The uniform indirect tax is expected to be rolled out from April next year.
Adhia, however, said the final decision on this will be taken by the just-constituted GST Council comprising the Union finance minister and state finance ministers.
"Instead of a single GST rate, there are multiple GST rates in some European countries. We too may have to begin with multiple rates and this is required to protect the poor and the middle class," Adhia reasoned, adding that a revenue neutral rate (RNR) will not be possible initially.
He expressed optimism that the proposed tax regime will be effective next fiscal year and the GST software will be ready for testing by January 1.
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"The IT network being created for the Centre and the states is being monitored, and by January 1, the GST software will be ready for testing wherein we will do live testing of return filings, and by April 1, we will complete the entire process of rolling out GST," Adhia asserted.
Adhia also said the exemption limit for GST is being raised to Rs 25 lakh, from Rs 10 lakh as proposed earlier, and most states are on board.