The Canada Revenue Agency has uncovered at least $33 million in undeclared income from Canadian offshore accounts at the Swiss units of HSBC Private Bank and UBS, reports CBC News.

The Canadian press were told that 19 account-holders at HSBC Private Bank in Geneva have come forward since the information leak. So far investigations have revealed $1 million in unreported income as of 3 October, according to the news site.

Currently, the Canadian tax authorities are examining information on 1,800 Canadian HSBC account holders, states the news site. There were also 8,000 accounts, out of a list of 80,000, that belonged to French citizens.

Meanwhile, information that was discovered last year has revealed $32 million in unreported income from 124 audited files at UBS. Authorities have not yet examined the accounts of 83 Canadians who have turned themselves in, according to the report.

Revenue minister Keith Ashfield said his department expects to double the number of voluntary disclosures on offshore funds this year.

"We're being very proactive on the file and things are happening," said Ashfield.

The news harks back to 2009, when the revenue agency found more than $1 billion in federal taxes owed by Canadians hiding assets abroad. Another $138 million was extracted from 3,000 Canadians who came forward of their own accord.