@Introspective Introvert wrote:
if my employer asks for my personal SSN and I work the same time as a part-time freelancer/contractor and file my own taxes under my business EIN
You never file your personal tax return under your business EIN. You always use your Social Security number on your tax return. If you have an EIN for the business, the EIN will be shown on Schedule C, in addition to your SSN. The Schedule C is still part of your personal tax return filed under your SSN.
