On approval of your EIN application, the IRS mails you a confirmation letter within eight (8) to ten (10) weeks of assigning you an EIN. This confirmation letter is known as Form CP 575 and is mailed to the address mentioned in your Form SS-4 application.

If you happen to lose or misplace your original EIN confirmation letter, which is typically a tax ID certificate, you can get an EIN verification letter only from the IRS. This verification letter serves the purpose of the original confirmation letter you received from the IRS. Thus, if you lose your EIN confirmation letter, you may need to obtain a verification letter to open a bank account or to confirm your EIN to your vendors.