The central inquiry revolves around whether the client, as a non-resident, is required to pay taxes in the United States and, if so, what tax forms need to be filed. One possible form that was initially considered is the W-9, which is typically used to request taxpayer identification information from U.S. persons. However, since the client is a non-resident, the more relevant form is likely the W-8BEN, which is used by non-resident individuals to certify their foreign status and claim any tax treaty benefits. Determining the specific requirements is essential for ensuring proper tax compliance and avoiding unnecessary penalties.