Income Taxes

3 Months Ended

Dec. 31, 2023

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

Effective Tax Rate

The effective income tax rate was 7.3% and 17.2% during the quarters ended December 31, 2023 and 2022, respectively. The provision for income taxes during interim quarterly reporting periods is based on our estimates of the effective tax rates for the full fiscal year. The effective tax rate in any quarter can also be affected positively or negatively by adjustments that are required to be reported in the specific quarter of resolution.

A provision enacted as part of the 2022 Inflation Reduction Act imposes a 15% corporate minimum tax. The provision is effective for tax years beginning after December 31, 2022, which means that it was effective for our fiscal year beginning October 1, 2023. We do not expect any impact to our fiscal 2024 effective tax rate from the corporate minimum tax provision.

The total unrecognized tax benefit for uncertain tax positions was estimated to be $14.8 million and $13.8 million at December 31, 2023 and September 30, 2023, respectively. We recognize interest expense related to unrecognized tax benefits and penalties as part of the provision for income taxes in our condensed consolidated statements of income and comprehensive income. We accrued interest of $1.2 million and $0.9 million related to unrecognized tax benefits as of December 31, 2023 and September 30, 2023, respectively.