I think tax forms are a pain whatever country they are for. I have to do three! Two for the UK and one for France. All of them are difficult and frankly I guess at some of the questions or just write zero because I don't have the foggiest idea what the question is asking me for! The calculations are generally trivially easy - the difficult bit is understanding the jargon. The guideline notes they supply with these things also tend to be written in gobbledygook English (or French) translated from Klingon via an illiterate Vulcan who only understands Japanese.
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I've left WP indefinitely.