The vast majority of Foreign Residents share a common trait: most, if not all, of their livelihood comes from outside of Portugal. Great confusion and disinformation abound regarding such income from abroad. Before analysing the different requirements surrounding Individual Income Tax (IRS) in Portugal, it is useful to dispel some of the myths and establish a few of the basics regarding Portuguese taxation and the obligations of the Foreign Resident. So the first question to consider is: Who is required to become resident for tax purposes in Portugal?