The IRS requires a flat 30% withholding on ALL types of payments to foreign national individuals UNLESS: The individual has a U.S. tax identification number (SSN or ITIN) and qualifies for a tax reduction under the tax treaty between the U.S. and their country of tax residency.
Payments to a foreign corporation in exchange for personal services performed in the US by either a US citizen or alien is considered to be US-sourced income and is usually subject to withholding. (Can be wages or self-employment income.)
Employers are required to check the work authorization of employees and can face fines and penalties for failing to do so or for hiring employees who they know do not have work authorization. All immigrants regardless of legal status are able to earn a living as independent contractors by using an ITIN number.
All persons ('withholding agents') making US-source fixed, determinable, annual, or periodical (FDAP) payments to foreign persons generally must report and withhold 30% of the gross US-source FDAP payments, such as dividends, interest, royalties, etc.
Exemption from withholding To qualify for this exempt status, the employee must have had no tax liability for the previous year and must expect to have no tax liability for the current year. A Form W-4 claiming exemption from withholding is valid for only the calendar year in which it's furnished to the employer.
Foreign independent contractors must submit IRS Form W-8BEN (for individuals) or IRS Form W-8BEN-E (for entities) to the US company they work for. This form certifies the contractor's foreign status and can help reduce or eliminate withholding tax on payments. Purpose: Certifies foreign status.