SSN or EIN on W9?

[L]

Appreciate all the great responses, wasn't expecting that much attention!

[southerndoc]

Reviving an old thread here...

If you establish an EIN for your Solo 401(k), on the 5500-EZ form you list the plan's EIN in 2b but do you use the sole proprietor's EIN in 3b as the plan administrator?