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Income Taxes
6 Months Ended
Jun. 30, 2021
Income Taxes.  
Income Taxes

NOTE 8. Income Taxes

The IRS has completed its field examination of the Company’s U.S. federal income tax returns through 2018, but the years 2005 through 2017 have not closed as the Company is in the process of resolving issues identified during those examinations. In addition to the U.S. federal examination, there is also audit activity in several U.S. state and foreign jurisdictions where the Company is subject to ongoing tax examinations and governmental assessments, which could be impacted by evolving political environments in those jurisdictions. As of June 30, 2021, no taxing authority proposed significant adjustments to the Company’s tax positions for which the Company is not adequately reserved.

It is reasonably possible that the amount of unrecognized tax benefits could significantly change within the next 12 months. At this time, the Company is not able to estimate the range by which these potential events could impact 3M’s unrecognized tax benefits in the next 12 months. The total amounts of unrecognized tax benefits that, if recognized, would affect the effective tax rate as of June 30, 2021 and December 31, 2020 are $1,090 million and $1,145 million, respectively.

As of June 30, 2021 and December 31, 2020, the Company had valuation allowances of $150 million and $135 million on its deferred tax assets, respectively.

The effective tax rate for the second quarter and first six months of 2021 was 21.5 percent and 18.9 percent, respectively, largely consistent with 21.0 percent and 19.3 percent for the same periods, respectively, in prior year.