On arrival, Portugal applies Certificado de Bagagem (Portuguese consulate) under EU customs framework (jurisdiction-specific), though an intra-EU move needs no customs entry at all. Import VAT in Portugal is 23%, and relief is what keeps your household goods out of that charge. Shipments normally arrive through Lisbon or Leixões (Porto).
This page covers what actually changes on the France → Portugal route: what you will pay, how long the shipment is at sea, the paperwork Portugal customs expects from a departure in France, and what to do about pets, a vehicle and somewhere to live when you land.
Departures from France normally load at Le Havre, Marseille, Antwerp / Rotterdam (road feeder). Moves within the EU need no customs entry. Exports beyond the EU require a Delta-G export declaration filed by your remover. Surveys are typically in person, with volume quoted in m³ and a written devis. The corridor covers roughly 613 nautical miles.