Only taxis licensed by the Municipality of Rome charge the fixed €55 inside the Aurelian Walls. Cars licensed by the Municipality of Fiumicino run the meter instead and the same trip can cost €25 or more extra. Both are white with a TAXI sign, so the difference is not visible from the kerb.
Roma Capitale's tariff of June 2026 (Capitoline resolution no. 157 of 21 May 2026) sets the fixed fare at €55.00. Forum posts and older travel sites quoting €48 or €50 are out of date, and a driver quoting €50 is not doing you a favour.
Outside the walls the fixed fare does not apply. Inside the ring road the ride is capped at €80, and the published fares for the stations are Ostiense €50, Tiburtina €60 and Ciampino €55. If your hotel is outside the walls, the €55 everyone quotes is not your price.
Unlicensed drivers work the arrivals halls at Fiumicino and quote a price well above the meter. Licensed taxis wait at the official rank outside the terminal exits, and booked transfers meet you with a name board.