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Income Taxes | 9 Months Ended
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Jun. 30, 2026
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 8.0% and 16.0% for the three and nine months ended June 30, 2026, respectively, compared to 10.8% and 15.4% for the three and nine months ended June 30, 2025, respectively. The decrease in the effective tax rate for the three months ended June 30, 2026, as compared to the three months ended June 30, 2025, is primarily due to a change in unrecognized tax benefits. The increase in the effective tax rate for the nine months ended June 30, 2026, as compared to the nine months ended June 30, 2025, is primarily due to the tax impact of non-recurring benefits recorded in the prior year related to foreign operations and stock-based compensation, partially offset by a change in unrecognized tax benefits in the current year. At June 30, 2026, the Company had $72.7 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. During the third quarter of fiscal year 2026, the Internal Revenue Service completed its examination of the Company’s fiscal year 2019 U.S. federal income tax return with no adjustments. The Company has concluded all U.S. federal income tax matters for fiscal years through September 30, 2022. Major jurisdictions where there are wholly owned subsidiaries of F5, Inc. which require income tax filings include the United Kingdom, Singapore, Israel, and India. The earliest periods open for review by local taxing authorities are fiscal years 2024 for the United Kingdom, 2024 for Singapore, 2020 for Israel, and 2019 for India. The Company is currently under audit by various states for fiscal years 2018 through 2024, and by various foreign jurisdictions including India for fiscal years 2019 to 2025, Israel for fiscal years 2020 to 2024, Saudi Arabia for fiscal years 2015 to 2021, and Singapore for fiscal year 2024.

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