A landlord may seek to deduct unpaid utility charges from a deposit where the tenancy agreement makes you responsible and there is evidence that the amount is due. They should provide a clear calculation, such as final bills, meter readings or invoices, and should not make an arbitrary deduction. If the utility account was in your name, the provider may pursue you directly, depending on its terms. Disputes about whether a deduction is justified can ultimately be considered through the RTB dispute resolution process; consider getting legal advice for a disputed or substantial amount.