13.

INCOME TAXES: The effective tax rate for the third quarter of 2017 was 28.2% compared to 31.6% for the third quarter of 2016. The decrease in the effective tax rate for the third quarter of 2017 as compared to the third quarter of 2016 was primarily due to a net tax benefit totaling $13.2 million related to a return to provision change in estimate and state tax credits included during the third quarter of 2017.

Nucor has concluded U.S. federal income tax matters for years through 2013. The tax years 2014 through 2016 remain open to examination by the Internal Revenue Service. The Canada Revenue Agency has substantially concluded its examination of the 2012 Canadian returns for Harris Steel Group Inc. and certain related affiliates and is now examining the 2013 Canadian returns. The tax years 2010 through 2016 remain open to examination by other major taxing jurisdictions to which Nucor is subject (primarily Canada and other state and local jurisdictions).

Non-current deferred tax assets included in other assets in the condensed consolidated balance sheets were $0.6 million at September 30, 2017 (none at December 31, 2016). Non-current deferred tax liabilities included in deferred credits and other liabilities in the condensed consolidated balance sheets were $516.0 million at September 30, 2017 ($558.6 million at December 31, 2016).