I hope not because I’ve been doing my US taxes on Linux for 15 years.

It’s probably a specific windows desktop app, probably TurboTax by intuit, the company that lobbies to make filing your taxes hard and to destroy any free simple government app to file taxes.

So, not sure why they’d complain about not being able to help shoot their foot off but we all have preferences. :shrug:

Yes, it is the unfortunate reality of the US. You either fork over all your data to tax preparation companies on the web or pay them to use windows/MacOS software. There is still paper filing by doing taxes by hand, but that's a bit too inconvenient. Free online filing is restricted to $89k annual income.