The IRS has released the 2019 tax year version of Publication 515, Withholding of Tax on Nonresident Aliens and Foreign Entities. This publication contains information on several aspects of withholding to satisfy potential tax obligations of nonresident aliens, one of which is associated with payments from retirement savings arrangements.
Such payments are subject to withholding at a 30 percent rate, unless a more favorable tax rate applies according to the tax treaty between the U.S. and the nonresident alien’s home country. To qualify for a treaty rate, the individual must provide the payor a completed Form W-8BEN, Certificate of Foreign Status of Beneficial Owner for United States Tax Withholding and Reporting.
The treaty rates were formerly included in Publication 515, but are now found directly at the tax treaties page IRS website.