He was chair of the Irish Fiscal Advisory Council (IFAC) from 2016 to 2020.

[1] Coffey authored the Irish state's review of the Irish corporate tax code in 2016 (the Coffey Report), whose findings were implemented in 2017–2018.

[11] Coffey maintains an economics blog called Economic Incentives,[12][13] which was the first to show the source of Ireland's 2015 distorted GDP growth was Apple.

[14][15][16] Coffey has won praise amongst financial commentators for the independence of IFAC's reports, and his role of 'financial watchdog' of state finances.

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