Switching accountants: the timeline and notice period to respect

Quick answer. There is no statutory notice period to switch accountants in France: the notice is contractual, set by your engagement letter, often 3 months for an annually renewable mission. Terminate by registered letter with acknowledgment, and aim for the window after the tax return is filed but before the next year-end closing, so you do not pay two firms for the same financial year.

Changing firms is not only about the relationship or the price. It is first a matter of timing. Poorly scheduled, a switch makes you pay two sets of fees for the same financial year, or worse, leaves you without a contact days before a VAT deadline. Well scheduled, the handover is invisible to your business. This timing question is exactly what we detail here, alongside the complete procedure to change accountants we have documented separately.

First misconception to correct: no text sets a statutory notice period between a client and their accountant. The applicable timeframe is strictly contractual. It appears in the termination clause of your engagement letter, a mandatory document under the profession's Code of conduct (decree n 2012-432 of 30 March 2012).

In the files we take over, the clause most often provides for a 3-month notice, with an annual mission renewed by tacit renewal. Some letters require termination to be served a set number of months before the mission's anniversary date, failing which it rolls over for a full year. This is the first trap to check, which is why we always recommend you review the engagement letter before signing.

The profession is a regulated one, registered with the French Order of Chartered Accountants and governed by ordinance n 45-2138 of 19 September 1945. As a firm registered with the Order in the Paris region, we apply the same ethical framework both when leaving and when taking over, which smooths the transition between peers.

Our reading#

The real issue is not the length of the notice, but its trigger date. A 3-month notice sent at the wrong time locks you in for another year. First take out your engagement letter, calculate the deadline to serve notice, and only then organize the search for a new firm.

It all depends on what your contract provides. The engagement letter may contain an early-termination indemnity clause, for example when you terminate before the end of a multi-year commitment or without respecting the notice. Such indemnity, where it exists, is contractual in nature: it stems from the signed agreement, not from a general legal obligation.

A key distinction: fees already due for work performed remain payable. You settle the work done up to the end-of-mission date. However, a firm cannot turn a fee dispute into a freeze on your documents, as we explain below.

The optimal moment is after the tax return for the closed financial year is filed and, ideally, before the next year-end closing opens. This avoids double billing and lets the new firm start from finalized accounts, which reduces the risk of carry-forward errors.

Here is the reverse timeline we recommend, step by step:

1. Reread the termination clause and notice period in your engagement letter, and note the deadline to serve notice.
2. Choose the optimal moment, ideally after the tax return is filed and before the next closing.
3. Serve termination by registered letter with acknowledgment, respecting the contractual notice.
4. Have the new firm send the takeover letter to the former one, under the duty of professional courtesy.
5. Organize the transfer of accounting files, the FEC audit file and tool credentials.
6. Confirm the switch is effective before the first VAT, payroll or tax-return deadline.

To synchronize these steps with your reporting obligations, lean on the 2026 tax calendar for the self-employed: it dictates the deadline-free window where the handover can happen calmly.

Trade-off: switch now or wait for year-end?#

Two legitimate options coexist. Switching mid-year is possible but often requires two firms to operate over the same period, hence coordinating the takeover of the current year's entries. Waiting until year-end and the filing of the return simplifies the takeover but means waiting. We favor the second option for entities with complex accounting, and the first when the relationship has become unworkable or the firm no longer hands anything over.

The total time combines two clocks: the contractual notice on one side, the technical transfer time on the other. The notice sets the longer boundary; the transfer itself, when well prepared, takes from a few days to a few weeks.

Digitalization strongly speeds up the transfer. When the file is kept on a pre-capture tool such as recovering data from Pennylane, data takeover is much faster than with paper binders. It is also an argument to streamline bookkeeping and accounting review in Paris at the new firm.

Unpaid fees. The duty of professional courtesy requires the new firm to check, through the takeover letter, that there are no unpaid fees before finalizing the handover. Settle the amounts genuinely due to avoid any blocking point.

The former firm retains your documents. A chartered accountant registered with the Order may only retain its own work product (balance sheet, annual accounts, returns it prepared), under a strictly framed right of retention. It must always return the documents you provided (invoices, bank statements, contracts, supporting documents) held on deposit, under art. 1921 of the Civil Code. The general basis of the right of retention is art. 2286 of the Civil Code, and its exercise requires a claim that is certain, liquidated and due, correlated to the retained documents. Retaining the client's documents despite an unpaid invoice is a breach. If you face this blockage, see our advice to recover a balance sheet the former accountant refuses to hand over.

Insolvency proceedings. If your company is under safeguard, reorganization or liquidation, the retention right conferred by point 4 of art. 2286 of the Civil Code is unenforceable against the requests of the court-appointed administrator or receiver during the observation period and the execution of the plan (art. L.622-7 of the Commercial Code). Documents must be transmitted and cannot be made conditional on payment.

Very small structure. For a limited company or a small entity, the cost of a double financial year weighs more heavily. Align the switch with year-end and anticipate the budget for an accountant for a SARL at the new firm before serving notice.

The e-invoicing reform changes the switch calendar. Receiving electronic invoices becomes mandatory for all companies on 1 September 2026. Issuing them applies to large companies and mid-caps on the same date, then to SMEs and microenterprises on 1 September 2027 (impots.gouv.fr). In practice, avoid switching firms right when you connect to a dematerialization platform: pick a slot where neither the former nor the new firm is mid-configuration.

Second point: never serve notice before you have identified a new firm and obtained an agreement in principle. A notice launched into the void exposes you to a period without any contact, right before a deadline.

What the tax authority looks at#

The tax authority is not interested in the identity of your firm, but in the regularity of your filings. A poorly prepared switch that causes a late VAT or tax-return filing exposes you to late penalties, entirely independent of the change of provider. Filing continuity is therefore the absolute priority of the reverse timeline.

Recently, a director of a services SME asked us to take over their file mid-year, frustrated by slow response times. Reading their engagement letter, we found that an immediate notice would have committed them to an additional year, because the denunciation deadline had been missed. We advised waiting six weeks, just past the anniversary date, then serving notice. The result: no extra year of notice imposed, and a takeover scheduled after the return was filed, with no double billing.

This file sums up our conviction. Switching accountants is won or lost in reading the engagement letter and choosing the notice date, well before the price question. The takeover letter between peers, provided for by the Code of conduct, then handles most of the technical coordination. The client has almost nothing to do, provided both clocks, contractual and fiscal, have been aligned.

Hayot Expertise tip. Before any notice, let us review your termination clause and your deadline calendar. Together we determine the notice date that does not trigger a renewal, then we manage the takeover letter and the FEC transfer. A well-timed switch is invisible to your business. That is our goal on every takeover at our chartered accounting firm in Paris 8e.