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Why do Americans have to file taxes, even if their only source of income is from a regular job?
For two reasons: 1- People are entitled to deductions and credits that your employer cannot possibly know. Only you as an individual know about your personal situation and can therefore claim these deductions and credits by filing income tax returns. 2- Me telling you that you made $100,000 last year is not the same as telling you that you made $125,000 last year, but someone took $25,000 out of your pocket. Tax season is the one time of the year when citizens know exactly what chunk of their hard earned money was taken by the government, creating more collective awareness about taxation and giving politicians a harder time when they propose raising taxes.