People still file sales taxes, just not individual. It's the duty of the business doing the selling to collect the sales tax, file, and transmit those funds to

People still file sales taxes, just not individual. It's the duty of the business doing the selling to collect the sales tax, file, and transmit those funds to the state. As long as we have taxes we will need a tax collector (i.e. the IRS) to handle all the filings and to make sure people are paying their taxes. The IRS absolutely could be doing more. They could let you log-in to a portal with your tax return prefilled out based on all the filings done by your employer. But the tax preparation industry has lobbied against this, and the IRS is underfunded (they still haven't processed all of last year's paper returns). Also a lot of states that don't have income tax, receive lots of federal funding.... Which comes from income taxes.