An EIN, or Employer Identification Number, is the IRS’s federal tax ID for a business or other entity. Think of it as a business version of a Social Security number.
You usually need one if your business has employees, pays certain federal taxes, or is organized as a partnership, a corporation, an LLC that files like a corporation, or certain trusts and estates. Even when you do not strictly need one for federal tax purposes, you may still want one for banking or state tax paperwork — many banks ask for it before opening a business account.
If you are a sole proprietor with no employees, you may be able to use your Social Security number instead. But if you hire someone, change your business structure, or start filing different kinds of business taxes, the IRS may require a new EIN.
The safest rule is simple: if your business is becoming a separate legal or tax entity, check the IRS EIN rules before assuming your old number still works. Applying is free directly through the IRS — never pay a third party for the number itself.
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