CP148 and CP6042 Entity Notice Guide (2025-2026)
IRS information-change flow
How address, responsible-party, and entity fact changes are documented for IRS records.
Identify what changed
Responsible party, mailing address, business location, or ownership facts.
Choose the update form
Use the IRS form or letter process that matches the change.
Keep proof of submission
Save fax/mail confirmations and IRS responses.
Update future filings
Carry the changed facts into the next filing package.
Key Takeaways
- CP148 confirms an address change on the IRS business record.
- CP6042 is an entity-information verification notice tied to Form SS-4 data.
- CP148 should still be reviewed to confirm the address is correct.
- CP6042 carries a response deadline and can delay refunds or return processing if ignored.
CP148 and CP6042 are not random nuisance letters
The IRS CP148B page says CP148 notices are sent because the IRS changed the business mailing address after receiving an employment tax return or Form 8822-B with a different address than the one on file. The CP6042 page says that notice is issued because the IRS needs more information about a business, estate, or trust entity to verify information reported on Form SS-4.
That means both notices are about control of the entity's official record. They should be read as identity and correspondence notices, not as generic mail noise.
CP148 is a confirmation notice, but it still needs review
The CP148B page says that if the address change is correct, no action is required. If incorrect, the taxpayer should return the notice with a completed Form 8822-B. So even though it may look informational, the notice still functions as a checkpoint against bad address data.
This matters especially when a payroll provider, formation agent, or former advisor may have triggered the address change.
CP6042 is more urgent because it can delay processing and refunds
The CP6042 page says the recipient should respond within 30 days and warns that failure to respond or update entity information will delay return processing, refunds, or the application of overpayments to next year's estimated tax. It also says the IRS document upload tool is the fastest way to reply.
That makes CP6042 a real operational deadline. A business that ignores it can stall its own filings even if the underlying tax position is fine.
Frequently Asked Questions
Why does the IRS send CP148B to the old address?
The CP148B page says the IRS sends CP148 notices to both the former and new addresses to confirm the address change.
How long do I have to answer a CP6042 notice?
The CP6042 page says the recipient should provide the requested information within 30 days from the date of the notice.
Can a CP6042 issue affect refunds or estimated-tax credits?
Yes. The IRS CP6042 page says failure to respond or update entity information can delay return processing, refunds, or application of overpayments to next year's estimated tax.
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