Yes, a tenant can generally refer a deposit-retention dispute to the Residential Tenancies Board (RTB), including where the landlord alleges rent arrears, damage or unpaid bills. Keep the tenancy agreement, payment records, messages, photographs and evidence of the property’s condition, as the outcome depends on the facts and evidence considered through the RTB process. Try requesting an explanation and repayment in writing first, then check the RTB’s current application guidance and time limits. For a complex or high-value dispute, consider getting advice from a solicitor or a tenant support service.