The first move
Confirm the change is one you made. An address change you did not request is an identity theft signal.
What these letters have in common
These letters exist so you know your account changed. CP148A and CP148B confirm a business address change (one goes to the old address, one to the new). CAF letters confirm a power of attorney was recorded. Account consolidation letters tell you two accounts were merged. CP40 tells you a balance was assigned to a private collector.
If the change is correct, file the letter. If it is not, call the number on IRS.gov for the notice type, not the number on the letter, and say so.
What to gather
- The letter
- Your last filed return with the address and name on it
- Form 8822 or 8822-B if you need to correct an address
- Form 2848 or 8821 if an authorization is wrong
How to write back
Letters in this family are usually answered by phone, online, or with the specific form the notice names rather than a letter. Where a written response helps, the document cover letter covers it.
Notices in this family
| Notice | What it means |
|---|---|
| CP148A | Business address change confirmation sent to the old address |
| CP148B | Business address change confirmation sent to the new address |
| EIN change letters | Confirmation that EIN records were updated |
| Account consolidation letters | Two accounts merged into one |
| CAF letters | Power of attorney or authorization recorded or revoked |
| Authentication letters | Identity confirmation for account access |
| Private collection assignment | Balance assigned to a private collection agency (CP40) |
When to get help
Only if the change points to identity theft.
Before you send anything
This is general information, not tax advice. Situations differ. Check with your tax advisor before you send anything. Nothing on this page creates a client relationship.