"There should be only one slab of tax, that is 18 per cent, and roll-out of GST should be delayed till October 1 (instead of July 1) for the time being," the Congress general secretary said.
He was speaking to reporters in Bhopal after taking part in Congress' 'Satyagraha' to protest the killing of five farmers in police firing in Mandsaur district.
"GST is successful wherever there is a single slab of tax rate. Here it has eight slabs and it will lead to problems," Singh said.
Narendra Modi (when he was Gujarat chief minister) opposed GST, but now he wants to take credit for it, Singh said.
"It is (proposed GST structure) is a decision taken in a hurried manner. The Congress will support the traders who today observed a bandh in protest against GST," he said.
Meanwhile, Singh has written a letter to the Prime Minister, reminding him of BJP's poll promise on MSP.
"BJP manifesto in 2014 Lok Sabha election had promised that it would ensure that farmers will get MSP equal to one-and-a-half times the cost of farm produce as per the Swaminathan Commission report," the letter said.
"Farmers could not get adequate price for produce during the Kharif season in 2016 and Rabi season in 2017 due to demonetisation, because more than 85 per cent of traders paid them in cash (which the note-ban made difficult)," it said.
Change in import duty on farm produce also harmed the farmers' interests, it said, adding that in December 2016, the centre reduced the import duty to zero per cent from 10 per cent, and in March 2017 it was again increased to 10 per cent.
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