In the UK tax system, personal allowance is the threshold above which income tax is levied on an individual's income. A person who receives less than their own personal allowance in taxable income (such as earnings and some benefits) in a given tax year does not pay income tax; otherwise, tax must be paid according to how much is earned above this level. Certain residents are entitled to a larger personal allowance than others. Such groups include: the over-65s (followed by a further increased allowance for over-75s), blind people, and married couples where at least one person in the marriage (or civil partnership) was born before 6 April 1935. People earning over £100,000 a year have a smaller personal allowance. For every £2 earned above £100,000, £1 of the personal allowance is lost; meaning that incomes high enough will not have a personal allowance.