Unfortunately, the IRS does not allow businesses to download a copy of their CP-575 letter online due to potential security concerns. The IRS generally only contacts taxpayers by mail, and this is true of EIN confirmation or verification letters as well. If you’ve misplaced the CP-575 letter the IRS originally sent you, then you can receive a confirmation of your EIN from the IRS either by contacting them directly by calling 800-829-4933, or by requesting a 174C EIN verification letter online through the IRS website.