In accordance with the U.S. tax law and IRS regulations, it is a requirement for the merchants to collect W-9 forms from all affiliates who are US citizens. It is a way for the government to ensure that taxes are being paid. Learn more about the W-9 form here: https://www.irs.gov/forms-pubs/about-form-w-9
To require your affiliates to fill out and send you the W9 form, please enable the function by going to Settings > General > Others > enable Require W-9 form submission > Save changes.
After that, the option to enter tax information will show up in affiliates' accounts (Settings > Tax information).
From there, the affiliate would need to confirm that he/she is a US citizen. The 3 following steps will show up for the affiliate to follow: download the W-9 form, fill out the form and upload the filled form.
Note: It is required to provide the affiliate's signature and date on the W-9 form. To sign the form, open the PDF file on a PDF reader software (such as Foxit Reader, Adobe Reader,...) and find the PDF sign tool.
We hope this is helpful for users. We will keep working on adding more tax forms for other regions as well.