The RCMP has arrested seven people as part of alleged fraud that involved some Canada Revenue Agency employees.
Charges laid include bribery of public officers, conspiracy, fraud, breach of trust by a public officer and fraud against the government.
Five of the accused allegedly received commissions on tax credits that were obtained through fraudulent means.
The Mounties said in a statement Monday that three of those five were active Canada Revenue Agency officials at the time the alleged offences took place.
The five are scheduled to appear in court in Montreal on April 7.
One of the five plus two other people have also been charged in a separate component of the investigation and will appear in court on March 19.
The investigation, known as Project Coche, began in 2008 and resulted in the arrest of 15 people, including eight former Canada Revenue Agency officials.
National Revenue Minister Kerry-Lynne Findlay said any misconduct by agency officials is "completely unacceptable."
"The CRA will continue to investigate any allegations of misconduct and continue to cooperate with the RCMP to ensure that the individuals responsible face the full force of the law," she said in a statement.