Why a flat tax isn't 'fair':  The arguments in favour of a flat tax argue that it is more 'fair' than other forms of taxation because it theoretically treats all persons and all forms of income equally by taxing them all at the same rate. This firstly fails to explain why any arbitrary percentage at which the tax is set is necessarily the 'fair' number and thus why everyone should receive the wonderful privilege of paying that exact number and not another based upon their income, expenditure and circumstances. The effect of the tax upon different individuals in different circumstances is thus key to the tax's supposed 'fairness', and to the undermining of this argument. For example, say both Mr Smith and Mr Jones earn £50,000 a year. However Mr Smith is a young man with few assets who relies upon his personal savings to finance a future business, and Mr Jones is an old man who has already built up or inherited £500,000 in assets. There is no clear reason why it is 'fair' for them to both pay the same rate of taxation despite their vastly different circumstances and the effect that the tax would have upon each of them, as Mr Jones' built-up wealth is protected, but Mr Smith's ability to build up assets and start a business in the first place is undermined. Or take the example of a sick man and a healthy man with the same income, but one of whom thus has much higher medical costs to pay. In the status quo they can be taxed differently (by allowing for income tax deductions for healthcare expenditure), however under a flat tax they would both be taxed the same, and it this would severely harm the sick man. Therefore, it seems counter-intuitive that in a world where all individuals are not the same and rates of taxation impact in highly different ways upon individuals depending on their differing circumstances (over which they may have little control), that every individual should pay exactly the same rate of tax, as if they were all the same. That hardly seems 'fair'.