[henrikschroder]

Anecdote:

The year I moved to the US I had a pretty complicated tax situation. My company paid for accounting help to get my taxes filed for that year as part of the relocation package. However, the accounting firm had some issues with my Swedish taxes, and told my company it would cost an extra $25k to fully investigate the situation to properly finish my Swedish tax return.

That dragged a bit, so I just called up the Swedish tax agency, explained my situation, and they told me which form to fill out and how, and which rules applied, all in a ten-minute free phonecall.

I'll take that over "APRIL 15TH OR ELSE!!!", which is all you get from the IRS.