Navigo Attestation Mensuelle ^new^ May 2026

You can use this as a website FAQ entry, an email explanation, or a social media caption. If you are a regular user of the Île-de-France public transport network (RER, Metro, Bus, Tram), you know the Navigo monthly pass is a valuable tool. But what happens when a fare inspector asks for proof of payment beyond just the card? Or when your employer asks for proof of your transport expenses?