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However, when applied as a precondition of membership in society or on products bought by the poor, it functions as a potentially extreme regressive tax in that it doesn't consider a person's ability to pay unless further adjustments are made (e.g. the way that the AustralianHECS system applies tertiary education charges from a fixed schedule, but defers payments according to people's ability to pay by piggybacking payments as a progressively based surcharge on income tax). This can result in the lower income taxpayers paying much higher proportions of their incomes on taxes, incomes that are less disposable in that they must also pay a larger percentage of their incomes on necessities. Because of this, fixed taxes are better suited to funding governments which are not responsible for providing very much for the citizens and therefore do not have much to pay for.