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When the IRS changes a business address in their records, they send a CP 148B to the old address.
They issue a notice of confirmation of an address change to both the former and new address.
If the address change is correct, you don’t need to do anything.
If the address change is not correct, return the notice to them with a completed Form 8822-B, Change of Address or Responsible Party - Business.
They usually update an address when they receive:
Employment tax return with an address different from what's on our records.
Any address variation from the address of record for the business entity, e.g. interchanging "Street" for "St."