This volume compiles official rulings and decisions from the U.S. Internal Revenue Service for the first half of 1964, serving as a primary reference for tax law interpretation and application during that period. It details the IRS's official positions on various tax matters, providing the legal and administrative framework for tax compliance and enforcement. The content is derived directly from IRS publications and administrative pronouncements.

As a government publication, the Internal Revenue Cumulative Bulletin 1964-1(1) is regarded as an authoritative source for historical tax law. Its value lies in its direct presentation of official IRS guidance, making it an indispensable resource for legal and tax research concerning the specified period. The content is factual and regulatory, intended for professional use rather than general readership.