A CP-575 form is an official notice from the IRS confirming that your business has been assigned an Employer Identification Number (EIN).

Here’s what you should know:

1. What is a CP-575?

It’s the IRS’ “EIN Assignment Notice”.

Sent after you apply for an EIN (via SS-4 application).

Confirms:

Your legal business name

Your EIN

The date the EIN was assigned

IRS contact details

It’s not a tax return — it’s proof of your EIN for banks, vendors, government contracts, and some license applications.

2. How to Find Yours

Since the IRS only mails the CP-575 once, you won’t get a duplicate. Here’s what you can do if you lost it:

a) Check Your Records

Look in your business formation packet from your accountant or registered agent.

Search old mail from the IRS — it’s usually on light-blue paper, top-right corner says “CP 575”.

b) Request an EIN Verification Letter (147C)

If you can’t find the original:

Call the IRS Business & Specialty Tax Line:

📞 1-800-829-4933 (Hours: Mon–Fri, 7 AM–7 PM local time)

Tell them you lost your CP-575 and need an EIN Verification Letter (Form 147C).

They can fax it to you immediately or mail it to your address on file.

What is a CP-575 Form & How can I find mine?