This Branch specifically handles the conduct of studies on: individual and corporate income taxation; transfer taxes; and other direct taxes. As such, it prepares estimates of the impact of tax measures on government revenue and on the tax burden of corporate and individual income taxpayers, as the case may be. Generally, it liaises with government agencies especially the Department of Finance (DOF), particularly with the Bureau of Internal Revenue (BIR) and the National Tax Research Center (NTRC) as well as with the Land Transportation Office (LTO), among others, and the private sector in the formulation and evaluation of pertinent tax proposals, and thereby prepares position papers, briefers and/or draft bills/amendments on subject tax matters.

This Branch specifically focuses on indirect taxes such as the value-added, excise, documentary stamp and other percentage taxes. Generally, it liaises with government agencies especially the Department of Finance (DOF), particularly with the Bureau of Internal Revenue (BIR), the Bureau of Customs (BoC), the National Tax Research Center (NTRC), and the private sector in the formulation and evaluation of pertinent indirect tax proposals, and thereby prepares studies, briefers, fiscal estimates and statistics as well as draft bills on indirect taxation.

This Branch specifically studies the legal implications of proposals as well as deal with tariff-related matters. As such, it prepares reports and proposals on tariff-related schemes and issues under international trade agreements, e.g., the World Trade Organization (WTO), the ASEAN Free Trade Area (AFTA), Kyoto Protocol, United Nations Conventions, etc. It also assists in the conduct of investigations/inquires, in aid of legislation, on tax and customs matters as well as assesses and helps formulate proposals for reforms in tax and customs administration. Generally, it liaises with government agencies especially the Department of Finance (DOF), particularly with the Bureau of Internal Revenue (BIR), the Bureau of Customs (BoC), and the private sector in the formulation and evaluation of pertinent tax proposals concerning legal and tariff matters, and thereby prepares position papers, briefers, fiscal statistics and/or draft bills on the stated subject tax matter.

This Branch is specifically concerned with the policy and administrative aspects of taxation. It conducts research and assesses the effects of proposed tax and other fiscal incentives for investment, as well as tax concessions for welfare, health, environmental and cultural reasons. It also studies and helps formulate proposals for reforms in tax policy and administration to enhance revenue generation. It likewise provides information on tax systems of other countries and statistics on tax and in the availment of fiscal incentives granted under different special laws. Generally, it liaises with government agencies especially the Department of Finance (DOF), particularly with the Bureau of Internal Revenue (BIR), the Bureau of Customs (BoC) and the National Tax Research Center (NTRC) as well as with the Board of Investments (BOI), and the private sector in the formulation and evaluation of pertinent tax reform proposals, and thereby prepares position papers, briefers, fiscal statistics and/or draft bills on the subject.

Assessment and Monitoring Service assesses and monitors the investigation undertaken by the Blue Ribbon Committee.

Investigation Service conducts preliminary fact-finding and/or investigation and research on matters pending before the Committee.

Operations Service provides support to the data processing requirements of all Senate offices as well as technical advice to users on computer related matters. It ensures efficient and effective operations of existing application systems, hardware and software and conduct periodic assessment for possible improvements. It also conducts evaluation of I.T. products and services that meets the defined requirement specifications. It also provides other I.T. technical assistance to different Senate offices as needed.

Systems Service provides services such as system analysis, planning, design, development, integration and documentation. It defines and recommends requirement specifications, which shall serve as basis for evaluating I.T. solutions for possible implementation. It provides standards and procedures necessary to create proper framework for a responsive I.T. environment in the Senate.

It appraises operations and programs of the Senate to determine whether results are consistent with established objectives and goals and are being carried out as planned. It conducts audit activities to ensure that systems comply with government policies, plans, procedures, laws and regulations.