Some countries do already. In Norway, you get a your tax papers (well, paper; it's only one sheet) pre-filled. You only have to take action if they got it wrong

Some countries do already. In Norway, you get a your tax papers (well, paper; it's only one sheet) pre-filled. You only have to take action if they got it wrong. At least this works for normal employees. It gets slightly worse when you have your own company.