From the advice site,don't know if any of this applies.If only one person lives in a property they will get a 25% discount on the council tax bill. When working out how many people live in a property, some people are not counted. These are called disregarded people. If everyone who lives in the property is disregarded, there will still be a council tax bill, but there will be a 50% discount. People are disregarded when they are:-
aged 17 or under
living in the property temporarily and who have their home somewhere else
prisoners
in detention prior to deportation or under mental health legislation
defined as a severely mentally impaired person
full-time students on a qualifying course of education
a spouse or a dependant of a student and a non British Citizen who is not allowed under immigration rules, either to work in the UK or claim benefit
Student nurses/Project 2000 student nurses
young people on government training schemes, apprentices, or foreign language assistants
hospital patients who live in hospital
living in a residential care home, nursing home, or mental nursing home where they receive care or treatment
living in a hostel which provides care or treatment because of a person’s old age, physical or mental disability, past or present alcohol or drug dependence or past or present mental illness and in England and Wales a bail or probation hostel
carers
care workers
staying in a hostel or night shelter, for example, in a Salvation Army or Church Army hostel
school or college leavers still aged under 20 who have left school or college after 30 April. They will be disregarded until 1 November of the same year whether or not they take up employment
aged 18 and someone is entitled to child benefit for them. This includes a school or college leaver in remunerative work, or a person in local authority care
members of a religious community
members of visiting armed forces and their dependants.
http://www.adviceguide.org.uk/index/life/tax/council_tax.htmDave