Income Taxes	9 Months Ended
Oct. 03, 2020
Income Tax Disclosure [Abstract]
Income Taxes	12. Income Taxes The effective tax rate for the third quarter of 2020 was 23.3% as compared to 22.8% for the third quarter of 2019. Nucor has concluded U.S. federal income tax matters for years through 2016, other than 2015. The tax years 2015 and 2017 through 2019 remain open to examination by the Internal Revenue Service. The 2015 Canadian income tax returns for Harris Steel Group Inc. and certain related affiliates are currently under examination by the Canada Revenue Agency. The tax years 2013 through 2019 remain open to examination by other major taxing jurisdictions to which Nucor is subject (primarily Canada and other state and local jurisdictions). From time to time in the ordinary course of business, Nucor is involved in tax disputes with federal, state and local taxing jurisdictions, which are, individually and in the aggregate, immaterial to Nucor. Non-current deferred tax liabilities included in deferred credits and other liabilities in the condensed consolidated balance sheets were $575.2 million at October 3, 2020 ($431.0 million at December 31, 2019).

Income Taxes

9 Months Ended

Oct. 03, 2020

12. Income Taxes

The effective tax rate for the third quarter of 2020 was 23.3% as compared to 22.8% for the third quarter of 2019.

Nucor has concluded U.S. federal income tax matters for years through 2016, other than 2015. The tax years 2015 and 2017 through 2019 remain open to examination by the Internal Revenue Service. The 2015 Canadian income tax returns for Harris Steel Group Inc. and certain related affiliates are currently under examination by the Canada Revenue Agency. The tax years 2013 through 2019 remain open to examination by other major taxing jurisdictions to which Nucor is subject (primarily Canada and other state and local jurisdictions). From time to time in the ordinary course of business, Nucor is involved in tax disputes with federal, state and local taxing jurisdictions, which are, individually and in the aggregate, immaterial to Nucor.

Non-current deferred tax liabilities included in deferred credits and other liabilities in the condensed consolidated balance sheets were $575.2 million at October 3, 2020 ($431.0 million at December 31, 2019).