U. S. Tax Information for Foreign Vendors - Withholding Rules and W-8/W-8233 Forms

Sep 19, 2026

U.S. tax guidance for UC Davis vendor payments to foreign entities covers IRS requirements for withholding, including a default 30% federal income tax withholding unless treaty or eligibility conditions are satisfied. The instructions distinguish services performed inside versus outside the U.S., specify when reporting and withholding may apply, and explain which W-8 series forms vendors use based on payment type and status. It also clarifies treatment for goods (no withholding) and outlines documentation needed for treaty relief or exemptions.

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U.S. Tax Rules for Payments to Foreign Vendors

Withholding Requirements and Exemptions

Services Performed Outside vs. Inside the U.S.

Required W-8 Series Forms and Key Uses

U. S. Tax Information for Foreign Vendors UC Davis uses both domestic and international companies for vendor services. There are specific tax rules related to payments to international companies just as there are rules for payments to foreign individuals. The Internal Revenue Service (IRS) requires that all payments made to foreign vendors be made in accordance with IRS regulations. These regulations require that when services are provided inside the U.S. taxes be withheld from payments made to foreign vendors unless the income is exempt under a provision of a tax treaty between the foreign vendor's country and the U.S. Payments made to foreign vendors will be subject to U.S. federal income tax withholding of 30 percent unless: 1. Appropriate IRS forms have been completed and submitted to the University, and 2. Payments made to the foreign vendor are a. Exempt due to a tax treaty b. Are effectively connected with the conduct of a trade or business in the U.S. or [c. Made to a foreign entity with U.S. tax-exempt](c. Made to a foreign entity with U.S. tax-exempt) status. Note: These instructions relate only to services, they do not apply to purchase of goods. There is no tax withholding requirement for goods shipped from abroad as the ownership of the goods would pass to the University. Services Performed Outside the USA: If the vendor is located outside the U. S and all services are performed outside the U. S., then this is considered non-taxable foreign source income for the vendor and there is no withholding of taxes by the University. Services Performed Inside the USA: If the foreign vendor provides services to the University inside the U. S. there are reporting and possibly tax withholding requirements. Foreign vendors must submit a US withholding certificate (W-8 series of forms) with an Employer Identification Number (EIN), Individual Taxpayer Identification Number (ITIN) or Social Security Number (SSN) in order to claim an exemption from or reduction in withholding. The specific W-8 form used by a foreign vendor depends on the type of payment being paid and the status of the business itself. IRS Tax Forms in the W-8 Series: Form W-8BEN-Certification of Foreign Status of Beneficial Owner for Unites States Tax Withholding for Individuals. Form W-8BEN is used by foreign vendors who are individuals to confirm that they are not U.S. taxpayers. The vendor must provide form W-8BEN even if the vendor is not claiming a tax treaty reduction or exemption from withholding. To claim a tax treaty exemption, the vendor must also submit form 8233. For a valid tax treaty exemption, the recipient must provide a U.S. tax identification number. [http://www.irs.gov/pub/irs-pdf/fw8ben.pdf](http://www.irs.gov/pub/irs-pdf/fw8ben.pdf) [http://www.irs.gov/pub/irs-pdf/iw8ben.pdf](http://www.irs.gov/pub/irs-pdf/iw8ben.pdf) Form 8233-Exemption from Withholding on Compensation for Independent and Certain Dependent Personal Services ofa Nonresident Alien individual. This form is used by individual vendors who are eligible for tax treaty benefits to claim exemption from U.S. federal tax withholding. [http://www.irs.gov/pub/irs-pdf/f8233.pdf](http://www.irs.gov/pub/irs-pdf/f8233.pdf) [http://www.irs.gov/pub/irs-pdf/i8233.pdf](http://www.irs.gov/pub/irs-pdf/i8233.pdf) Form W-8BEN-E-Certification of Foreign Status of Beneficial Owner for Unites States Tax Withholding for Entities – This form is used by foreign organizations to certify their status under the Internal Revenue Code (IRC) Chapter 3 which requires Withholding of Tax on Nonresident Aliens and Foreign Corporations on US source income. It also enforces reporting on certain foreign accounts under the Foreign Account Tax Compliance Act (FATCA) . Entities are required to provide their identifying information as well as FATCA classification type in Part I, and certify in Part XXIX that the entity as not a US person. Part III of the form is used to claim a

FAQs

When does UC Davis withhold U.S. federal income tax from payments to foreign vendors?

Payments to foreign vendors are subject to U.S. federal income tax withholding of 30% unless required IRS forms are completed and the payment qualifies for an exemption or reduction under treaty or related conditions.

Do the withholding rules apply to purchases of goods?

No. The instructions state they relate only to services and do not apply to purchase of goods shipped from abroad, because ownership passes to the university.

Which W-8 forms are used and how do they relate to vendor status?

The document explains that the W-8 series depends on payment type and whether the vendor is an individual or an entity. For example, W-8BEN is for foreign individuals, W-8BEN-E is for foreign entities, W-8ECI is for effectively connected income, and W-8EXP is for foreign governments or other foreign organizations.

Sep 19, 2026

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