Arguably it's not really comparable because of country size etc. but I really love the Portuguese IRS system. You log in from your PC, press a button (if you wa

Arguably it's not really comparable because of country size etc. but I really love the Portuguese IRS system. You log in from your PC, press a button (if you want), and the system auto-fills all of your tax data for you. You can then check that everything is in order, add deductions and proofs if you like or need. Press simulate to check what tax returns you will get. You may save and print everything. There is a help system built-in that explains every form. When you're finished with your review, press send, and the system will validate your forms and send them to the IRS. Usually everything is filled-in correctly anyway. Takes 5 minutes for ordinary tax payers like me.