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Income Taxes
 9 Months Ended
Jun. 30, 2022
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
The Company's tax provision for interim periods is determined using an estimated annual effective tax rate, adjusted for discrete items in the related period.
The effective tax rate was 18.0% and 18.5% for the three and nine months ended June 30, 2022, respectively, compared to 4.9% and 16.3% for the three and nine months ended June 30, 2021, respectively. The increase in the effective tax rate for the three and nine months ended June 30, 2022 as compared to the three and nine months ended June 30, 2021 is primarily due to the discrete impact from filing the Company’s fiscal year 2020 U.S. federal income tax return during the period ended June 30, 2021.
At June 30, 2022, the Company had $69.5 million of unrecognized tax benefits that, if recognized, would affect the effective tax rate. It is anticipated that the Company’s existing liabilities for unrecognized tax benefits will change within the next twelve months due to audit settlements or the expiration of statutes of limitations. The Company does not expect these changes to be material to the consolidated financial statements. The Company recognizes interest and, if applicable, penalties for any uncertain tax positions as a component of income tax expense.
The Company and its subsidiaries are subject to U.S. federal income tax as well as the income tax of multiple state and foreign jurisdictions. The Company has concluded all U.S. federal income tax matters for fiscal years through September 30, 2017. Major jurisdictions where there are wholly owned subsidiaries of F5, Inc. which require income tax filings include the United Kingdom, Singapore, and Israel. The earliest periods open for review by local taxing authorities are fiscal years 2020 for the United Kingdom, 2017 for Singapore, and 2013 for Israel. The Company is currently under audit by various states for fiscal years 2016 through 2020, and by various foreign jurisdictions including Israel for fiscal years 2013 to 2017, Saudi Arabia for fiscal years 2015 to 2020, and India for fiscal years 2019 to 2020. Within the next four fiscal quarters, the statute of limitations will begin to close on the fiscal year 2018 federal income tax return, fiscal years 2017 and 2018 state income tax returns, and fiscal years 2015 to 2020 foreign income tax returns.