Swinney joined the SNP at the age of 15, citing his anger at the way in which Scotland had been portrayed by television commentators at the Commonwealth Games. He involved himself in the SNP Youth Wing and gradually became more active in the party, becoming firstly the SNP assistant national secretary and then the national secretary in 1986, at the age of 22. Swinney was a research officer for the Scottish Coal Project, a senior management consultant with Development Options, and a strategic planning principal with Scottish Amicable. In the SNP, he served as national secretary until 1992, then vice convenor, later senior vice-convenor 1992–1997. At the time of the 1990 leadership contest he supported Margaret Ewing in her bid to become SNP leader, but this did not stop him becoming politically close to the man who went on to win that contest, Alex Salmond.
The leadership contest in 2000, caused by Alex Salmond's decision to step down as party leader, was marked by serious argument between the Gradualist wing of the party, who in the main supported Swinney and the Fundamentalist wing, who in the main supported Alex Neil. Swinney won the contest but the media raised some doubt about his ability to lead the party following poor SNP performances in the 2001 UK General Election and the 2003 Scottish Parliamentary Election. He defeated a leadership challenge from Bill Wilson in 2003, defeating Wilson by 577 votes to 111. Though retaining its two seats at the 2004 European elections, in a smaller field of 7 the Scottish press and certain elements within the fundamentalist wing of the Party depicted the result as a disaster for the SNP putting further pressure on Swinney who resigned soon afterwards on 22 June 2004.
Finance Secretary
After the SNP emerged as the largest party following the 2007 Scottish Parliament Election, Swinney led coalition talks with the Scottish Green Party. He was later appointed Cabinet Secretary for Finance and Sustainable Growth in the Cabinet of the minority SNP government. As response to Swinney not notifying the Scottish Parliament that he had let the Scottish Variable Rate lapse due to not funding this tax mechanism, the Scottish Parliament voted to censure him and called his actions "an abuse of power". Subsequently, a freedom of information request showed that even if Swinney had funded the mechanism, problems and delays in the HM Revenue & Customs computer system made any collection of the tax impossible. The Scottish Government added, "The power has not lapsed, the HMRC simply does not have an IT system capable of delivering a ten-month state of readiness."
He joined the Scottish National Party in 1979 at the age of 15 and has held several posts within the party at local and national level, including National Secretary, Vice Convener for Publicity and Depute Leader. In 2000, Swinney was elected Leader of the SNP, becoming Leader of the Opposition in the Scottish Parliament. He stood down as SNP leader in 2004 and became Convener of the Scottish Parliament's European and External Relations Committee. Swinney was previously a Member of Parliament for Tayside North in the House of Commons of the United Kingdom, before taking the same seat in the Scottish Parliament's 1999, 2003 and 2007 elections. In 2007 he achieved the largest constituency vote for any candidate in Scotland. At the election in May 2011, he was re-elected with 18,219 votes, and a majority of 10,353. Swinney's vote was the second highest in Scotland, second only to the then First Minister, Alex Salmond MSP. Following Nicola Sturgeon taking the office of First Minister, it was announced on 21 November 2014 that Swinney would become Deputy First Minister of Scotland in a cabinet reshuffle. Born in Edinburgh, Swinney was educated at the University of Edinburgh, and prior to his election to the UK Parliament in 1997, he was employed as Strategic Planning Principal with Scottish Amicable. Swinney is married and has three children.