Tax residence, international tax treaties, and the mechanisms you need to know to avoid double taxation.
An employee's expatriation doesn't automatically change their tax residence. Yet this misconception remains widespread. Many employers believe a staff member becomes a tax resident of the country they work in as soon as they leave France. Conversely, some employees keep declaring all their income in France when they should be taxed in their host country. These situations can lead to double taxation, back-taxes, penalties, or disputes with tax authorities.
What is tax residence?
Tax residence is the state with the primary right to tax a person's income. Contrary to popular belief, it doesn't depend solely on home address or place of work; it results from an analysis of several criteria set out in national legislation and international tax treaties.
The criteria considered
The home base — where the employee habitually lives and where their family resides. The centre of economic interests — main place of activity, investments, main income, assets. Length of presence — the number of days spent in each country is an important factor, but never sufficient on its own.
The role of international tax treaties
When two states simultaneously consider a person a tax resident, tax treaties determine which country takes priority, thereby avoiding double taxation and allocating taxing rights between states.
What are the consequences for employers?
The company must take tax residence into account to correctly organise payroll, tax withholding, reporting obligations, and the choice of Split Payroll or Shadow Payroll. A poor analysis can lead to processing errors over several years.
Most common mistakes
Departures organised without a prior tax study, confusion between social and tax residence, incorrect withholding at source, incorrect application of tax treaties, insufficient documentation, changes in circumstances not taken into account.
Best practices to secure an expatriation
Analyse the employee's family situation, examine the length of the assignment, review applicable tax treaties, clearly define remuneration terms, keep complete documentation of decisions made, and regularly review the situation as the assignment evolves.
Conclusion
Tax residence is one of the pillars of any international mobility. It can never be determined solely on the basis of the number of days spent abroad or the employee's address. By anticipating these questions before departure, the company protects its employees, secures its international payroll and significantly reduces the risk of double taxation.