Most of the rest of the developed world has the national tax agency compute the tax filing for you based your family ages, employer-filed work income and financial institution income.The annoying thing is that the U. S. does this, too. They just wait until the numbers don't match before they tell you what their number is. Hey, why don't you tell me that number up front and save us a lot of trouble? Because I just paid several thousands dollars recently because our numbers didn't match up. The IRS already knew, "here's your bill". A lot of back-and-forth could have been saved if the IRS said up front before I filed, "here's what we've got, just to give you a ballpark figure to work with and let you know if we're lining up, or have a problem."