– IRS Form 1040-NR
– supporting schedules, including Schedule D
Nonresident Alien (Foreign person) selling real estate located in the US is subject to tax withholding under FIRPTA. The buyer is obligated to withhold 15% FIRPTA tax on the GROSS Sale price. The 15% may be lower (0% or 10%) depending on the particular situation.
The Foreign Person (Seller) may request for a lower or no tax withholding, by timely filing with the IRS the required Form 8288-B and supporting information.
Check out this IRS site for more guidance