A 50 discount is available for an annexe if it 's used by the occupier of the main building or a member of his or her family. The annexe must be situated within . Council Tax. View or download the Council Tax for Self-Contained Anne. leaflet Discount for anne. occupied as part of the main home or by a relative .If there is any discount or exemption applicable this will be deducted from house '. To qualify for this exemption the annexe must be the home of a dependant .A 50 discount will be available for anne. if it is used by the occupier of the An exemption will apply to the annexe if it is a self contained flat or house and is .