider	Payroll report and submission record
Accounting	Cutoff for transaction processing	Current accountant	Export and reconciliation status
Annual closing	Year-end accounts and review	Firm named in writing	Closing checklist and draft accounts

This table is useful only if the names and dates are filled in for your business. Review it with both firms, then update it whenever a deadline or responsibility changes.

Create a transition calendar

A transition calendar turns a vague handover into a sequence of small decisions. Include the notice date, selection and engagement of the new firm, file export, access changes, outstanding questions, and the first review meeting. Give each task an owner and a due date rather than leaving it as a shared intention.

A practical calendar may include:

1. Confirm the contractual end date and services still due.
2. Send the termination letter and save proof of delivery.
3. Share the document checklist with the incoming firm.
4. Reconcile open deadlines before access is changed.

After these steps, schedule a final check shortly before the old mandate ends. That check is often where an overlooked filing or missing authorization is found.

4. Manage fees, outstanding work, and potential disputes

Money is a common source of tension during a change, particularly when the year is only partly complete. Separate undisputed fees from disputed amounts and separate completed work from work that was never performed. This makes discussions more precise and helps prevent the handover from becoming hostage to a general disagreement.

Check whether unpaid fees can delay the transfer

Review the engagement letter and invoices to see how unpaid fees are treated. Do not assume that an invoice is correct simply because it was issued, but do not ignore a genuine balance either. Ask for a statement showing invoices, payments, credits, and any work billed in advance.

If the former accountant raises a payment issue, request the contractual basis and the specific documents being withheld or delayed. Seek advice promptly if the issue threatens a filing deadline or the transfer of essential records.

Calculate fees for work completed before termination

The final amount should reflect the services actually completed, the agreed pricing method, and any express termination provision. Ask for a closing invoice that identifies recurring services, one-off assignments, expenses, and work still in progress. Compare it with the engagement letter and your payment history.

A written calculation is easier to review than a lump sum. It also gives the new accountant a clear picture of which assignments have been paid for and which may need to be completed or reissued.

Handle disputed invoices or unfinished assignments

Keep the transition moving while the financial disagreement is examined. Explain which line items you dispute, why, and what supporting documents you have. For unfinished work, ask both firms to state whether it will be completed by the former accountant, taken over by the new one, or stopped with an agreed adjustment.

Separate the handover from the dispute whenever possible. Paying an undisputed amount, without waiving your position on the rest, may help preserve continuity, but obtain advice before attaching legal meaning to any payment.

Know when to contact the Ordre des experts-comptables

If direct discussions fail, the relevant regional professional order may be able to explain the appropriate process or help with a professional dispute. Prepare a factual file containing the engagement letter, notices, invoices, correspondence, and a timeline of events. The order is not a substitute for legal advice where a court claim or urgent protective measure is involved.

Contacting the appropriate body early can clarify what information is needed and may encourage a more structured resolution. Continue recording every exchange while the matter is open.

5. Prepare the documents for the new accountant

A new accountant can only work efficiently with a complete and intelligible file. Begin gathering records before the termination date, especially if the old firm stores documents in a portal you may lose access to. Organize the material by accounting period and label unusual transactions with a short explanation.

Gather accounting, tax, payroll, and corporate records

Collect general ledgers, journals, trial balances, bank reconciliations, annual accounts, tax returns, payroll records, employment information, shareholder documents, registrations, and current contracts. Include correspondence about audits, payment plans, financing, and unresolved tax or social-security questions.

The aim is not to send every email ever exchanged. It is to give the new firm the records needed to understand the company’s history, current position, obligations, and open risks.

Request the accounting export and supporting files

Ask for the accounting data in a usable export format and request the supporting documents that explain the entries. Depending on the setup, this may include invoices, bank statements, fixed-asset schedules, reconciliations, tax workpapers, payroll reports, and copies of submitted declarations.

Use a checklist and ask the former firm to confirm what has been delivered. If a file is unavailable, record the reason and agree on another way to reconstruct the necessary information.

Transfer access to online services and software

List every service connected to accounting or compliance: tax portals, payroll platforms, banking access, invoicing tools, document storage, and government mandates. Decide which credentials should be transferred, which should be replaced, and which permissions should be removed after the old firm’s work ends.

Send credentials through a secure method rather than placing passwords in ordinary email. Confirm that the new firm can log in and that access is limited to the role it needs.

Protect confidential data during the handover

Accounting files contain personal, financial, and commercial information. Share them through an approved secure portal or encrypted transfer, restrict access to the people involved, and avoid sending unnecessary personal data. Keep a record of what was shared, when, with whom, and for what purpose.

Ask both firms how they retain and delete information after the handover. Good file organization should not come at the expense of confidentiality.

6. Write an effective termination letter

The termination letter should be short, precise, and consistent with the engagement letter. It is a formal notice, not a complete account of every frustration that led to the decision. Clear wording helps establish the date and gives the accountant practical instructions for the next stage.

Include the company and accountant’s identification details

Identify the company by its legal name, registered address, and registration number where appropriate. Add the accountant’s name, firm name, and address, then date the letter and identify the engagement being terminated. These details reduce the chance that the notice is attached to the wrong client file.

