The Residential Tenancies Board has apologised for delays in responding to landlords and letting agents who have been trying to register tenancies with the agency.

The RTB said it will be refunding all late fees paid to the RTB for new tenancy registrations "given the genuine difficulties among its user community".

Landlords and letting agents have faced ongoing challenges trying to interact with a new software system for registering tenancies since its introduction in November last year.

They say they have had problems registering themselves on the site, transferring or linking existing tenancy registrations from the old system to the new.

It has been further complicated by the obligation to register tenancies annually.

In a statement on its website, the RTB said it continues to experience high volumes of calls, webchat, and emails.

It says it recognises that this is "particularly testing and frustrating for landlords and agents" and the agency apologised for the long waiting times to get through to our call centre and web-chat agents as well as for the delays in receiving an email response.

"We would like to reassure our customers that action is underway to improve the situation. The RTB would like to remind customers that any late fees incurred on tenancies with a Tenancy Commencement Date on or after 4 April will be refunded in due course."

The RTB thanked customers for their continued patience as it works through this period of transition.