Not just income… In some countries, the principle exists that individuals with a certain nationality are taxed on their worldwide income and assets. The banks pass on the information of the société simple account in its entirety to other countries; the tax authorities of those other countries levy on the whole and not on the part (amount of shares) of the person concerned. From my point of view, it seems important that the société simple foresees any possible issues for this complex matter in its statutes by stipulating that each person concerned must be responsible for the costs associated with or as a result of FATCA and CRS (common reporting standards) and for the taxes that would be levied on the société simple if these are the result of an action by the person concerned (residency abroad, eg.) or a result of legislation imposed by a country of which the person concerned is a citizen.