Investopedia explains 'User Fee'
Because user fees are more palatable than taxes, politicians may sometimes try to disguise taxes as user fees. However, sometimes the line between user fees and taxes is blurred, as in the case of gasoline taxes being used to fund the Interstate Highway System. Government services and facilities that are supported by user fees instead of by taxes more closely resemble private businesses because it is apparent whether a true demand exists for those services and facilities.
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