The documents filed by the RCMP National Division in Ottawa allege that Wallin "defrauded the Senate" between Jan. 2, 2009 and Sept. 30, 2012 in an amount exceeding $5,000 "by deceit, falsehood, or other fraudulent means."
The alleges are contained in the information to obtain a production order filed with the court to aid the RCMP's investigation.
The allegations have not been proven in court.
Senators Mike Duffy and Patrick Brazeau are also under investigation.
More to come.