The CP148A notice is the IRS confirming, in writing, that it has updated the mailing address on your business tax account. It arrives at the new address after the agency processes an employment tax return or a Form 8822-B that shows an address different from what was already on file. If you moved or filed paperwork with a new location, the notice is routine confirmation. If you did not, it may be the first sign that someone changed your account without permission.
Why the IRS Sent It
The IRS updates your business address automatically whenever it processes an employment tax return listing an address that doesn’t match its records. That includes quarterly Form 941 filings and annual Form 940 filings. Any mismatch in the address field is read as an update, and the system generates CP148A.1Internal Revenue Service. Understanding your CP148A notice
Filing Form 8822-B on its own also triggers the notice. That form exists specifically for reporting a change to your business mailing address, physical location, or responsible party. Any entity with an EIN must file Form 8822-B within 60 days of changing its responsible party, and processing usually takes four to six weeks.2Internal Revenue Service. Form 8822-B, Change of Address or Responsible Party – Business
You don’t have to deliberately request a change to receive a CP148A. A payroll return filed with a slightly different address format, a new suite number, or a corrected ZIP code can set it off. The IRS system does not separate intentional updates from incidental discrepancies.
Check the Notice and Decide Whether to Act
The notice shows your Employer Identification Number, the date it was issued, and the new mailing address the IRS now has on file. It states that future IRS correspondence for your tax account will go to that address.3Internal Revenue Service. CP148A – We changed your mailing address
Read every character of the address, including suite or unit numbers and the ZIP. Small errors cause future IRS mail to bounce or land somewhere it shouldn’t. If the address is right, file the notice with your permanent business tax records. No response is required.
If the Address Is Wrong
The IRS gives two ways to correct it. You can call the business and specialty tax line at 1-800-829-4933, Monday through Friday, 7 a.m. to 7 p.m. local time. Have the notice in front of you, and look at your most recent returns so you can point to where the discrepancy came from.4Internal Revenue Service. Telephone assistance contacts for business customers
You can also respond in writing. Return the notice with a completed Form 8822-B showing the correct address, and mail it to the address printed on the notice.1Internal Revenue Service. Understanding your CP148A notice Including a copy of the notice with your correspondence speeds the correction.3Internal Revenue Service. CP148A – We changed your mailing address
Address corrections generally take four to six weeks.5Internal Revenue Service. Topic no. 157, Change your address – how to notify the IRS Keep a log of when you called, who you spoke with, and when you mailed anything. That record is your proof if the correction doesn’t take.
If You Didn’t Authorize the Change
An address change you didn’t request is one of the earliest warning signs of business identity theft. Someone who redirects your IRS mail can intercept refund checks, file fraudulent returns under your EIN, and read account information before you know anything is wrong.
If you suspect identity theft, file Form 14039-B, the Business Identity Theft Affidavit. Sole proprietors must include two forms of identification: a government-issued photo ID and a document such as a utility bill supporting the business operation. Corporations, partnerships, LLCs, and other entities must include documents like articles of incorporation, or a signed statement on corporate letterhead confirming the filer’s authority.6Internal Revenue Service. Business Identity Theft Affidavit
You can submit Form 14039-B by attaching it to the back of the CP148A and mailing it to the address on the notice. You can fax it using the number on the notice, or, if no fax number is listed, to 855-807-5720. You can also schedule an in-person appointment at an IRS Taxpayer Assistance Center by calling 844-545-5640.6Internal Revenue Service. Business Identity Theft Affidavit
The Companion Notice at Your Old Address
The IRS also sends a companion notice, CP148B, to the previous address on file. The pairing is a fraud safeguard: if the address change was unauthorized, someone at the old location gets a warning that the account moved.7Internal Revenue Service. Understanding your CP148B notice If you’re still at the old address and a CP148B shows up unexpectedly, treat it the same way as an unauthorized CP148A and act quickly to reverse the change.
Why Your Address on File Carries Legal Weight
The IRS uses a concept called “last known address,” and it makes the accuracy of your account address more important than most business owners realize. When the IRS mails a notice to your last known address, that notice is legally effective the moment it is sent, whether or not you receive it.8Office of the Law Revision Counsel. 26 USC 6212 – Notice of Deficiency
The deadlines attached to IRS notices do not wait for delivery. If the IRS mails a statutory notice of deficiency proposing additional tax, you have 90 days to petition the Tax Court. The clock starts the day the letter goes in the mail. If it went to an outdated address and you never saw it, the 90-day window still expires and the IRS assesses the tax by default.9Taxpayer Advocate Service. Legislative Recommendations – Amend IRC 7701 to Provide a Definition of Last Known Address
The same rule governs collection notices. A taxpayer who wants a Collection Due Process hearing has 30 days from the mailing date. Miss that window because the notice went to the wrong address, and the right to a pre-collection hearing is gone. “Last known address” is not defined in the tax code, so the IRS generally only needs to check its own database to meet the requirement.9Taxpayer Advocate Service. Legislative Recommendations – Amend IRC 7701 to Provide a Definition of Last Known Address
That is why a CP148A deserves more than a glance. If the address is correct, you’re set. If it’s wrong and the notice sits unread, every future IRS letter travels to the wrong place, and the statutory clocks inside those letters keep running anyway.