Tax Management Portfolios on the Web. Portfolios on the Web is the premier research service. As with the Portfolios in print or on CD-ROM, the Portfolios on the Web—all authored by leading practitioners— provide in-depth analysis of specific transactional issues, along with the working papers and bibliographies necessary to develop and implement detailed tax strategies. The working papers include helpful model agreements, sample plans, elections, and letters you may use in preparing your client transactions.