Important Links

Professional Bodies :

The Institute of Chartered Accountants of India  (Indirect taxation Committee) http://idtc.icai.org/
The  Institute of Company Secretaries of India (GST News) http://www.icsi.edu/GSTCorner.aspx
Institute of Cost Accountants of India (GST ACT, Rules and Analysis) http://icmai.in/icmai/news/GST-Rules-Analysis.php

Government :

Central Board of Direct Taxes http://www.cbec.gov.in/
Ministry of Finance http://finmin.nic.in/
Department of Revenue http://dor.gov.in/
Goods and Services Tax https://www.gst.gov.in
 
Goods and Services Tax Network http://www.gstn.org/
GST Council http://www.gstcouncil.gov.in/
Service Tax https://www.aces.gov.in
New Registration https://reg.gst.gov.in/registration/
Track Registration Status https://services.gst.gov.in/services/arnstatus

State Government Web Sites :

Andaman and Nicobar Islands http://www.and.nic.in/
Assam https://www.tax.assam.gov.in/
Chhattisgarh http://www.comtax.cg.nic.in/
Delhi http://dvat.gov.in/website/home.html
Haryana https://haryanatax.gov.in
Jharkhand http://jharkhandcomtax.gov.in/home
Lakshadweep http://lakshadweep.nic.in/
Manipur http://www.manipurvat.gov.in/
Nagaland https://www.nagaland.gov.in//portal
Punjab https://www.pextax.com
Tamil Nadu https://ctd.tn.gov.in/
Uttarakhand http://comtax.uk.gov.in/
Andhra Pradesh https://www.apct.gov.in/apportal/
Bihar https://www.biharcommercialtax.gov.in/bweb/
Dadra and Nagar Haveli https://www.dnh.gov.in/portal/portal/
Goa http://www.goacomtax.gov.in/
Himachal Pradesh https://hptax.gov.in/HPPortal/
Karnataka http://www.ctax.kar.nic.in/
Madhya Pradesh https://mptax.mp.gov.in/mpvatweb/
Meghalaya http://megvat.gov.in/
Odisha https://odishatax.gov.in/
Rajasthan http://rajtax.gov.in/vatweb/
Telangana https://www.tgct.gov.in/tgportal/
Uttar Pradesh http://comtax.up.nic.in/
Arunachal Pradesh http://www.arunachalpradesh.nic.in/
Chandigarh http://www.chandigarh.gov.in/
Daman and Diu http://www.daman.nic.in/
Gujarat https://www.commercialtax.gujarat.gov.in/vatwebsite/home/home.jsp
Jammu and Kashmir https://jkcomtax.gov.in/JKPortal/
Kerala http://keralataxes.gov.in/
Maharashtra http://www.mahavat.gov.in/Mahavat/index.jsp
Mizoram http://www.mizoram.nic.in/
Puduchery http://gst.puducherry.gov.in/
Sikkim http://www.sikkimtax.gov.in/
Tripura http://taxes.tripura.gov.in/
West Bengal http://www.wbcomtax.nic.in/