Income Taxes	3 Months Ended
Apr. 04, 2020
Income Tax Disclosure [Abstract]
Income Taxes	12. Income Taxes The effective tax rate for the first quarter of 2020 was 62.8% as compared to 23.0% for the first quarter of 2019. The increase in the effective tax rate between 2019 and 2020 is primarily due to the $250.0 million financial statement impairment of our equity method investment in Duferdofin Nucor the first quarter of 2020. The impairment had no corresponding impact to the provision for income taxes. Nucor has concluded U.S. federal income tax matters for years through 2014. The tax years 2015 through 2018 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 2018 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 liabilities included in deferred credits and other liabilities in the condensed consolidated balance sheets were $446.5 million at April 4, 2020 ($431.0 million at December 31, 2019).

Income Taxes

3 Months Ended

Apr. 04, 2020

12. Income Taxes

The effective tax rate for the first quarter of 2020 was 62.8% as compared to 23.0% for the first quarter of 2019. The increase in the effective tax rate between 2019 and 2020 is primarily due to the $250.0 million financial statement impairment of our equity method investment in Duferdofin Nucor the first quarter of 2020. The impairment had no corresponding impact to the provision for income taxes.

Nucor has concluded U.S. federal income tax matters for years through 2014. The tax years 2015 through 2018 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 2018 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 liabilities included in deferred credits and other liabilities in the condensed consolidated balance sheets were $446.5 million at April 4, 2020 ($431.0 million at December 31, 2019).