Income Taxes (Tables)

12 Months Ended

Dec. 31, 2023

Schedule Of Effective Income Tax Rate Reconciliation

The following table presents the principal reasons for the difference between the effective income tax rate and the federal statutory corporate income tax rate for the years ended December 31, 2023, 2022, and 2021:


	Ameren Missouri		Ameren Illinois		Ameren
2023
Federal statutory corporate income tax rate	21	%	21	%	21	%
Increases (decreases) from:
Amortization of excess deferred income taxes(a)	(15)		(2)		(8)

Amortization of deferred investment tax credit	(1)		—		—
Production and other tax credits(b)	(10)		—		(4)
State tax	3		7		5


Effective income tax rate	(2)	%	26	%	14	%
2022
Federal statutory corporate income tax rate	21	%	21	%	21	%
Increases (decreases) from:
Amortization of excess deferred income taxes(a)	(15)		(2)		(8)

Amortization of deferred investment tax credit	(1)		—		—
Production and other tax credits(b)	(10)		—		(4)
State tax	3		7		5


Effective income tax rate	(2)	%	26	%	14	%
2021
Federal statutory corporate income tax rate	21	%	21	%	21	%
Increases (decreases) from:
Amortization of excess deferred income taxes(a)	(15)		(3)		(8)

Amortization of deferred investment tax credit	(1)		—		—
Production and other tax credits(b)	(7)		—		(3)
State tax	3		7		5
Stock-based compensation	—		—		(1)
Effective income tax rate	1	%	25	%	14	%

(a)Reflects the amortization of amounts resulting from the revaluation of deferred income taxes subject to regulatory ratemaking, which are being refunded to customers. Deferred income taxes are revalued when federal or state income tax rates change, and the offset to the revaluation of deferred income taxes subject to regulatory ratemaking is recorded to a regulatory asset or liability.

(b)The benefit of the credits associated with Missouri renewable energy standard compliance is refunded to customers through the RESRAM.

Schedule Of Components Of Income Tax Expense (Benefit)

The following table presents the components of income tax expense (benefit) for the years ended December 31, 2023, 2022, and 2021:


	Ameren Missouri		Ameren Illinois		Other		Ameren
2023
Current taxes:
Federal	$	(37)	$	27	$	(37)	$	(47)
State	1		5		(5)		1
Deferred taxes:
Federal	102		123		35		260
State	9		71		(10)		70
Amortization of excess deferred income taxes	(80)		(17)		(1)		(98)
Amortization of deferred investment tax credits	(3)		—		—		(3)
Total income tax expense (benefit)	$	(8)	$	209	$	(18)	$	183
2022
Current taxes:
Federal	$	(26)	$	46	$	(15)	$	5
State	(5)		16		(10)		1
Deferred taxes:
Federal	93		82		19		194
State	18		48		14		80
Amortization of excess deferred income taxes	(86)		(13)		(1)		(100)
Amortization of deferred investment tax credits	(4)		—		—		(4)
Total income tax expense (benefit)	$	(10)	$	179	$	7	$	176
2021
Current taxes:
Federal	$	—	$	(15)	$	22	$	7
State	—		(7)		1		(6)
Deferred taxes:
Federal	65		120		(15)		170
State	23		59		4		86
Amortization of excess deferred income taxes	(81)		(14)		(1)		(96)
Amortization of deferred investment tax credits	(4)		—		—		(4)
Total income tax expense	$	3	$	143	$	11	$	157

Schedule Of Deferred Tax Assets And Liabilities Resulting From Temporary Differences

The following table presents the accumulated deferred income tax assets and liabilities recorded as a result of temporary differences and accumulated deferred investment tax credits at December 31, 2023 and 2022:


	Ameren Missouri		Ameren Illinois		Other		Ameren
2023
Accumulated deferred income taxes, net liability (asset):
Plant-related	$	2,370	$	2,030	$	246	$	4,646
Regulatory assets and liabilities, net	(206)		(184)		(23)		(413)
Deferred employee benefit costs	(48)		55		(33)		(26)
Tax carryforwards	(124)		(33)		(61)		(218)
Other	104		38		19		161
Total net accumulated deferred income tax liabilities (assets)	2,096		1,906		148		4,150
Accumulated deferred investment tax credits	26		—		—		26
Accumulated deferred income taxes and investment tax credits	$	2,122	$	1,906	$	148	$	4,176
2022
Accumulated deferred income taxes, net liability (asset):
Plant-related	$	2,297	$	1,880	$	239	$	4,416
Regulatory assets and liabilities, net	(233)		(193)		(23)		(449)
Deferred employee benefit costs	(55)		28		(43)		(70)
Tax carryforwards	(122)		(34)		(72)		(228)
Other	70		18		22		110
Total net accumulated deferred income tax liabilities (assets)	1,957		1,699		123		3,779
Accumulated deferred investment tax credits	25		—		—		25
Accumulated deferred income taxes and investment tax credits	$	1,982	$	1,699	$	123	$	3,804

Schedule Of Net Operating Loss Carryforwards And Tax Credit Carryforwards

The following table presents the components of accumulated deferred income tax assets relating to net operating loss carryforwards and tax credit carryforwards at December 31, 2023 and 2022:


	Ameren Missouri		Ameren Illinois		Other		Ameren
2023
Net operating loss carryforwards:

State(a)	$	—	$	26	$	16	$	42
Total net operating loss carryforwards	$	—	$	26	$	16	$	42
Tax credit carryforwards:
Federal(b)	$	124	$	5	$	45	$	174
State(c)	—		2		—		2

Total tax credit carryforwards	$	124	$	7	$	45	$	176



2022
Net operating loss carryforwards:
Federal	$	3	$	4	$	4	$	11
State	1		26		9		36
Total net operating loss carryforwards	$	4	$	30	$	13	$	47
Tax credit carryforwards:
Federal	$	118	$	3	$	55	$	176
State	—		1		4		5

Total tax credit carryforwards	$	118	$	4	$	59	$	181

(a)Will expire between 2032 and 2043.

(b)Will expire between 2030 and 2043.

(c)Will expire between 2025 and 2028.