Accounts published by the Electoral Commission show that the Progressive Unionists ran a deficit of more than £57,000 last year.
The party's finances appear to have taken a sharp down turn after the resignation of the former East Belfast MLA Dawn Purvis.
In 2009 the party received more than £100,000 in Northern Ireland assembly allowances.
That figure dropped by £65,000 in 2010.
In the financial report, the party said that financial assistance from the assembly ceased after Ms Purvis's resignation on 3 June 2010.
The PUP reported that they were relying on existing funds and had hoped to return an MLA in May's election.
Neither the PUP leader Brian Ervine, nor the former leader Dawn Purvis, who stood as an independent, were elected by voters in East Belfast.