Mr Liam Lawlor has been ordered to pay over half of his outstanding €500,000 legal bill accumulated during his protracted courts battle with the Flood Tribunal.
The High Court Taxing Master, Mr Charles Moran, ruled he must pay €300,000 pending an appeal to be heard next month.
Mr Moran ruled in April that Mr Lawlor must pay just over €500,000 in fees to the tribunal arising from five sets of proceedings in which the parties were involved.
This was a reduction of less than €50,000 in the amount originally demanded by the tribunal, which had been hotly contested by the TD's advisers.
In addition, Mr Lawlor is facing a further claim by the tribunal for €150,000 in relation to later proceedings dating from last January.
Mr Lawlor will also have to pay his own legal expenses, which are estimated at more than €500,000.
So far the former Fianna Fáil TD for Dublin West has spent a total of six weeks in prison and paid fines of €31,700 for failing to cooperate with the tribunal. He declined to run in last month’s General Election.