SINN FÉIN spent over €118,000 on its Lisbon Treaty campaign, according to figures supplied by the party.
The bulk of its spending of €118,907 was on posters, which accounted for €66,871, or over half, of the total.
Sinn Féin is the only political party or campaigning group to date to make public its expenditure for the referendum in June.
Its total spending on media advertising was €20,000, comprising of two advertisements in national newspapers and space on a number of bus shelters across Dublin.
This relatively small spend on media advertising compares with the substantial sum spent by the prominent No campaign group, Libertas, which spent €912,753 on media advertising on newspapers, billboards and on buses, plus an undisclosed further amount on brochures and leaflets which were distributed widely.
Sinn Féin, the only parliamentary party to campaign against the treaty, says it is disclosing the figures, plus the full breakdown on spending, in the interests of openness and transparency. The latest disclosure follows its publication last week of its accounts for 2007 and makes it the only party or group to make public its spending.
Other spending included €30,000 for other printed material including newsletters, the party's "alternative guide" to the treaty and other leaflets.
A further €2,331 was spent on a leadership tour with spending of €1,543 described as miscellaneous.
Speaking about its expenditure, Sinn Féin's MEP for Dublin Mary Lou McDonald said there should be an obligation on all parties to supply such details to the Standards in Public Office Commission (SIPO) following a referendum campaign.
"There is a responsibility on all of us who campaigned and organised for and against the Lisbon Treaty to be transparent in how we financed our campaigns and how the money was spent.
"Until the Irish Government introduces such legislation, Sinn Féin is calling on all political parties and campaign groups to follow Sinn Féin's lead and publish their Lisbon Treaty referendum campaign expenditure."
Unlike election spending, there are few limits or obligations imposed on political parties and third-party groups like Libertas and the People's Movement in relation to referendum spending.
Under the current electoral Acts, there are requirements for third parties to register, open and maintain a political donations account and supply an annual bank statement to SIPO.
However, it is not possible to establish the source, or levels, of donations which were received by political parties and third-party groups for the referendum campaign.
Yesterday, Sinn Féin said its campaign was funded by the party centrally, by local organisations, a €20,000 contribution from the party's EU parliamentary group and a public appeal for donations, the largest of which was €650.
