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Sinn Fein raised and spent almost three times that of its closest competitors in Northern Ireland last year, the Electoral Commission said.
The republican party used £1.2 million on fighting the Westminster elections and supporting representatives at Assembly and council level. It still made a small profit and its financial success was largely due to contributions from its elected members.
The Democratic Unionist Party raised £268,456, with the SDLP at £346,946. Both parties had a deficit. The Ulster Unionist Party raised £440,949 and spent less.
Parties are having to raise money amid a tough financial climate. Despite this, Sinn Fein's income rose in 2010. Its greatest expense was elections. The party received just over £1.2 million and spent slightly less. It is almost £77,000 in the black.
Sinn Fein received grants worth £167,587 for its Assembly members and £95,052 in allowances for Westminster representatives. The party has come under pressure from some MPs for claiming parliamentary expenses but not sitting at Westminster.
Last year, the DUP spent £335,678, leaving it with an excess expenditure of £67,222.
The nationalist SDLP raised £346,946 and spent £413,238. Question marks have been raised by political rivals in recent days about the future of party leader Margaret Ritchie. The SDLP has a deficit of £66,292.
Its donations fell to £36,922 in 2010 from £83,672 the year before.
The Ulster Unionist Party raised £440,949 and spent £398,295.
The Alliance Party finished the year with a £11,082 surplus, explained by a one-off transfer of Lagan Properties' shares into the party's ownership and £7,000 earned from a 40th anniversary dinner at the Stormont Hotel.
