No. In Ireland, registering a tenancy with the Residential Tenancies Board (RTB) does not mean that the deposit is lodged with, or held by, the RTB. The landlord or letting agent normally holds the deposit and should return it at the end of the tenancy, less any lawful deductions supported by appropriate evidence. If you disagree about the deposit or deductions, you can use the RTB’s dispute resolution process; the outcome will depend on the facts of the individual tenancy.