Charged Mount Gambier MP Troy Bell is still receiving financial support from a senior Liberal, despite declaring his intention to run against his former party as an independent candidate at the March election.

Neighbouring MP and former deputy Liberal leader Mitch Williams has transferred $8,000 of unused allowance to Mr Bell, who intends to fight for re-election despite facing more than 20 corruption charges which relate to the alleged misuse of taxpayer funds.

Mr Bell was forced to resign from the Liberal Party in August after he was charged as a result of a referral to the state's Independent Commissioner Against Corruption Bruce Lander.

It is alleged the former teacher dishonestly dealt with more than $2 million of public money while running an independent learning centre in Mount Gambier prior to the last election.

The Mount Gambier MP has continued to serve in Parliament, and has strenuously denied all charges against him.

Member for MacKillop Mitch Williams transferred $8000 to Mr Bell. ( ABC South East SA: Stuart Stansfield )

On January 3 Mr Williams, who will retire at the election, wrote to Treasurer Tom Koutsantonis requesting to transfer $8,000 of his unused Global Allowance to Mr Bell. The request was granted.

The Global Allowance, worth more than $50,000 a year, is a largely discretionary entitlement for MPs to use to service their electorates. Members are allowed to transfer unspent funds to other electorates.

A spokesman for Liberal leader Steven Marshall said he was unaware of Mr Williams' decision.

Mr Williams said he had a long-term commitment to transfer funds from his Global Allowance to Mr Bell while the Mount Gambier MP was still a member of the Liberal Party.

"Troy had made decisions based on that commitment," Mr Williams said.

"I've always been a man of my word. I felt duty bound to fulfil that commitment."

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Mr Williams denied his decision to hand money to Mr Bell could be seen as a slight on the Liberals' current pre-selected candidate for Mount Gambier, real estate agent and former weatherman Craig Marsh.

The Treasurer said he was shocked by the request, and a transfer across party lines was unprecedented.

"Quite frankly I think Mr Marshall needs to explain why one of his MPs is funnelling $8,000 to a man who's facing serious allegations from the ICAC," Mr Koutsanonis said.

Marshall won't rule out Bell deal

SA Liberal leader Steven Marshall (right) would not be drawn on a potential deal. ( ABC South East SA: Kate Hill )

When asked at a press conference this morning, Mr Marshall repeatedly refused to rule out dealing with the Mount Gambier MP in a bid to form a minority government, should Mr Bell hold onto his seat in March.

That is despite the Liberal leader's repeated statements he would not negotiate with Nick Xenophon's SA Best Party.

"Our focus is not on doing deals with independents, it is on forming a majority government," Mr Marshall said.

"I'm not going to talk about hypotheticals today."

Mr Bell's next listed court date is February 19, two days after writs are issued for the March 17 election.