The UK’s four main secondary ticketing agencies have been banned from using certain “misleading” price strategies.
The Advertising Standards Authority (ASA) said they had not been clear enough about extra fees added at the end of the booking.
The four largest sites are Get Me In, Viagogo, StubHub and Seatwave.
Such firms have attracted increasing criticism and last month Google changed the way the sites are listed after pressure from Ed Sheeran’s manager.
Secondary ticketing sites are designed to re-sell tickets to concerts, shows and events where the original buyer can no longer attend.
The ASA’s move is the latest in a string of actions taken against businesses who have been accused of misleading fans by claiming that they are official sellers of tickets, over-charging buyers or selling tickets that are invalid if they are re-sold.
Websites must now make the total ticket price, the VAT-inclusive booking fee and the delivery fee clear from the start.
The ASA has also banned Viagogo from claiming that it is an “official site” after it misleadingly implied it was an official primary ticket outlet rather than a second-hand ticket website.
Viagogo is also banned from offering a “100% Guarantee” claim which the ASA said misleadingly suggested that consumers were guaranteed entry.
The ASA’s chief executive, Guy Parker, said: “Many of us will recognise the frustration of being happy with the initial price of tickets on a secondary website only to be stung by hefty fees when we come to book.
“The message from our rulings is simple and it’s clear: The price you see at the start should be the price you pay at the end.”
A StubHub spokeswoman said: “As a consumer-first ticket marketplace, StubHub supports any measures which make ticket buying easier, more convenient and more transparent for fans.”
It said it would be “fully compliant” with its decision.