CTV News has obtained a breakdown of the amounts that 30 senators are said to owe taxpayers for filing allegedly questionable expense claims, and who from that group has started to pay the money back.

Conservative and Liberal senators are said to owe anywhere from thousands to tens of thousands of dollars each, totaling nearly $1 million-worth of alleged inappropriate expenses. More than half are sitting senators.

Breakdown of sums that senators are alleged to owe

Here’s the full list, in order of the most-to-least alleged to be owing:

  • Rod Zimmer: $176,014 (appointed by Paul Martin, retired)
  • Marie Charette-Poulin: $131,434 (appointed by Jean Chretien, retired)
  • Rose-Marie Losier-Cool: $110,000 (appointed by Chretien, retired)
  • Sandra Lovelace Nicholas: $75,207 (appointed by Martin, sitting)
  • Pierre-Hugues Boisvenu : $61,076 (appointed by Stephen Harper, sitting)
  • Gerry St. Germain: $55,000 (appointed by Brian Mulroney, retired)
  • Nick Sibbeston: $50,102 (appointed by Chretien, sitting)
  • Don Oliver: $48,000 (appointed by Mulroney, retired)
  • Colin Kenny: $37,000 (appointed by Pierre Elliott Trudeau, sitting)
  • Terry Mercer: $29,338 (appointed by Chretien, sitting)
  • Dennis Patterson: $22,985 (appointed by Harper, sitting)
  • Janis Johnson: $22,706 (appointed by Brian Mulroney, sitting)
  • Joe Day: $19,634 (appointed by Chretien, sitting)
  • Bill Rompkey: $17,292 (appointed by Chretien, retired)
  • Lowell Murray: $16,300 (appointed by Joe Clark, retired)
  • Vivienne Poy: $15,317 (appointed by Chretien, retired)
  • Robert Peterson: $11,493 (appointed by Martin, retired)
  • James Cowan: $10,397 (appointed by Martin, sitting)
  • Elaine McCoy: $10,298 (appointed by Martin, sitting)
  • Noel Kinsella: $7,705 (appointed by Mulroney, retired)
  • Sharon Carstairs: $7,528 (appointed by Chretien, retired)
  • David Tkachuk: $7,391 (appointed by Mulroney, sitting)
  • Leo Housakos: $6,770 (appointed by Harper, sitting)
  • Pana Merchant: $5,500 (appointed by Chretien, sitting)
  • Terry Stratton; $5,466 (appointed by Mulroney, retired)
  • Don Plett: $4,493 (appointed by Harper, sitting)
  • Claude Carignan; $3,560 (appointed by Harper, sitting)
  • Jean-Guy Dagenais: $3,538 (appointed by Harper, sitting)
  • Nicole Eaton: $3,489 (appointed by Harper, sitting)
  • Nancy Greene: $2,800 (appointed by Harper, sitting)

Five senators -- Zimmer, Charette-Poulin , Losier- Cool, Lovelace Nicholas and Boisvenu -- account for the bulk of the amount alleged to be owing: $553,731.

Four of these cases are among the nine the Senate speaker has referred to the RCMP for criminal investigation. Lovelace Nicholas is among the other 21 senators whose cases will not be sent to the Mounties and, rather, be dealt with through an arbitration process.

List of senators named in audit report

Some of the senators have started to pay back the money allegedly owed. While Carignan and Eaton have paid back in full, others have repaid portions:

  • Charette-Poulin: $5,606 of $131,434 owed
  • Pana Mercant: $511 reimbursed of $5,500 owed
  • Don Plett: $2,975 reimbursed of $4,493 owed
  • Nancy Greene: $2,386 reimbursed of $2,800 owed

The recent revelations about the Senate audit have renewed calls for Senate reform or, in the case of the NDP, for it to be abolished.

“It’s undemocratic. It’s responsible to no one. How can we continue, in a free and democratic society like Canada … to tolerate this institution that is such a relic from the past?” said NDP Leader Tom Mulcair in Vancouver Sunday.

Former House of Commons Law Clerk Rob Walsh told CTV’s Question Period that the scandal has left the Upper Chamber in a legal mess.

“The Senate may need to be put into a trusteeship. I think that leadership doesn’t know how to manage its institution and we should appoint a trustee to look after the Senate for all its legal problems. It’s just that bad,” said Walsh.

The highly-anticipated audit, which cost taxpayers $21 million, will be released Tuesday. While the portion of the report dealing with the nine most troubling cases -- Boisvenu, Kenny, Oliver, St. Germain, Carstairs, Losier-Cool, Rompkey, Zimmer and Charette-Poulin -- has already been sent to the RCMP, the 64 pages dealing with the other 21 senators will not be sent to the Mounties.

The Senate appointed former Supreme Court of Canada justice Ian Binnie as a special arbitrator for senators who dispute the report’s findings. Three top senators -- Speaker Housakos, Opposition Leader Cowan and Conservative Leader Carignan -- who were all named in the report as having problematic claims, were involved in the appointment of Binnie.

With a report by CTV News Deputy Ottawa Bureau Chief Laurie Graham