You should always ensure that the deposit is properly protected in a tenancy deposit scheme; failure to do so can lead to a claim for compensation from your tenant(s) and restrictions on serving notices.
You cannot take money from the deposit without agreement by your tenant or a decision by the scheme. Usual reasons for a landlord retaining some of the deposit include rent arrears, damage to the property or where items on the inventory are lost or broken. You cannot take money for reasonable wear and tear or to fix repairs which were your responsibility.
Our landlord law experts can assist if you need support with a tenancy deposit dispute.