Income Taxes (Tables)

12 Months Ended

Dec. 31, 2011

Schedule Of Effective Income Tax Rate Reconciliation


	Ameren			Ameren Missouri			Ameren Illinois			Genco
2011:
Statutory federal income tax rate:		35	%		35	%		35	%		35	%
Increases (decreases) from:
Production activities deduction		-			-			-			3
Depreciation differences		(1	)		(2	)		-			-
Amortization of investment tax credit		(1	)		(1	)		(1	)		(1	)
State tax		4			3			5			6
Tax credits		-			-			-			(1	)
Other permanent items^(a)		-			1			-			-
Effective income tax rate		37	%		36	%		39	%		42	%
2010:
Statutory federal income tax rate:		35	%		35	%		35	%		35	%
Increases (decreases) from:
Non-deductible impairment of goodwill		32			-			-			(144	)
Production activities deduction		-			-			-			7
Depreciation differences		(4	)		(3	)		-			-
Amortization of investment tax credit		(2	)		(1	)		(1	)		4
State tax		8			3			5			(14	)
Reserve for uncertain tax positions		(1	)		-			-			(6	)
Tax credits		(3	)		-			-			13
Change in federal tax law^(b)		3			1			-			(19	)
Other permanent items^(c)		-			-			-			(1	)
Effective income tax rate		68	%		35	%		39	%		(125	)%
2009:
Statutory federal income tax rate:		35	%		35	%		35	%		35	%
Increases (decreases) from:
Depreciation differences		(1	)		(3	)		(1	)		-
Amortization of investment tax credit		(1	)		(1	)		(1	)		-
State tax		5			3			5			4
Reserve for uncertain tax positions		(1	)		-			-			-
Other permanent items^(d)		(1	)		-			(1	)		(1	)
Tax credits		(1	)		(1	)		-			-
Effective income tax rate		35	%		33	%		37	%		38	%

(a)	Permanent items are treated differently for book and tax purposes and primarily include nondeductible expenses related to lobbying and stock issuance expenses for Ameren Missouri.

(b)	Relates to change in taxation of prescription drug benefits to retiree participants from the enactment in 2010 of the Patient Protection and Affordable Care Act and the Health Care and Education Reconciliation Bill of 2010.

(c)	Permanent items are treated differently for book and tax purposes and primarily include nondeductible expenses for Genco.

(d)

Permanent items are treated differently for book and tax purposes and primarily include Internal Revenue Code Section 199 production activity deductions for Ameren and Genco, company-owned life insurance for Ameren and Ameren Illinois, employee stock ownership plan dividends for Ameren, and nondeductible expenses for Ameren Illinois.

Schedule Of Components Of Income Tax Expense (Benefit)

	Ameren^(a)			Ameren Missouri			Ameren Illinois			Genco
2011:
Current taxes:
Federal	$	(27	)	$	3		$	(24	)	$	(21	)
State		(5	)		2			(4	)		(7	)
Deferred taxes:
Federal		273			129			123			43
State		76			31			34			18
Deferred investment tax credits, amortization		(7	)		(4	)		(2	)		(1	)
Total income tax expense	$	310		$	161		$	127		$	32
2010:
Current taxes:
Federal	$	13		$	(14	)	$	(20	)	$	(5	)
State		10			(15	)		(5	)		6
Deferred taxes:
Federal		274			206			132			22
State		36			27			32			(2	)
Deferred investment tax credits, amortization		(8	)		(5	)		(2	)		(1	)
Total income tax expense	$	325		$	199		$	137		$	20
2009:
Current taxes:
Federal	$	(73	)	$	(117	)	$	(8	)	$	22
State		3			(31	)		14			14
Deferred taxes:
Federal		337			239			64			57
State		74			42			11			9
Deferred investment tax credits, amortization		(9	)		(5	)		(2	)		(1	)
Total income tax expense	$	332		$	128		$	79		$	101

(a)	Includes amounts for Ameren registrant and nonregistrant subsidiaries and intercompany eliminations.

Schedule Of Deferred Tax Assets And Liabilities Resulting From Temporary Differences


	Ameren^(a)			Ameren Missouri			Ameren Illinois			Genco
2011:
Accumulated deferred income taxes, net liability (asset):
Plant related	$	3,811		$	2,134		$	1,003		$	457
Deferred intercompany tax gain/basis step-up		3			(1	)		55			(54	)
Regulatory assets, net		73			73			-			-
Deferred employee benefit costs		(367	)		(88	)		(109	)		(67	)
Purchase accounting		35			-			(27	)		15
ARO		(37	)		-			1			(25	)
Other		(223	)		6			(86	)		(22	)
Total net accumulated deferred income tax liabilities^(b)	$	3,295		$	2,124		$	837		$	304
2010:
Accumulated deferred income taxes, net liability (asset):
Plant related	$	3,310		$	1,974		$	750		$	378
Deferred intercompany tax gain/basis step-up		2			(2	)		71			(68	)
Regulatory assets (liabilities), net		67			68			(1	)		-
Deferred employee benefit costs		(360	)		(87	)		(124	)		(45	)
Purchase accounting		106			-			41			17
ARO		(48	)		(9	)		1			(27	)
Other		(120	)		7			(57	)		10
Total net accumulated deferred income tax liabilities^(c)	$	2,957		$	1,951		$	681		$	265

(a)	Includes amounts for Ameren registrant and nonregistrant subsidiaries and intercompany eliminations.

