"We are surprised to find out that the total revenue collected was just Rs 310 crore in the last two months, despite 7.5 lakh composition dealers having filed returns,"he told reporters after a Group of Ministers (GoM) meeting here.
"This slump only means there is suppression of turnover by composition dealers who are evading taxes. The amount was not large enough, but it was not in good taste", Modi said.
Under the composition scheme, tax payers with a turnover of upto Rs 1.5 crore have the option of paying a minimal rate of tax and filing a simplified tax return, he said.
The average revenue shortfall of all states for August was 28.3 per cent and it slumped to 17.5 per per cent in October.
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Modi, however, said GoM was confident of plugging the loopholes and disruptions in terms of revenue slump.
Going by past experience, the GSTN platform has been able to reduce the glitches because the technology was designed in such a manner that it would be difficult to evade taxes, he said.
The number of returns filed till date was 5.25 crore and 154 crore invoices had been processed by GSTN.
"As of today, the due registration and migrated tax payers have reached a figure of one crore," he said.
As much as 93 per cent of 47 assigned functionalities of GSTN have been operationalised and the remaining would be operationalised in the coming days, he said.
The GoM also was happy with Infosys as they have kept up their word to address the glitches, he said.
On the drop in GST collections in general, Karnataka Minister Krishna Byre Gowda, a member of the GST council, said the concern was about the revenues going down.
"The idea is not to get compensation.... idea is to raise our own resources. Surprisingly, in the last two months, revenues have taken an alarming dip and that is a major concern. So we all discuss at various levels - why it is happening and how to overcome that", he said.
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