The 30% withholding tax is generally imposed on payments from U.S. persons to foreign persons relating to U.S. source income. If your company is performing services and all of those services take place outside the U.S. then the income is foreign source income and no withholding is required.
The W-8BEN is intended to communicate information from the foreign person to the U.S. person so that the U.S. person is allowed to withhold at a rate less than 30%. There are many exceptions to the 30% withholding, depending on the type of income and the status of the recipient. The W-8BEN covers many of these exceptions.
In your case, if all of the services are performed outside the U.S. then a W-8BEN is not even required because it is not U.S. source income. However, your client doesn't necessarily know where your company is performing the services. Therefore, it is not unreasonable for them to ask for a W-8BEN.
In these circumstances, you would need to complete Part II of the form and obtain an EIN (Form SS-4). You would probably check boxes 9a, 9b, and 9c (depending on your circumstances). On line 10, assuming your company does not have a permanent establishment in the U.S. you would specify the article in the treaty (I think Article 5) relating to permanent establishments.
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