What is the dividend withholding rate between Portugal and United States?

Under the Portugal-United States tax treaty, the withholding rate on dividends is 15% for portfolio investors (general rate). A reduced rate of 5% applies when the beneficial owner is a company holding a qualifying ownership stake (typically 10% or more of voting stock). Note that the reduced rate requires the recipient to file the appropriate treaty benefit claim form before payment. This 15% rate compares to a median of 15% across Portugal's 28 active treaty partners, and 15% across United States's 64 active partners.