The Circular E is the primary resource for tax-related information in the United States. This publication is used for testing in most contractor-licensing exams (please note that there are typically two tests required to obtain a contractor's license, one for business and one for trade).
IRS Circular E: Employer's Tax Guide was extremely helpful. I would recommend it to anyone who is trying to learn about tax information within U.S.talia perez
This book was very simply, easy to understand and thanks to Contractor Campus I passed my exam with flying colors !