What this notice is about We changed your mailing address because we received an employment tax return or Form 8822-B, Change of Address or Responsible Party – Business, with an address different from what’s on our records. We send CPs 148 to both the employer’s former (148B) and new (148A) addresses to confirm the address change. What you need to do If the address change is correct, you don’t need to do anything. If the address change is not correct, please return the notice to us with a completed Form 8822-B, Change of Address or Responsible Party - Business. PDF You may want to Keep the notice for your permanent records. Submit a Form 8822-B when you need to update your address in the future. Frequently asked questions Why did the IRS change my address? We update an address when we receive: Form 8822-B An employment tax return with an address different from what's on our records. Notification of any address variation from the address of record for the business entity, e.g. interchanging "Street" for "St." Reference Tools Publication 5027, Identity Theft Information for Taxpayers PDF Full list of tax forms and instructions Need Help? You can authorize someone to contact the IRS on your behalf. See if you qualify for help from a Low Income Taxpayer Clinic. If you can’t find what you need online, call the IRS number at the top of your notice or letter.