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Income Taxes
9 Months Ended
Sep. 30, 2021
Income Tax Disclosure [Abstract]  
Income Taxes

Note 10:  Income Taxes

Management estimates the annual effective income tax rate quarterly, based on current annual forecasted results. Items unrelated to current year ordinary income are recognized entirely in the period identified as a discrete item of tax. The quarterly income tax provision includes tax on ordinary income provided at the most recent estimated annual effective tax rate (“ETR”), increased or decreased for the tax effect of discrete items.

For the nine months ended September 30, 2021 and 2020, our estimated annual effective tax rates applied to ordinary income were 136.9% and 23.7%, respectively. The difference between the federal statutory rate of 21.0% and the projected annual ETR of 136.9% for 2021 is primarily due to the non-taxable gain on extinguishment of debt recorded based on forgiveness of the PPP loan, as well as research and development credits.

Discrete items during the nine months ended September 30, 2021 and 2020 were not significant and were primarily related to expense recorded upon the expiration of stock options, and our ETR for each period was 131.2% and 22.4%, respectively.