The large majority of letting agents in England have seen a fall in revenue since the tenant fees ban last June 1.
In a survey of more than 200 letting agents, 17% said revenue was down between 21% and 30%, while 10% reported losses of more than 30%.
Just under a third (31%) said they had lost between 10% and 20% while 28% said they had lost up to 10% of their revenue.
Only 15% said that the ban has had no impact on their revenues.
Rental platform Goodlord has compiled the figures from a survey sent out on January 8, and said that the statistics cover the seven months of the ban.
These figures align closely with what letting agents predicted in a survey that Goodlord carried out last summer, when 31% expected to lose 10%-20% of revenue, and 32% expected to lose up to 10%.
However, there was a gap between the 10% who last summer predicted that there would be no impact, and the 15% which have actually found this to be the case.
Goodlord said that this suggests that these businesses were “well-prepared and adapted their revenue model successfully”.
The Goodlord survey has also highlighted agents’ ongoing concerns, including policing of the ban, with 35% worried about compliance and the penalties.
Just over half the agents (53%) expressed concern about the possible introduction of further legislation, such as rent controls.
Tom Mundy, chief operating officer at Goodlord, said: ““It’s clear that the Tenant Fees Act has had a significant impact on the industry.
“These figures show just how pivotal this legislation has been, with few emerging unaffected by the changes.
“With further pieces of key regulation due in 2020 and beyond, it’s essential that agents stay nimble and prepare their business models for more change to ensure they continue to prosper this decade.”