v3.26.1
Income Taxes
 6 Months Ended
Jun. 30, 2026
Income Tax Disclosure [Abstract]  
Income Taxes INCOME TAXES
The following table presents the principal reasons for the difference between the effective income tax expense and rate and the federal statutory corporate income tax expense and rate for the three and six months ended June 30, 2026 and 2025:
Three MonthsThree MonthsSix MonthsSix Months
2026202520262025
AmountEffective Tax RateAmountEffective Tax RateAmountEffective Tax RateAmountEffective Tax Rate
Ameren
Federal statutory corporate income tax expense and rate$77 21 %$67 21 %$165 21 %$139 21 %
State and local taxes, net of federal income tax(a)
20 5 20 5 41 5 40 5 
Tax credits
Renewable energy tax credits(b)
(18)(5)(16)(4)(33)(4)(28)(4)
Other— — (3)(1)(3)— (5)(1)
Nontaxable or nondeductible items(3)(1)(1)— (4)(1)(2)— 
Other adjustments
Amortization of excess deferred income taxes(c)
(18)(5)(23)(7)(42)(5)(47)(7)
Depreciation differences(6)(1)(1)(1)(12)(2)(4)— 
Effective income tax expense and rate$52 14 %$43 13 %$112 14 %$93 14 %
Ameren Missouri
Federal statutory corporate income tax expense and rate$33 21 %$33 21 %$50 21 %$43 21 %
State and local taxes, net of federal income tax(a)
4 3 4 3 6 3 6 3 
Tax credits
Renewable energy tax credits(b)
(16)(10)(10)(7)(21)(9)(13)(7)
Other— — (3)(1)(2)(1)(4)(1)
Other adjustments
Amortization of excess deferred income taxes(c)
(16)(10)(16)(10)(24)(10)(19)(10)
Depreciation differences(4)(3)(1)(1)(5)(2)(2)— 
Effective income tax expense and rate$1 1 %$7 5 %$4 2 %11 6 %
Ameren Illinois
Federal statutory corporate income tax expense and rate$42 21 %$37 21 %$115 21 %$103 21 %
State and local taxes, net of federal income tax(a)
16 7 12 7 42 7 36 7 
Nontaxable or nondeductible items(1)— — — (1)— — — 
Other adjustments
Amortization of excess deferred income taxes(c)
(2)(1)(7)(4)(7)(1)(18)(4)
Depreciation differences(2)(1)(1)(1)(5)(1)(4)— 
Effective income tax expense and rate$53 26 %$41 23 %$144 26 %$117 24 %
(a)State taxes in Missouri and Illinois made up the majority of the tax effect in this category for Ameren, Ameren Missouri, and Ameren Illinois.
(b)The benefit of the credits associated with Missouri renewable energy standard compliance is refunded to customers through the RESRAM. The benefit of the credits associated with the production and investment tax credit tracker will be refunded to customers based on MoPSC approval in a regulatory rate review.
(c)Reflects the amortization of a regulatory liability resulting from the revaluation of accumulated deferred income taxes subject to regulatory ratemaking, which are being refunded to customers.