The USA is almost unique in taxing U.S. citizens even when they live abroad. This means that expats who earn over $10,000 ($10,300 for 2016, to be precise, or just $400 of self-employment income) are required to file a U.S. federal tax return, regardless of where their income originates, or whether they are also paying taxes elsewhere.

While expats still have to pay any U.S. tax they may owe by April 15th, they have until June 15th to file, with a further extension available on request to October 15th. Read More