To request a 147c letter from the IRS, get in touch with the IRS, Business and Specialty Tax line by dialing 1-800-829-4933. Their timings are 7:00 AM to 7:00 PM from Monday to Friday (Alaska and Hawaii follow Pacific Time).
A list of questions would be asked because of security purposes. After everything is done and dusted, the IRS will mail the 147c letter.
Don’t start your search by dialing the IRS directly. Look at places like;