Senators are still being paid their parliamentary salary and electorate allowance even though they haven't been officially re-elected yet.
An email from parliament human resources sent to all senators on 21 July confirmed the unelected senators will "continue to receive [their] base salary and electorate allowance ... paid on 29 July 2016 as per usual practice".
If they aren't re-elected to the senate when the final results have been tallied, they'll be required to pay the money back.
"If, following the declaration of the polls, you have not been returned as a senator, it will be necessary to recover this payment as a debt to the Commonwealth and as required by the Public Governance, Accountability and Performance Act 2013."