"Traders are scared. People are worried," he said on the GST, to be rolled out at a mega midnight event in Parliament today.
Sisodia, who also holds the finance portfolio, described the GST as a "great idea", but slammed the Centre over the way it was being implemented.
Speaking at the India Today Midnight Conclave-Tryst with Tax, he said that the central government should have made better preparations for implementing the unified tax measure.
The Aam Aadmi Party (AAP) leader said that he did not find any benefit for the people in the GST.
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"When you talk about big tax (reform) it would be such that it benefits people or traders. I do not see the benefit for people or traders. Traders are scared. People are worried," Sisodia said.
Sisodia also expressed displeasure over the slapping of tax on domestic items such as pulses, slippers and clothes.
If there is lower tax rate, people will start paying taxes happily and there will be a shrink in the grey market, only then it will be an occasion to celebrate the implementation of GST, he said.
"In the entire taxation process, it is only the governments which are going to gain, not the aam aadmi (common man). It is unfortunate that real estate was kept outside the GST ambit," Sisodia added.