Yes, all official Paris taxis (marked with a "Taxi Parisien" roof light) are legally required to accept cash in Euros. In fact, many older taxi drivers still prefer cash for smaller fares. However, since 2015, French law also mandates that every official taxi must be equipped with a functional credit card terminal and must accept cards for any amount, no matter how small. If a driver claims their "machine is broken" and demands cash, you are technically within your rights to request they take you to an ATM or refuse the ride if they didn't disclose this beforehand. In 2026, most taxis also accept "Contactless" payments via smartphone or card. It is a good idea to carry small denominations of cash ($5, $10, or 20 Euro notes) because while they must accept cards, paying a €10 fare with a €50 note can sometimes be a struggle for change. Also, be aware that for fixed-rate airport transfers (e.g., Charles de Gaulle to the Right Bank), the driver will usually ask for payment at the end of the trip and will provide a printed receipt upon request.