Article 1663 of the French General Tax Code
1. The direct taxes, products and assimilated taxes, referred to in the present code, are payable thirty days after the date on which the assessment is levied. 2. Moving outside the jurisdiction of the department responsible for collection, unless the taxpayer has provided proof of his new address, and a voluntary or forced sale will result in the tax being payable immediately in full, as soon as the tax assessment…