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Income Taxes
 3 Months Ended
Dec. 31, 2023
Income Tax Disclosure [Abstract]  
Income Taxes INCOME TAXES
In calculating the provision for income taxes, the Company uses an estimate of the annual effective tax rate based upon the facts and circumstances known at each interim period. On a quarterly basis, the actual effective tax rate is adjusted, as appropriate, based upon changed facts and circumstances, if any, as compared to those forecasted at the beginning of the fiscal year and each interim period thereafter.

The statutory tax rate in Ireland is being used as a comparison since the Company is domiciled in Ireland.

For the three months ended December 31, 2023, the Company's effective tax rate was (0.2%) and was lower than the statutory tax rate of 12.5% primarily due to Swiss tax reform and the benefits of continuing global tax planning, partially offset by the establishment of a deferred tax liability on the outside basis difference of the Company's investment in certain consolidated subsidiaries and tax rate differentials.

For the three months ended December 31, 2022, the Company's effective tax rate was 8.2% and was lower than the statutory tax rate of 12.5% primarily due to impairment and restructuring charges and the benefits of continuing global tax planning initiatives, partially offset by tax rate differentials.

Valuation Allowance

The Company reviews the realizability of its deferred tax assets on a quarterly basis, or whenever events or changes in circumstances indicate that a review is required. In determining the requirement for a valuation allowance, the historical and projected financial results of the legal entity or consolidated group recording the net deferred tax asset are considered, along with any other positive or negative evidence. Since future financial results may differ from previous estimates, periodic adjustments to the Company’s valuation allowances may be necessary.

Uncertain Tax Positions

At September 30, 2023, the Company had gross tax-effected unrecognized tax benefits of $2.2 billion, of which $1.6 billion, if recognized, would impact the effective tax rate. Accrued interest, net at September 30, 2023 was approximately $335 million (net of tax benefit). Interest accrued during the three months ended December 31, 2023 and 2022 was approximately $31 million (net of tax benefit) and approximately $26 million (net of tax benefit), respectively. The Company recognizes interest and penalties related to unrecognized tax benefits as a component of income tax expense.
In the U.S., fiscal years 2017 through 2018 are currently under appeal with the Internal Revenue Service (“IRS”) for certain legal entities. In addition, fiscal years 2016 through 2019 are also under exam by the IRS in relation to a separate consolidated filing group. Additionally, the Company is currently under exam in the following major non-U.S. jurisdictions:
Tax JurisdictionTax Years Covered
Belgium
2015 - 2022
Germany
2007 - 2021
Luxembourg
2017 - 2018
Mexico
2015 - 2019
United Kingdom
2014 - 2015; 2018; 2020 - 2021

It is reasonably possible that tax examinations and/or tax litigation will conclude within the next twelve months, which could have a material impact on tax expense. Based upon the circumstances surrounding these examinations, the impact is not currently quantifiable.

Other Tax Matters

The Company recorded restructuring and impairment costs of $39 million, which generated a $7 million tax benefit, during the three months ended December 31, 2023 and $345 million, which generated a $52 million tax benefit, during the three months ended December 31, 2022.

Tax expenses and benefits for the above transactions reflect the Company’s current tax positions in the impacted jurisdictions. Refer to Note 17, “Restructuring and Related Costs,” of the notes to the consolidated financial statements for additional information.

Impacts of Tax Legislation

On September 11, 2023, the Schaffhausen parliament approved a partial revision of the cantonal act on direct taxation: Immediate Minimum Taxation Measure (“IMTM”). On November 19, 2023, IMTM was approved in a public referendum in the canton of Schaffhausen, was published in the cantonal official gazette on December 8, 2023, and is effective starting January 1, 2024. The IMTM increased Switzerland's combined statutory income tax rate to approximately 15%. As a result, in the three months ended December 31, 2023, the Company recorded a noncash discrete net tax benefit of $80 million due to the remeasurement of deferred tax assets and liabilities related to Switzerland and the canton of Schaffhausen.

On August 16, 2022, the U.S. enacted the Inflation Reduction Act (“IRA”) which, among other things, creates a new book minimum tax of at least 15% of consolidated GAAP pre-tax income for corporations with average book income in excess of $1 billion. The book minimum tax is first applicable in fiscal year 2024, however, this provision does not have a material impact on the Company's effective tax rate.
During the three months ended December 31, 2023 and 2022, tax legislation was adopted in various other jurisdictions. These law changes did not have a material impact on the Company's consolidated financial statements.