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This report looks back at TIWB’s achievements from July 2022 to December 2023. Chapter 1 describes TIWB in the evolving international taxation and development context. Chapter 2 discusses TIWB programmes and operations. Chapter 3 provides information on current and future areas of TIWB technical assistance. Chapter 4 highlights results obtained over the past year. Chapter 5 describes TIWB participation at international events and the initiative’s communication efforts. Finally, Chapter 6 sets out the work plan for the year and provides an overview of the previous year’s objectives and performance.

Unlocking what drives tax morale – the intrinsic willingness to pay tax – can greatly assist governments in the design of tax policies and their administration, particularly in developing countries where compliance rates are low. This report builds on previous OECD research to identify some of the key socio-economic and institutional drivers of tax morale across developing countries, and seeks to test for evidence of the social contract by examining the impact of public services on tax morale. It also uses new data on tax certainty as an entry point to explore tax morale in businesses, where existing research is very limited. Finally, the report identifies a range of factors related to the tax system that may affect business decision making, how they vary across regions, and suggests some areas for future research. Overall, the report provides a range of suggestions for further work, and how tax morale considerations can be integrated into holistic tax compliance strategies.

The issue of trust between Multinational Enterprises (MNEs) and tax administrations is a vital part of the tax system, but relatively little studied. Building on previous OECD research on tax morale, which measures taxpayer perceptions and attitudes towards paying and evading taxes, this report presents new data on how tax administrations perceive MNE behaviour towards tax compliance. With a particular focus on the challenges facing developing countries, this report brings together this data with previous data on MNE perceptions, and the outcomes of a series of regional roundtables on tax morale held between tax administrations and MNEs. Having identified a number of challenges around trust, transparency and openness, the report sets out a range of approaches to help build trust, improve communications, and build more effective relationships between taxpayers and tax administrations.

This third edition covers the latest tax policy reforms in all OECD countries, as well as in Argentina, Indonesia and South Africa. Monitoring tax policy reforms and understanding the context in which they were undertaken is crucial to informing tax policy discussions and to supporting governments in the assessment and design of tax reforms.

This is the fourth edition of Tax Policy Reforms: OECD and Selected Partner Economies, an annual publication that provides comparative information on tax reforms across countries and tracks tax policy developments over time. The report covers the latest tax policy reforms in all OECD countries, as well as in Argentina, Indonesia and South Africa. Monitoring tax policy reforms and understanding the context in which they were undertaken are crucial to informing tax policy discussions and to supporting governments in the assessment and design of tax reforms.

This is the fifth edition of Tax Policy Reforms: OECD and Selected Partner Economies, an annual publication that provides comparative information on tax reforms across countries and tracks tax policy developments over time. The report covers the latest tax policy reforms in all OECD countries, as well as in Argentina, China, Indonesia and South Africa. In addition to providing an overview of the tax reforms adopted before the COVID-19 crisis, the report includes a Special Feature that takes stock of the tax and broader fiscal measures introduced by countries in response to the crisis from the beginning of the virus outbreak up to mid-June 2020.

The report provides an overview of the tax measures introduced during the COVID-19 crisis across almost 70 jurisdictions, including all OECD and G20 countries and 21 additional members of the OECD/G20 Inclusive Framework on Base Erosion and Profit Shifting. It examines how tax policy responses have varied across countries and evolved over the last year. It also offers some guidance as to how tax policy responses could be adapted to address the short-term challenges countries face and outlines future work that the OECD will be undertaking to help countries reassess their tax and spending policies in the longer run.

This is the seventh edition of Tax Policy Reforms: OECD and Selected Partner Economies, an annual publication that provides comparative information on tax reforms across countries and tracks tax policy developments over time. The report covers the tax policy reforms introduced or announced in 71 member jurisdictions of the OECD/G20 Inclusive Framework on Base Erosion and Profit Shifting, including all OECD countries, for the 2021 calendar year. In addition to providing an overview of tax policy reforms, and the macroeconomic and tax revenue context in which measures were introduced, the report also contains a Special Feature that examines government responses to rising energy prices and offers some policy recommendations in the event that prices remain high.

