What is deemed to be a valid invoice in France to be used as expenditure under the Regime Simplifié?

• The name and address of the invoicing company / individual must be indicated
• Your name and French address must be indicated (this includes invoices from stores such as M. Bricolage)
• The date must be shown
• For invoices incurred in France, the "numero siret" of the supplier must be shown - this is the number which confirms a company/individual is formally registered with the French tax authorities
• The invoice amount
• Details of the purchase/service

All of these elements need to be on each individual invoice in order to make them valid, as required by the French tax office.