At a minimum, information must be in the highlighted fields, but other boxes must be completed if the nature of the payment requires it. This guide is intended to simplify the process.Examples of common payments the University makes to foreign nationals visiting or working in the US. Form 1042S is an IRS form used to report amounts paid toand withheld fromtheir noncitizen, nonresident workers. If you employ workers from outside the US, you need to provide them with a W8BEN form. Foreign contractor tax is a withholding tax applicable to most foreign contractors working in Vietnam with a few exceptions. If you have any doubt about the requirement to withhold, go ahead and do it and use a Form 1042. Do you have to send a 1099 Form to a foreign contractor? What do 1099s mean for US citizens abroad? Otherwise, you could be subject to IRS penalties like steep fines and interest.