Liam Lawlor may have spend Christmas in Mountjoy jail.
The Dublin West TD has lost his Supreme Court appeal against the imposition of a seven-day jail term.
The Supreme Court judges ruled that Mr Lawlor had failed to comply with relevant orders of the Flood Tribunal and the High Court which obliged him to provide documents to the tribunal.
The date on which Mr Lawlor must return to prison will be decided at 2pm today.