Almost 160 trips to Chinatown in Sydney's Haymarket have been made, with more than 18 million dollars in misreported transactions found.
Following audits of 11,000 companies across Australia that operate through cash only, in the last financial year, seven out of 10 had to increase the tax they were paying.
It has resulted, so far, in nearly $200 million dollars in tax and penalties.
Reporting cash as income is key to passing the ATO's inspections.
Ms Jenkins says it is crucial that business owners do their due diligence in terms of record-keeping and registrations.