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Income Taxes
6 Months Ended
Mar. 31, 2026
Income Taxes  
Income Taxes

13.Income Taxes

The Company’s provision for income taxes is based on the estimated annual effective tax rate, plus discrete items.

Income tax expense (benefit) was $1.5 million and $(2.0) million for the three months ended March 31, 2026 and 2025, respectively. The effective tax rate for the three months ended March 31, 2026 and 2025 was (5.6)% and 4.5%, respectively. For the three months ended March 31, 2026, the Company’s effective tax rate differs from the U.S. statutory tax rate of 21% primarily due to valuation allowances.

Income tax expense (benefit) was $(6.3) million and $(3.7) million for the six months ended March 31, 2026 and 2025, respectively. The effective tax rate for the six months ended March 31, 2026 and 2025 was 6.5% and 3.6%, respectively. For the six months ended March 31, 2026, the Company’s effective tax rate differs from the U.S. statutory tax rate of 21% primarily due to valuation allowances.

As of March 31, 2026 and September 30, 2025, the Company does not believe it has any significant uncertain tax positions and therefore, has not recorded any unrecognized tax benefits.

The Company evaluates the realizability of its deferred tax assets on a quarterly basis and establishes valuation allowances when it is more-likely-than-not that all or a portion of a deferred tax asset may not be realized. As of March 31, 2026 and September 30, 2025, the Company had recorded a full valuation allowance against deferred tax assets on Fluence Energy, Inc. primarily related to its investment in Fluence Energy, LLC, as well as on certain foreign subsidiaries based on the weight of available evidence, including cumulative losses. In the event that the valuation allowance related to tax benefits associated with the Tax Receivable Agreement, dated October 27, 2021, by and among Fluence Energy, Inc., Fluence Energy, LLC, Siemens Industry, Inc. and AES Grid Stability, LLC (the “Tax Receivable Agreement”), is released in a future period, a Tax Receivable Agreement liability will be recorded based on the amounts probable and reasonably estimable in accordance with ASC 450.

The Organization for Economic Cooperation and Development’s (“OECD”) Pillar II Initiative introduced a 15% global minimum tax for certain multinational groups exceeding minimum annual global revenue thresholds. Some countries in which the Company operates have enacted legislation adopting the minimum tax effective January 1, 2024. To date, the Company does not expect a material top up tax liability to be incurred as a result of the Pillar II provisions. Certain tax jurisdictions either did not have Pillar II enacted for the current fiscal year or the Company has satisfied one or more of the safe harbor tests to prevent any minimum tax under Pillar II. The Company will continue to monitor its jurisdictions for any changes and include appropriate minimum tax throughout the fiscal year.