Just for comparison: in Brazil the _Receita Federal_ (IRS equivalent) provides a free multi-platform* Java desktop app for filing your taxes. The UI isn't great* and if you do complex stock trading it can be a pain to add the necessary information, but for the vast majority of people it works just fine. It also shows if it is better to use the standard deduction or the itemized deductions for your particular case and…
Swiss one was way easier to understand by far. As a side effect of doing those taxes, it was easy to see my actual wealth and my actual net income for the year. Which in America is a sin.