W-9 and Vendor Onboarding – Propel Career Lab by Dinesen Learning

W-9 and Vendor Onboarding

Form W-9 and TINs, Part 2
ByJason Dinesen February 3, 2026August 13, 2026

Let’s look at how the IRS uses the information off the 1099s you file. We wrote about this in part 1 of “Dealing with Corrections,” and it’s a good encapsulation. When you file 1099s with the IRS, they put that information into their databases. In other writings, we delve into “how” they catalogue the information,…

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W-9 and Vendor Onboarding

Form W-9 and TINs, Part 1
ByJason Dinesen January 27, 2026August 13, 2026

Someone recently asked me why so many accountants and tax pros — CPAs, EAs, etc. — tell single-member LLCs to enter the LLC’s EIN on a W-9 instead of the owner’s Social Security Number. Now, you might read that paragraph and wonder, “What are we even talking about here?” So, let’s start by breaking it…

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