"Demonetisation was organised loot and legalised plunder," he said during his visit to poll-bound Gujarat.
Hitting out at the government over the rollout of the Goods and Services Tax, Singh said compliance requirements under GST had become a nightmare for small businesses.
He also criticised the Centre's ambitious Ahmedabad- Mumbai bullet train project and dubbed it an exercise in vanity.
Singh's visit comes a day before Congress vice president Rahul Gandhi is likely to tour Surat on the anniversary of the government's announcement of the demonetisation exercise.
Opposition parties are observing 'black day' tomorrow.
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