Quarterly report pursuant to Section 13 or 15(d)

Income Taxes

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Income Taxes
9 Months Ended
Sep. 30, 2021
Income Tax Disclosure [Abstract]  
Income Taxes INCOME TAXES
We recorded a (benefit) provision for income taxes of $(1,192) and $3,100 for the three months ended September 30, 2021 and 2020, respectively. The estimated effective annualized tax rate impacted by the period discrete items is a benefit of 6.2% for the three months ended September 30, 2021, compared to a provision of 14.9% of estimated effective annualized tax rate for the three months ended September 30, 2020.
We recorded a (benefit) provision for income taxes of $(883) and $597 for the nine months ended September 30, 2021 and 2020, respectively. The estimated effective annualized tax rate impacted by the period discrete items is a benefit of 1.8% for the nine months ended September 30, 2021, compared to a provision of 1.8% of estimated effective annualized tax rate for the nine months ended September 30, 2020.
The principal reasons for the difference between the statutory rate and the estimated annual effective rate for 2021 were the effects of investment tax credits which we are entitled from solar plants placed into service or are forecasted to be placed into service during 2021, the tax deductions related to the Section 179D deduction, the deduction of compensation expense associated with certain employee stock options, and tax basis adjustments on certain partnership flip transactions.
The principal reason for the difference between the statutory rate and the estimated annual effective rate for 2020 were the effects of investment tax credits to which we are entitled from solar plants which were placed into service during 2020, tax deductions related to the Section 179D deduction, tax basis adjustments on certain partnership flip transactions, and tax rate benefits associated with the net operating loss carryback made possible by the passing of the COVID-19 CARES Act on March 27, 2020.
Under GAAP accounting rules deferred taxes are shown on a net basis in the condensed consolidated financial statements based on taxing jurisdiction. Under the guidance, we have recorded long term deferred tax assets and deferred tax liabilities based on the underlying jurisdiction in the accompanying condensed consolidated balance sheets.
The following table sets forth the total amounts of gross unrecognized tax benefits:
Gross Unrecognized
Tax Benefits
Balance, December 31, 2020 $ 600 
Additions for prior year tax positions 200 
Balance, September 30, 2021 $ 800 
The amount of unrecognized tax benefits that, if recognized, would favorably affect the effective income tax rate in any future periods was $400 at September 30, 2021 and $190 at December 31, 2020 (net of the federal benefit on state amounts).