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Why do Americans have to file taxes, even if their only source of income is from a regular job?
Politics is certainly part of the equation, in two ways that I can think of. These don't necessarily reflect my views; just trying to explain as I see it. First, there are a lot of interests in having the current, convoluted tax system entrenched. ProPublica did a piece talking about the question you're asking, and Intuit, makers of the popular tax software TurboTax, is mentioned as someone who lobbied heavily to keep the kind of system you describe out. It's spun as increasing the size and cost of government (which, I guess, is true - someone has to do the work if you aren't filing) while opening up possibilities for error, but the piece portrays the companies as being more interested in preserving the status quo. Second, plenty of people don't like the idea that taxation is done automatically, out of sight and out of mind. An issue that illustrates this is airline pricing. Consumers don't like seeing a $19 fare advertisement and then finding out that they'll actually have to pay $50 after the taxes are added. However, those in the airline industry and those who are generally against taxes don't like the idea that a tax can be added without the consumer really knowing that the government was responsible for the price increase. You sometimes see this with gasoline prices, where taxes are built into the price per gallon. My home state of Pennsylvania recently raised the gas tax without anyone really noticing since the overall price was dropping dramatically at the time. Contrast that to Pittsburgh-area bars who were able to very specifically pin an alcohol tax on its creator. Point being, direct deposits with automatic deductions already take most of the thinking out of taxation. Those in that situation really only think about their income in terms of the amount that shows in their bank account. For some, that time of filing taxes is the one time a year where you actually get to reflect on the amount of money you're paying the government for its services. The more automatic taxation is and the less that the public thinks about it, the easier it is for the government to raise it without people noticing.