How to switch accountants without friction in 2026

Changing your accounting firm is a routine management decision. What makes it complicated is rarely the decision itself — it is the absence of method at the moment of execution. A missed notice period, an incomplete file or forgotten access credentials can delay the handover by several weeks and generate unexpected costs.

This guide covers the four topics that determine whether a switch goes smoothly or badly: terminating the engagement, choosing the right timing, understanding the deontological framework between firms, and recovering every document you are entitled to.

In summary: you can switch accountants at any point in the year, but the cleanest transition happens just after the year-end close and the filing of annual accounts. Start by reviewing your engagement letter (notice period, automatic renewal), inform the new firm before you give notice, and draw up a complete list of documents to recover. French professional rules require your outgoing firm to return your original documents, even in the event of a fee dispute.

The process follows a six-step sequence. Order matters: choose your successor before you give formal notice.

1. Select the new firm and agree on the exact scope — bookkeeping, VAT, payroll, annual legal filings, management reporting.
2. Review the engagement letter in force: commitment period, notice clause (three months is common), automatic-renewal terms, document-return conditions and any outstanding fees.
3. Send formal notice by registered letter with acknowledgement of receipt, respecting the agreed notice period. State the intended end-of-mission date explicitly.
4. The new firm sends a courtesy letter. Under the code of professional conduct for French chartered accountants (Code de déontologie des professionnels de l'expertise comptable, Légifrance), your incoming firm must write to its predecessor to confirm that the situation is regular — fees settled, no ongoing dispute — before formally accepting the engagement.
5. Draft and send the document recovery list (see table below). Agree on a handover deadline and confirm it in writing.
6. Hold a takeover checkpoint with the new firm to validate opening balances, accruals and the next set of deadlines.

The full process typically takes two to four weeks. Time invested upfront prevents hours of historical reconstruction later.

Yes, a change is possible at any point in the financial year. But timing directly affects how smooth the handover will be.

Our reading: the optimal window is the few weeks following the annual tax return filing and, where relevant, the DAS2 (third-party payment declaration) — typically May or June for a 31 December year-end. At this point the file is complete, opening balances are known, and the exports are most usable for an incoming firm.

A mid-year switch is entirely manageable, provided you agree a precise cut-off date and insist on a complete export at that date — not an approximate handover.

Yes, unambiguously. Your original accounting documents — invoices, bank statements, contracts, source records — belong to you. The firm is legally required to return them.

The right of retention (droit de rétention) is more nuanced. An expert-comptable can, under certain conditions, retain the work products produced by the firm — internal reports, formatted financial statements — if fees remain unpaid. This right does not extend to original documents belonging to the client.

Two categories must be kept distinct:

• Documents belonging to the client (invoices, bank records, contracts, source documents): unconditional return, no exceptions.
• Work produced by the firm (formal accounting productions, internal reports): the firm may invoke a right of retention if fees are outstanding — subject to the specific circumstances and contractual terms.

In practice, the vast majority of transitions happen without dispute. If your firm invokes a right of retention improperly or withholds your original documents, you can refer the matter to the Conseil régional de l'Ordre des experts-comptables.

Request the following list in writing, with a stated return deadline.

A frequent issue in our takeovers: the FEC is the most underestimated document. It is the only file that allows the incoming firm to pick up the history without re-entering data. Some outgoing firms deliver a PDF general ledger instead. Specifically request the FEC in DGFiP standard format — it is a regulated format and every firm can produce it.

Before accepting your mandate, your new firm is required by the French professional code of conduct to write to the outgoing firm. This letter serves to verify that the situation is regular: fees are settled, no dispute is active, and the engagement can be taken on without conflict of interest.

This is a deontological obligation, not a veto right. The outgoing firm cannot block the change. The letter is an information mechanism, not an approval process. If the situation is clean — which it is in the great majority of cases — the transition proceeds without additional friction.

Practical advice: settle any outstanding fees before announcing the change. It is the simplest way to accelerate the transition and prevent the courtesy letter from generating a prolonged exchange between firms.

From 1 September 2026, all French VAT-registered businesses must be able to receive electronic invoices through an accredited partner platform (PDP — plateforme de dématérialisation partenaire) or the public invoicing portal. Emission obligations will apply progressively based on company size.

If your current firm has not yet structured its offering around PDP compliance, this is a legitimate reason to evaluate a switch. A firm that is already tooled and trained on this reform will save you the cost of improvised compliance.

Our digital finance transformation service covers this support.

For professionals and consultants, our article on accounting for liberal professions and our overview of freelance accounting support address the specifics of switching firms with a BNC or micro-enterprise structure.

The engagement letter (lettre de mission) is a service contract. It may set a specific notice period — three months is common in firm practice, but there is no single statutory rule. What governs you is what your own letter says.

A few points to check before giving notice:

• Initial commitment term. Some letters set a minimum term of one year. Confirm whether you are still within it.
• Automatic renewal. If the letter renews by tacit agreement, termination usually has to reach the firm before the anniversary date, within a set window. Miss it and the mandate may roll over for another full period.
• Effective termination date. Termination takes effect on receipt of your registered letter. The actual end-of-mission date may fall later if the notice period runs from that receipt.

If the engagement letter is missing or silent on this point, you can still terminate, but the firm may invoke a reasonable notice period. Professional dialogue is the quickest route in that case.

In practice, return deadlines are rarely set out precisely in the contract. If your firm does not respond promptly to your request:

1. Confirm your request in writing (email or letter), listing precisely the documents expected and setting a reasonable deadline.
2. Restate the end-of-mission date and the fact that the documents belong to you.
3. If the deadline passes, send a formal reminder noting your right to refer the matter to the Ordre.
4. As a last resort, refer the matter to the relevant regional Conseil de l'Ordre des experts-comptables.

Open conflict is rare. Most situations resolve with a clear, documented request. What blocks the process in practice is usually a vague request — a vague list produces a vague response.

For liberal professions and independent consultants, the stakes of a firm change are often different. The engagement is narrower (BNC, Form 2035 or 2042-C-PRO, micro regime), but the relationship is frequently more direct. Access to the professional tax space (impots.gouv.fr) and to URSSAF is often overlooked during the handover — make sure you recover full access to your own space, not just PDF copies of the filed returns.

A well-prepared firm change delivers more than a fee adjustment. It restores clarity on the numbers, faster responses, and coherence between your accounts and your management decisions.

Updated 2026-05-26. This article is for information purposes and does not replace personalised advice. For your specific situation, consult a chartered accountant registered with the Ordre des experts-comptables.