Who is require to withhold? • Withholding Agent.Yes, overseas contractors are responsible for paying taxes in their home country. Start the process of international tax relief today and call us at 410-497-5947 or fill out our brief contact form for your free initial consultation. This article discusses a U.S. businesses potential obligation to withhold U.S. taxes to a foreign contractor. Call SF Tax Counsel today. Use Form 1120-F to report the income, gains, losses, deductions, credits, and to figure the U.S. income tax liability of a foreign corporation. This is recorded and reported each tax year via IRS Form 1042S. When a qualified U.S. worker applies, you must employ them until 50 percent of the work period specified in the work contract has passed.