I work for a nonprofit and we're improving our vendor onboarding process. We regularly collect W-9s, ACH payment details, tax IDs, and occasionally Social Security numbers from sole proprietors. What secure methods are other organizations using to collect this information? Once received, is Microsoft 365—particularly a dedicated SharePoint site—appropriate for storing these documents with strong access controls, or is a dedicated vendor-management or document-management system a better choice? We're trying to balance security, compliance, vendor convenience, and cost.
2 Answers
Collection is usually where the biggest leaks happen. An emailed W-9 can remain in the vendor’s sent folder, your mailbox, backups, archives, and multiple other systems before anyone applies a SharePoint control. A secure, link-based upload portal that sends the document directly into a controlled repository is safer. Establish a rule that documents received by email are moved into the approved system and the original message is deleted according to your retention policy. Also confirm whether an EIN can be used instead of an SSN for a sole proprietor—reducing the amount of sensitive data collected is the simplest security improvement.
The platform matters, but the operating controls matter just as much: restrict access to the minimum necessary group, require strong authentication, maintain audit logs, define retention and destruction schedules, review permissions periodically, and test the ACH-change verification process. Whether you choose SharePoint or a specialized system, make sure vendors have a secure upload path and that staff know exactly how to handle exceptions.
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