A law firm in my office building that rarely uses my services sent an email requesting my W9. I declined saying they made a mistake. I think they also once had a rude guy call and ask for one as well.
No company asks me for my W9. I’m not their contract service provider. I just provide very rare notarizations. They are supposed to send me a 1099 form of what they paid me in 2024 which I’m sure was zero.
The 1099 form that you receive from the companies for which you provide services requires the company to report the wages paid during the year for each service provider. That information includes you EIN/SSN/TIN in addition to other identifying/contact information. The W9 is the way they collect that information from you to correspond to the requested information from them by the IRS. That very rare notarization is a service that you provide for which you are compensated. Most companies will track every penny and report it. A threshold of $600 is required to be reported to the IRS. The W9 is simply you playing your part in this collaboration.