International tax treaties govern the allocation of taxing rights between two states when a taxpayer, whether an individual or a business, earns income in a country other than their residence. Their scope extends far beyond income tax: some also cover wealth, inheritances, and gifts, with allocation logics that vary according to the nature of the relevant flows. Understanding their mechanics requires distinguishing several legal layers, from the OECD model to bilaterally negotiated clauses.
Tax credit or exemption: two methods with distinct tax effects
The purpose of a tax treaty is to eliminate double taxation, but the chosen method radically changes the outcome for the taxpayer. Two mechanisms coexist in most bilateral treaties.
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| Criterion | Exemption method | Tax credit method |
|---|---|---|
| Principle | The residence state waives taxing foreign-source income | The residence state taxes worldwide income but deducts tax paid in the source state |
| Effect on rate | Foreign income can be considered for the effective rate (exemption with progression) | The final taxation corresponds to the higher of the two national rates |
| Result for the taxpayer | Nearly complete neutralization if the foreign rate is higher | No additional cost compared to a purely domestic situation, but no savings either |
| Common usage | Real estate income, salaries from employment exercised abroad | Dividends, interest, royalties |
The distinction is not trivial. The same salary earned in a low-tax state will produce a very different result depending on whether the treaty provides for exemption or tax credit. With exemption and progression, foreign income raises the rate applicable to other income of the taxpayer without being taxed itself. With tax credit, the final taxation equals the highest rate of the two states.
For those wishing to understand international tax treaties on Buzzorama, this distinction between methods forms the practical foundation to master before any optimization.
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Hierarchy between tax treaty and French domestic law
A point often misunderstood is the primacy of the treaty over national law. Under French law, Article 55 of the Constitution grants ratified international treaties authority superior to that of laws. Applied to taxation, this means that a bilateral treaty can neutralize a provision of the General Tax Code.
The analysis of a concrete case unfolds in two stages. First, domestic law determines whether an income is taxable. Then, the applicable treaty may restrict or eliminate this taxing right. The treaty never creates new taxation: it only limits or allocates a right that already exists under domestic law.
This mechanism has a direct consequence: if domestic law does not provide for tax on a type of income, the treaty will not add one. Conversely, if French law taxes an income but the treaty assigns the right to tax exclusively to the other state, the French tax administration must yield.
Tax residence and dual residence: the mechanism for determining residency
Tax residence is the operational starting point of any treaty. It determines which state is the residence state and which state is the source state. Situations of dual residence, common in international mobility, are resolved by hierarchical criteria inspired by the OECD model.
- The permanent home: the state where the taxpayer has a durable dwelling takes precedence first.
- The center of vital interests: in the absence of an identifiable permanent home in a single state, it is the place of the closest personal and economic ties that decides.
- The habitual stay, then nationality: if the previous criteria do not allow for a conclusion, the number of days of presence and then nationality serve as subsidiary criteria.
- The amicable procedure: as a last resort, the competent authorities of both states must agree, which can take several months.
The center of vital interests remains the decisive criterion in the majority of disputes. It combines the location of assets, the main professional activity, the schooling of children, and family ties. French courts interpret this criterion factually, on a case-by-case basis.
Cross-border asset structures
For holders of real estate or shares in multiple countries, the applicable treaty varies according to the nature of the transmitted asset. Inheritances and gifts follow their own distribution rules, distinct from those that apply to current income. Some treaties cover inheritances, others do not, leaving the domestic law of each state to apply without conventional filter.
Administrative cooperation and the fight against tax evasion
Tax treaties are not limited to the allocation of taxing rights. They also organize cooperation between tax administrations, a facet whose importance has significantly increased in recent years.
Three mechanisms structure this cooperation:
- The exchange of information: upon request or automatic, it allows one state to obtain banking and tax information held by the other state.
- The amicable procedure: it offers the taxpayer a remedy when the application of the treaty leads to taxation that is not compliant with the treaty.
- The anti-abuse clauses: introduced by the OECD’s multilateral BEPS instrument, they aim to prevent the artificial use of a treaty to benefit from unanticipated tax advantages (treaty shopping).
The multilateral BEPS instrument simultaneously modifies hundreds of treaties without requiring bilateral renegotiation, which accelerates the update of the global treaty network. This multilateral treaty allows signatory states to incorporate limitation of benefits clauses and a principal purpose test to filter abusive arrangements.
The respective weight of each mechanism, exemption, tax credit, residency determination, or anti-abuse clause, depends on the specific treaty applicable and the type of income or assets involved. No generic reading replaces the examination of the relevant bilateral text, article by article, compared to the domestic law of each concerned state.