Use the same legal entity and contact information that appear in the signed engagement letter. If the company has changed address or legal form, mention that clearly.

State the termination date and notice period

State that the engagement is being terminated and specify the proposed effective date. Refer to the notice clause and explain how the date was calculated. If you are requesting an earlier mutually agreed end date, label it as a request and ask for written confirmation rather than presenting it as already settled.

Avoid ambiguous phrases such as “as soon as possible.” A definite date allows both firms to plan responsibilities and makes later fee calculations easier.

Request the transfer of files and confirmation of handover

Ask the current accountant to provide the accounting export, supporting records, filing confirmations, and a list of unfinished work. Give permission for the new accountant to contact the former one about the professional handover, subject to appropriate confidentiality requirements. Request confirmation of the expected transfer date and any items that cannot yet be released.

You can also ask for a final statement of fees and a point of contact for urgent questions. Keep the request proportionate; the detailed document inventory can be attached separately.

Use a formal letter template for registered delivery

A simple template should contain the parties’ details, date, subject, termination wording, effective date, transfer request, and signature. Send it in the way required by the engagement letter, preferably with evidence of delivery. Save a PDF copy, the original signed version, and the delivery receipt.

A letter can be adapted as follows:

Subject: Termination of the engagement letter — [Company name]
We hereby notify you that the engagement letter dated [date] will end on [date], in accordance with its notice provisions. Please confirm the handover arrangements, provide the accounting and supporting files, and send the final statement of fees. Our new accountant, [name], may contact you to coordinate the professional transfer.

Replace the bracketed information carefully and have the new accountant review the wording if the timing or scope is disputed.

7. Secure the transition after the change

The change is not complete when the termination letter is delivered. The company still needs confirmation that the new engagement covers the right work and that no mandate or deadline has been overlooked. Treat the first weeks as a controlled handover, with written checkpoints rather than assumptions.

Confirm the new expert-comptable’s scope of work

Read the new engagement letter line by line and compare it with the company’s actual needs. Confirm responsibility for bookkeeping, tax returns, payroll, annual accounts, management reporting, advice, and communication with authorities where those services are relevant. Note exclusions, response arrangements, and additional billing rules.

Ask who approves filings and who must provide information from the company. A clear division of responsibility is especially useful when the new firm begins before every historical file has been reviewed.

Verify that upcoming declarations are covered

Review the transition calendar again with the new accountant. Confirm the next tax, payroll, social, and corporate deadlines, along with the person responsible for preparing, approving, and submitting each item. Request evidence of submission after a filing is made.

If a deadline falls close to the changeover, obtain a written statement identifying which firm is handling it. Never infer responsibility solely from who has access to the software.

Update mandates, contacts, and digital access rights

Replace old mandates where necessary and update contact details with tax, payroll, banking, insurance, and other relevant services. Remove former staff access once the agreed handover is complete, but retain business-owned records and administrative history. Check shared mailboxes, forwarding rules, storage folders, and two-factor authentication devices as well.

Make changes in a controlled order so that the new accountant can work before the former accountant’s permissions are removed. Record each change and the date it took effect.

Keep written evidence of every step

Maintain one transition folder containing the engagement letters, termination notice, delivery evidence, fee statements, file inventory, access changes, deadline calendar, and confirmations from both firms. This record is useful for ordinary administration and invaluable if a question appears months later.

A final handover email should summarize what was received, what remains open, who owns each task, and when the next review will occur. Once both sides confirm that summary, the company can return its attention to normal operations with fewer unknowns.

Conclusion

Changing an accountant during the year is manageable when the contract, notice period, deadlines, fees, records, and access rights are handled as one coordinated process. A formal notice and a well-documented handover protect continuity, while early communication gives the new expert-comptable a realistic chance to take over without avoidable disruption.

Frequently Asked Questions

Can I change my accountant in the middle of the financial year?

Yes, it is generally possible, but you must follow the termination terms in the engagement letter and arrange responsibility for work already underway and deadlines that fall during the transition.

Do I have to wait until the annual accounts are finished?

No. Waiting may simplify the handover, but it is not automatically required. The contract, the notice period, and the practical risk of changing during a closing or filing period should guide the decision.

What happens if I do not respect the notice period?

The accountant may claim fees or an agreed termination payment, depending on the engagement letter and the circumstances. Review the contract and seek advice before assuming that an early departure has no cost.

Who contacts the former accountant about the handover?

The new accountant will often contact the former one after receiving authorization, but the client should remain involved and monitor the transfer of records, deadlines, and unresolved assignments.

Which documents should I request?

Request accounting exports, ledgers, reconciliations, annual accounts, tax filings, payroll records, corporate documents, supporting invoices, access information, and a list of outstanding work relevant to the business.

Can the former accountant keep my files because I dispute an invoice?

The answer can depend on the contract, the type of document, applicable professional rules, and the facts of the dispute. Separate undisputed payments from contested amounts and obtain professional advice if the handover is being delayed.

How should I send the termination letter?

Use the method required by the engagement letter and choose a delivery method that creates reliable proof, such as registered mail with acknowledgment of receipt. Keep the signed letter and delivery evidence in your transition folder.