He has recommended a standard GST rate of 17-19 per cent.
Subramanian said a relatively low rate reduces the chances of it being inflationary and improves compliance while a high tax rate raises chances of tax avoidance.
"If you raise tax by 1 per cent, compliance comes down by 1 per cent," he added.
While many state governments are of the view that the GST rate should be around 22 per cent to protect their revenue requirements, experts believe an ideal rate should be around 18 per cent that will bring down product prices and ensure better tax compliance.
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"At 27 per cent it is totally self-defeating...Up to 18-19 per cent there will be minimal impact on inflation and if it goes to 22 per cent there will be a few basis point increase," he said.
The Constitutional Amendment Bill passed yesterday did not have the GST rate and the GST Council, which will now work out a rate. The GST Council will have representation from both the Centre and states.
The subsequent legislations Central GST (CGST) and Integrated GST (IGST) - which are likely to come up for discussion in the Winter session of Parliament - would mention the GST rate.
"Compensation is temporary but rate structure is permanent, therefore we should not burden rate structure in order to generate revenue," he said.
The government has to take a call on how to finance the compensation, he said, adding that it could be done through GST revenue itself.
The government can either preserve expenditure target, increase fiscal targets or burden the GST rates, he added.
Asked about deadline, CEA said, April 2017 is a challenging deadline.
Further probed on rate, Subramanian said that the report presented by him recommended a range of rates that depend on policy choices.
There can be no assurance on private investment revival by any one policy measure, he added.