Labour's income for 2012 '£33m'
Labour's income in 2012 was around £2.75 million more than those of the Conservatives and Liberal Democrats combined, according to party accounts.
Ed Miliband's party had a total income of just over £33 million and spent around £30.2 million, compared to an income of £24.2 million and expenditure of £23.3 million for David Cameron's Tories.
Meanwhile, Nick Clegg's Liberal Democrats took in just over £6 million and spent more than £6.4 million
The accounts, released by the Electoral Commission, also showed a steep decline in membership for the Liberal Democrats, down from 65,038 in 2010 to 48,934 in 2011 and 42,501 last year.
Labour's membership also dropped, from 193,961 in 2010 and 193,300 in 2011 to 187,537 last year, while the Conservatives did not provide details for numbers of members.
Labour's income was up from £31.2 million in 2011 and Conservative funds also rose from £23.7 million, while Lib Dems saw a fall from £6.2 million.
Both the Scottish National Party and the UK Independence Party bucked the trend of falling membership figures.
The SNP saw membership soar from 16,232 in 2010 to 24,732 in 2012, on the back of the party's capture of overall control in Holyrood, while Nigel Farage's Ukip has grown from 15,535 in 2010 to 20,409 last year.
Meanwhile, membership of the far-right British National Party continued to tumble, from 14,046 in 2010 to 7,651 in 2011 and just 4,872 in 2012.
The SNP had an income of £2.3 million in 2012, Ukip £1.2 million and the BNP £462,450.