A 147c letter is a verification letter from the IRS that confirms a company's Employer Identification Number (EIN) and other business details, often required for financial or business purposes. It's usually needed when a business is opening a bank account, applying for a loan, or verifying its identity with a third party. To request a 147c letter, you can call the IRS Business and Specialty Tax Line or fax a completed Form 2848 to the IRS, they will then mail the letter to the address on file. The processing time can vary, but it typically takes around 7-10 business days to receive the letter after the request is made.