In three years to date, it has a total bill of €2.6m.
There are fears the Commission of Investigation into NAMA will exceed its budget of 10 million euro.
Taoiseach Micheál Martin says it's already cost 2.6 million since it was set up three years ago.
The inquiry's looking into the sale of NAMA's Northern Ireland profolio in 2014 - and whether the state lost out on millions of euro.
Aontu leader, Meath-West TD Peadar Tóibín says the commission's been dogged by delays and rising costs:
Checkpoint In Place On Westmeath Road Ahead Of Taoiseach Arrival
Gardai Appeal For Help In Locating Missing Westmeath Teen
Over 100 Residents To Be Relocated From State Accommodation In Westmeath
Midlands Toddler Shows Off Irish Dancing Talents
Laois Man Taking Part in EU Radicalisation Prevention Programme
US Firm To Acquire Westmeath Fire Protection Company Writech
€1.3m Funding Announced To Protect Midland Archaeological Heritage Sites
Ireland’s Oldest Man Celebrates 105th Birthday
Laois Senator Urges Further Government Action On Homelessness
Midlands Towns Honoured At TidyTowns Regional Awards
Electric Picnic Announces Over 40 New Acts
Enterprise Minister Rejects “Weak Government” Claims
Midlands Senator Says Fianna Fáil 'Lost The People'
New Padel Court Set To Open In Laois This Weekend
This Is Not The Time For An Election - OPW Minister
Jozef Puska Appeal Delayed Over Fired Barristers
CROÍLÁR Music & Arts Festival returns To Midlands
Westmeath Man Dubbed ‘Freddie Krueger’ Sliced Friend’s Liver While Awaiting Sentence
Funeral For Boy With Westmeath Connections Takes Place Today
Living City Initiative Launches in Westmeath Town