Westlaw and Lexis both have good coverage of both primary and secondary tax materials through the Tax Practice Area and Tax Law Practice Area respectively. However, Boston College subscribes to a number of specialized tax services focused exclusively on tax research. These services combine primary tax materials with tax related secondary sources that provide helpful tools to aid tax practitioners with research and task related to their practice, making them efficient, all-in-one sources for any tax research research issue. They include Bloomberg Tax, Checkpoint (Thomson Reuters), and the VitalLaw Tax Practice Center.
Access Bloomberg Tax by logging in to Bloomberg Law, and selecting Tax from the Practice Area pull-down menu. Bloomberg Tax contains primary tax authorities, including the Internal Revenue Code, Treasury Regulations and administrative guidance, as well as secondary materials including the Tax Management Portfolios
Access Checkpoint through the All Law Library Databases link on the Law Library's website. Checkpoint provides access to primary tax authorities and a variety of secondary materials including the US Tax Reporter, Federal Tax Coordinator, US tax treaties, a citator service and WG&L tax treatises.
Access VitalLaw's Tax Libraries through the All Law Library Databases link on the Law Library's website. VitalLaw's Tax Libraries. VitalLaw's tax coverage includes federal, international, estates, gifts & trusts and state & local tax law materials. It combines primary sources of those topics and secondary sources including the Standard Federal Tax Reporter, Federal Estate and Gift Tax Reporter and the Multistate Corporate Tax Guide.