This is the eighth edition of Tax Policy Reforms: OECD and Selected Partner Economies, an annual publication that provides comparative information on tax reforms across countries and tracks tax policy developments over time. The report covers the tax policy reforms introduced or announced in 2022 in 75 member jurisdictions of the OECD/G20 Inclusive Framework on Base Erosion and Profit Shifting, including all OECD countries. The publication provides an overview of the macroeconomic environment and tax revenue context in which these tax reforms were made, highlighting how governments used tax policy to respond to elevated inflation levels, as well as to address long-run structural challenges.

This is the first edition of "Tax Policy Reforms in the OECD". This annual series of reports aims to track and compare tax policy developments over time across OECD countries. This year’s edition focuses on the tax reforms that were introduced in 2015 and identifies the most significant tax policy reforms as well as common tax policy trends across groups of countries. The Report is primarily based on responses to the OECD Tax Policy Reform Questionnaire which is sent yearly to all member countries to collect information on tax reforms and their expected revenue effects. Monitoring  tax policy reforms across the OECD and understanding the context in which they were undertaken is crucial to inform tax policy discussions but also to support member and non-member countries in their assessment and design of future tax reforms.

Although men and women are typically taxed under the same rules, their different social and economic characteristics (e.g. income levels or labour force participation) mean that the tax system can inadvertently contribute to gender inequalities in society. Understanding and improving the impact of taxes on gender equality is a key dimension that governments need to consider as part of tax design to support inclusive growth. This report provides the first cross-country overview of governments' approaches to tax policy and gender, including reforms undertaken to date and potential areas of explicit and implicit gender bias. Covering 43 countries, it also explores the extent to which governments take into account gender implications in policy development, gender considerations in tax administration and compliance, and the availability and use of gender-disaggregated data. Finally, it also discusses priorities for further work on tax policy and gender issues.

This information note has been prepared by the Forum on Tax Administration to assist revenue bodies, in respect of tax repayments, to achieve a balance between client service levels and the prevention and mitigation of fraudulent activities.

This report investigates how tax revenue from transport fuels could evolve over time as vehicles rely less on fossil fuels, with a focus on the case study of the Republic of Slovenia. Reducing the reliance on fossil fuels in the transport sector is a welcome development from the perspective of its climate and health impacts and of reduced energy dependence. However, under current settings, reduced fuel use will also lead to a loss of tax revenues, which may put stress on government budgets. Based on simulations for Slovenia, with a 2050 horizon, the report provides an in-depth assessment of the taxation of road transport and investigates how tax policy could adapt to declining fossil fuel use in the long term if the objective is to maintain revenues at current levels while taking fairness and efficiency considerations into account. It finds that gradual tax reforms, with an evolving mix of taxes, shifting from taxes on fuel to taxes on distances driven, can contribute to more sustainable tax policy over the long term.

Tax sparing provisions have now more than four decades of history in bilateral tax treaties, including treaties between OECD countries. But the world of today is quite different from that when the positions of OECD Member and non-member countries towards tax sparing were developed. These changes in the international setting have led countries to reconsider their attitude towards tax sparing and the design of such provisions. This report examines the practices of Member countries and explains why Member countries have become more reluctant to grant tax sparing in treaties. It also provides a number of suggested "best practices" on the design of tax sparing provisions in tax treaties.

This report looks back at 15 years of tax and development work at the OECD charting the evolution of the OECD’s engagement with, and inclusion of, developing countries in its tax work from 2009 to 2024. Beginning with the restructuring of the Global Forum on Transparency and Exchange of Information for Tax Purposes in 2009, through the BEPS Actions, the establishment of the Inclusive Framework on BEPS and negotiations on the Two Pillar Solution to Address the Tax Challenges of the Digitalising Economy, it shows how OECD initiatives have combined the momentum for multilateral tax co-operation with the increased focus on taxation in international development, to develop a range of tools, instruments and forums with wide participation from developing counties. Accompanying the move to multilateralism in tax matters, the OECD has also sought to increase the availability of data on taxation, for example through the Global Revenue Statistics Database, and support more integrated tax and development policy thinking, for example on the taxation of development assistance. Concurrently there has been a continuous growth in the OECD capacity building activities, now reaching over 30,000 officials in over 100 countries annually. Notable among these initiatives is the groundbreaking joint OECD/UNDP Tax Inspectors Without Borders initiative. The report features several case studies highlighting the impacts across various countries, as well as the wide range of partnerships forged by the OECD to harness taxation’s potential in advancing sustainable development.