The Icelandic government also pre-computes taxes. It takes me maybe five minutes to do taxes in Iceland and I don't even speak Icelandic.

Multiply that several times to do my US taxes and add some extra fees on top because I use tax prep software.

The really funny bit is I never owe anything in the US since I solely live and operate in Iceland so all that's covered by my Icelandic taxes, but as a US citizen I'm required to file regardless.