Another related question: I have been using my SS number for my 1099 work W-9 and billing invoices I send out. Now with setting up my SOLO 401k I also have an EIN. Should I use the EIN for my 1099 work? Does it matter?
It really won't matter as long as you use the same number for all payments. Since you have begun with the SSN, keep it that way or you'll receive payments under 2 different ID numbers and the IRS will be expecting 2 different returns (schedule C's). Can be handled by assignment of income from one form to the other (we commonly have to do this for doctors) but it's kind of clunky.
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