1. Published by Income Tax Department
2. Published by Central Board of Excise & Customs  – Customs Circulars
3. Published by Central Board of Customs – Central Excise Circulars
4. Published by Central Board of Customs – GST Circulars
5. Published by Govt. of Tamilnadu-Important Orders / Circulars
6. Ministry of Micro, Small & Medium Enterprises
7. Department of Commerce