Vendor won't supply tax id
vendor will not provide me his tax ID - what do I do on 1099 reporting
vendor will not provide me his tax ID - what do I do on 1099 reporting


You withheld 28% from his payments as backup withholding when he hadn't returned the completed W-9 before you issued the first check, right? Yeah, no one else thinks to do that, either. :)
If you're never going to pay him again, you honestly don't have much leverage. If you're ever going to pay him again, the 28% haircut should work to get the number from him.
The IRS will assess the "didn't file an accurate 1099" penalty if you file a 1099 with a missing ID number. If you don't file the 1099 at all, they'll only assess it if they audit you.
I Have the same issue. I have a few vendors I cant get the tax ID from. Can I just run the 1099 forms for everyone else and go back later to run those if I get the Tax ID from them? Or should we just leave them out.....