Final answer:
The Tax Management Portfolios, which offer practical tax analysis and tools, are published by the Bureau of National Affairs (BNA), known today as Bloomberg Tax & Accounting. They are used by tax professionals to navigate complex tax issues.
Step-by-step explanation:
The Tax Management Portfolios are a comprehensive tax research service providing practical analysis, primary source materials, and compliance tools which are organized functionally. These portfolios are published by c. Bureau of National Affairs (BNA), which is now known as Bloomberg Tax & Accounting after BNA was acquired by Bloomberg. The portfolios cover a plethora of topics, including detailed tax planning, the tax implications of business transactions, and in-depth analysis of current tax issues. The Tax Management Portfolios are widely utilized by tax professionals, accountants, and attorneys for understanding and navigating the complexities of the tax code and its application to various scenarios.