Are you changing fiduciary services while your business or personal situation involves several countries? Prepare a transition that preserves documents, analyses and deadlines. The new firm must understand what it is taking over, and you must know who completes each file.
The transfer of your accounting does not change your tax residence or the actual place where the activity is carried out. These matters must be analysed separately.
The framework to check
Tax residence, salary taxation and social security affiliation are governed by separate rules. The relevant bilateral conventions and European rules must be examined separately. A threshold or solution applicable to a neighbouring country must not be transposed to another.
Mapping obligations in each country
Describe where the company is established, where decisions are made and where work is performed. Identify the employees, directors, clients and establishments concerned. Distinguish the company’s obligations from those of individuals.
Ask the new firm which countries are effectively covered by its engagement and which situations require a foreign correspondent. Luxembourg expertise does not automatically mean expertise in a French, Belgian or German tax return. Tax conventions must be examined based on specific facts.
Setting the handover date and responsibilities
Review the termination conditions and agree in writing on the period being taken over. Who prepares the accounts for the current financial year? Who responds to an audit for a prior period? Who files the next returns? These answers must be known before access is withdrawn.
Draw up a transition timetable that mentions upcoming filings and payments. A takeover during the closing period may require more preparation. Request a separate budget for the takeover, the review of balances and any corrections to historical records.
Preparing a complete transfer file
Gather trial balances, general ledgers, supporting documents, annual accounts, returns, filing acknowledgements, contracts and fixed-asset schedules. Add the list of pending transactions, letters from the authorities and assumptions already adopted.
Check that the files can be used, rather than merely printed. Document banking and administrative authorisations without providing personal passwords. Arrange the new mandates, then remove the former access rights once the transfer has been confirmed.
Checking the first period taken over
Request a reconciliation between the transferred balances and the balances taken over. Check a few representative transactions: foreign invoice, director’s remuneration or payment in a foreign currency. The aim is to identify configuration differences quickly.
A change of provider may improve monitoring, but does not guarantee tax savings. Have transition costs, recurring fees and options requiring prior legal or tax analysis priced separately.
Preparing a handover list that both firms can understand
Classify the file by period and subject: accounting, tax, social security and legal matters. For each set, indicate the format, the last date processed and any outstanding points. A trial balance without a date or a folder of documents without matching references does not make it easy to check what is missing.
Add a log of important decisions: treatment of a foreign transaction, method adopted for an estimate, correspondence with an authority or holding commitment. Attach the available analyses and identify those that require updating. The new firm may need to review a position; it must be able to understand the one that was applied.
The closing file provides a basis for financial documents. MyGuichet access and mandates must be reviewed separately from the transferred files. The objective is to give the new adviser the necessary authorisations without sharing users’ personal credentials.
Validating the takeover based on concrete results
Set a number of receipt checks: opening balances reconciled, fixed assets taken over, prior returns accessible and deadlines assigned. Request the list of anomalies and additional work before considering the transfer complete. The takeover quotation must explain what is simply an import and what requires correction.
For cross-border situations, provide work locations and analyses by country. The teleworking guide recalls the distinction between taxation and social security. Changing firms does not reset periods already elapsed or the facts of the year. Supporting documents and commitments must follow the file.
Finally, arrange for the return and revocation of access rights that are no longer needed, with written confirmation. The data exchanges guide helps prepare this stage. Keep a contact person for questions about historical records and clearly allocate responsibility for responses to the authorities. A successful transition is measured by continuity of processing and understanding of balances, not merely by the first file received by the new firm.
| Batch | Check | Point to formalise |
|---|---|---|
| Accounting | Consistent balances and details | Discrepancies and corrective work |
| Tax | Returns and correspondence available | Next deadline and responsible party |
| Social security | History and parameters taken over | Continuity of the next payroll |
| Access | Appropriate mandates and verified return | Date of withdrawal of former authorisations |
Let us look at a practical case
Fictitious educational example, intended to explain the reasoning.
A Luxembourg company managed by a person residing abroad changes firms before a VAT deadline. It obtains confirmation of who completes the period, then transfers the trial balance, supporting documents, prior returns and cross-border issues already examined. The new firm tests the files and reconciles the balances before the first return. Mandates are adjusted after confirmation of the takeover; the director’s personal obligations are subject to a separate scope.
Points to prepare
- Countries and persons concerned identified.
- Engagement letter and takeover date specified.
- Deadlines allocated between the two firms.
- Balances, exports and access rights checked.
Frequently asked questions
Do you need to change your structure to change firms?
No, the choice of provider is separate from the legal form. A change of structure requires its own analysis.
Can only PDFs be transferred?
PDFs can be useful, but do not always replace the accounting data and supporting documents required for a reliable takeover.
Useful terms in this guide
Questions to ask the professional
- What consequences should be distinguished between tax and social security?
- What evidence of presence and income should be retained?
To clarify the scope of your request, also consult our tax section.
And for your situation?
Before choosing the handover date, gather your current engagement letter and upcoming deadlines. Ask the new firm for a takeover plan, a separate budget for historical records and a written allocation of cross-border files. Search our directory for the professional suited to your needs, then ask them for an engagement and a detailed quotation.
Sources and verification
References consulted on 20 September 2026. Official procedures specify the applicable conditions and exceptions.
- Guichet.lu — profession d’expert-comptable
- ACD — conventions fiscales internationales
- Guichet.lu — dépôt des comptes annuels au RCS
This guide explains a general process. The applicable rules depend on your situation; it does not constitute personalised advice. Report a correction.
Your next step
A specific need deserves the right contact
Accounting, taxation, company formation or payroll: prepare your questions, then search the directory for the professional who can review your situation. Check their assignments and status before entrusting them with your file.