| AAP | Advanced Analytics Platform |
| ADB | Asian Development Bank |
| AEAT | Agencia Estatal de Administración Tributaria (Spain) |
| AI | Artificial Intelligence |
| APA | Advance Pricing Agreement |
| API | Application Programming Interface |
| ATO | Australian Taxation Office |
| BEPS | Base Erosion and Profit Shifting |
| CIAT | Inter-American Center of Tax Administrations |
| CIT | Corporate Income Tax |
| CPFB | Central Provident Fund Board (Singapore) |
| CRA | Canada Revenue Agency |
| CTPA | Centre for Tax Policy and Administration |
| DGFiP | Direction Générale des Finances Publiques (France) |
| DI | Digital Identity |
| DIV | Digital Identity Validation |
| DKK | Danish Krone |
| DTA | Danish Tax Agency |
| eRFI | electronic Requirements for Information |
| EU | European Union |
| EUR | Euro |
| ETR | Electronic Transferable Record |
| FTA | Forum on Tax Administration |
| FTE | Full Time Equivalent |
| GDP | Gross Domestic Product |
| GIS | Geographic Information System |
| GenAI | Generative Artificial Intelligence |
| HMRC | His Majesty’s Revenue and Customs (United Kingdom) |
| HNWI | High Net Wealth Individual |
| HR | Human Resources |
| ICAP | International Compliance Assurance Programme |
| ICT | Information and Communication Technology |
| IMF | International Monetary Fund |
| IOTA | Intra-European Organisation of Tax Administrations |
| IRA | Italian Revenue Agency |
| IRAS | Inland Revenue Authority of Singapore |
| ISORA | International Survey on Revenue Administration |
| ITA | Israel Tax Authority |
| IT | Information Technology |
| ITTI | Inventory of Tax Technology Initiatives |
| LLM | Large Language Model |
| LTO/P | Large Taxpayer Office/Programme |
| MAP | Mutual Agreement Procedure |
| MCC | Multichannel Communication Centre |
| MNE | Multinational Enterprise |
| M2M | Machine-to-Machine |
| NIS | New Israeli Shekel |
| NLP | Natural Language Processing |
| NOK | Norwegian Krone |
| NRA | National Revenue Administration (Poland) |
| NTA | National Tax Agency (Japan) |
| NTA | Netherlands Tax Administration |
| NTA | Norwegian Tax Administration |
| NTCA | National Tax and Customs Administration (Hungary) |
| NTS | National Tax Service (Korea) |
| OECD | Organisation for Economic Co-operation and Development |
| PAYE | Pay-As-You-Earn |
| PIT | Personal Income Tax |
| RA-FIT | Revenue Administration Fiscal Information Tool |
| RFB | Receita Federal do Brasil |
| RPA | Robotic Process Automation |
| SAT | Servicio de Administración Tributaria (Mexico) |
| SEP | Self-Employed Person |
| SFBII | Service Feedback Business Intelligence Initiative |
| SII | Servicio de Impuestos Internos (Chile) |
| SMS | Short Message Service |
| SRS | State Revenue Service (Latvia) |
| SSC | Social Security Contribution |
| SSOT | Single Source of Truth |
| STA | State Taxation Administration (People’s Republic of China) |
| STA | Swedish Tax Administration |
| STI | State Tax Inspectorate (Lithuania) |
| TAS | Tax Administration Series |
| TDM | Tax and Duty Manual |
| TFTC | Task Force on Tax Crimes and Other Crimes |
| UK | United Kingdom |
| VAT | Value Added Tax |
| VITARA | Virtual Training to Advance Revenue Administration |
Tax Administration 2025
Comparative Information on OECD and other Advanced and Emerging Economies