(b)	Includes $20 million, $8 million and $58 million as current assets recorded in the balance sheet for Ameren, Ameren Missouri and Ameren Illinois, respectively.

(c)	Includes $43 million as current assets recorded in the balance sheet for Ameren Illinois. Includes $71 million, $43 million and $12 million as current liabilities recorded in the balance sheets for Ameren, Ameren Missouri and Genco, respectively

Schedule Of Net Operating Loss Carryforwards And Tax Credit Carryforwards


	Ameren		Ameren Missouri		Ameren Illinois		Genco
Net operating loss carryforwards:
Federal^(a)	$	136	$	50	$	33	$	8
State^(b)		17		3		6		-
Total net operating loss carryforwards	$	153	$	53	$	39	$	8
Tax credit carryforwards:
Federal^(c)	$	72	$	11	$	-	$	1
State^(d)		28		1		-		4
Total tax credit carryforwards	$	100	$	12	$	-	$	5

(a)	These will begin to expire in 2028.

(b)	These will begin to expire in 2017.

(c)	These will begin to expire in 2029.

(d)	These will begin to expire in 2012.

Schedule Of Changes To Unrecognized Tax Benefits And Related Interest


	Ameren			Ameren Missouri			Ameren Illinois			Genco
Unrecognized tax benefits – January 1, 2009	$	110		$	20		$	-		$	48
Increases based on tax positions prior to 2009		90			76			-			9
Decreases based on tax positions prior to 2009		(84	)		(19	)		-			(31	)
Increases based on tax positions related to 2009		19			11			-			3
Changes related to settlements with taxing authorities		-			-			-			-
Decreases related to the lapse of statute of limitations		-			-			-			-
Unrecognized tax benefits – December 31, 2009	$	135		$	88		$	-		$	29
Increases based on tax positions prior to 2010		72			40			27			4
Decreases based on tax positions prior to 2010		(38	)		(12	)		(2	)		(16	)
Increases based on tax positions related to 2010		77			48			31			3
Changes related to settlements with taxing authorities		-			-			-			-
Decreases related to the lapse of statute of limitations		-			-			-			-
Unrecognized tax benefits – December 31, 2010	$	246		$	164		$	56		$	20
Increases based on tax positions prior to 2011		22			15			-			1
Decreases based on tax positions prior to 2011		(125	)		(63	)		(41	)		(12	)
Increases based on tax positions related to 2011		17			13			-			1
Changes related to settlements with taxing authorities		(10	)		(5	)		(4	)		-
Decreases related to the lapse of statute of limitations		(2	)		-			-			(1	)
Unrecognized tax benefits – December 31, 2011	$	148		$	124		$	11		$	9
Total unrecognized tax benefits (detriments) that, if recognized, would affect the effective tax rates as of December 31, 2009	$	6		$	3		$	-		$	-
Total unrecognized tax benefits that, if recognized, would affect the effective tax rates as of December 31, 2010	$	-		$	3		$	-		$	1
Total unrecognized tax benefits that, if recognized, would affect the effective tax rates as of December 31, 2011	$	1		$	1		$	-		$	1

Reconciliation Of Changes In Liability For Interest On Unrecognized Tax Benefits


	Ameren			Ameren Missouri			Ameren Illinois			Genco
Liability for interest – January 1, 2009	$	10		$	2		$	-		$	4
Interest charges (income) for 2009		(2	)		2			-			(2	)
Liability for interest – December 31, 2009	$	8		$	4		$	-		$	2
Interest charges for 2010		9			6			2			-
Liability for interest – December 31, 2010	$	17		$	10		$	2		$	2
Interest income for 2011		(11	)		(3	)		(1	)		(1	)
Interest payment		(1	)		(1	)		-			-
Liability for interest – December 31, 2011	$	5		$	6		$	1		$	1

- Definition

Tabular disclosure of tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities (i.e., uncertain tax positions) and other types of income tax contingencies, including: (1) the policy on classification of interest and penalties; (2) a tabular reconciliation of the total amounts of unrecognized tax benefits at the beginning and end of the period; the total amount(s) of: (3) unrecognized tax benefits that, if recognized, would affect the effective tax rate, and (4) interest and penalties recognized in each of the income statement and balance sheet; (5) for positions for which it is reasonably possible that the total amounts unrecognized will significantly change within 12 months of the reporting date the: (i) nature of the uncertainty, (ii) nature of the event that could occur that would cause the change, and (iii) an estimate of the range of the reasonably possible change or a statement that an estimate of the range cannot be made; and (6) a description of tax years that remain subject to examination by major tax jurisdictions.

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