Central Board of Excise and Customs (CBEC) Chairperson Vanaja Sarna also said the department is keeping track of revenue trends post the GST rollout from July 1, but actual positions will be known after returns are filed in September.
The GST Council, chaired by Finance Minister Arun Jaitley and comprising state counterparts, will meet on August 5 to review implementation of the new tax regime.
Asked if concerns raised by the textile sector will be taken up, she said "possibly".
Certain textile traders have been protesting against 5 per cent GST rate on fabric. They want the tax rate to be zero. Surat-based traders who have been protesting, however, withdrew the strike earlier this week.
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"Whatever issues have been raised... Will be taken up (by the Council). When you roll out something as mammoth as GST, I would say you will always find problems or issues probably coming in till six months or a year," Sarna said.
The goods and services tax (GST), rolled out from July 1, is a uniform tax structure that replaces 17 different levies, including excise, service tax and VAT.