Income Taxes (Tables)

6 Months Ended

Jun. 30, 2018

Status of Tax Reform Regulatory Proceedings

Registrant (Jurisdiction)	Change in Tax Rate	Excess ADIT Subject to Normalization Requirements	Excess ADIT Not Subject to Normalization Requirements
AEP Texas (Texas-Distribution)	Case Pending	Case Pending	Case Pending
AEP Texas (Texas-Transmission)	Order Issued	To be addressed in a later filing	To be addressed in a later filing
APCo (Virginia)	Legislation Enacted	Legislation Enacted	To be addressed in a later filing
APCo (West Virginia)	Case Pending	Case Pending	Case Pending
I&M (Indiana)	Order Issued	Order Issued	Order Issued
I&M (Michigan)	Case Pending	To be addressed in a later filing	To be addressed in a later filing
AEP (Tennessee)	Case Pending	Case Pending	Case Pending
AEP (Kentucky)	Order Issued	Order Issued	Order Issued
OPCo (Ohio)	Case Pending	Case Pending	Case Pending
PSO (Oklahoma)	Order Issued	Case Pending	Case Pending
SWEPCo (Arkansas)	Case Pending	Case Pending	Case Pending
SWEPCo (Louisiana)	Case Pending	To be addressed in a later filing	To be addressed in a later filing
SWEPCo (Texas)	Order Issued	To be addressed in a later filing	To be addressed in a later filing
PJM FERC Transmission	Settlement Approved	Settlement Approved	Settlement Approved
SPP FERC Transmission	To be addressed in a later filing	To be addressed in a later filing	To be addressed in a later filing

Estimated Provisions for Revenue Refund Related to Reduction in Corporate Federal Income Tax Rate

	AEP		AEP Texas		AEPTCo		APCo		I&M		OPCo		PSO		SWEPCo
	(in millions)
Increase in Current Liabilities	$	—	$	—	$	—	$	—	$	4.0	$	—	$	—	$	—
Increase in Deferred Credits and Other Noncurrent Liabilities	143.6		18.0		5.7		48.8		10.3		27.8		4.7		24.2

Estimated Provisions for Revenue Refund Offsetting Amortization of Excess ADIT

	AEP			AEP Texas			AEPTCo			APCo			I&M			OPCo			PSO			SWEPCo
	(in millions)
Decrease in Total Revenues	$	(33.3	)	$	(4.9	)	$	(0.2	)	$	(9.6	)	$	(1.2	)	$	(2.5	)	$	(4.6	)	$	(7.0	)
Increase in Current Liabilities	1.2			—			—			0.4			0.3			0.3			—			—
Increase in Deferred Credits and Other Noncurrent Liabilities	32.1			4.9			0.2			9.2			0.9			2.2			4.6			7.0

Schedule of Effective Income Tax Rate Reconciliation

	Three Months Ended June 30,				Six Months Ended June 30,
Company	2018		2017		2018		2017
AEP	12.0	%	34.6	%	15.0	%	36.5	%
AEP Texas	16.2	%	34.6	%	16.2	%	34.6	%
AEPTCo	22.1	%	34.2	%	21.4	%	33.9	%
APCo	17.0	%	36.5	%	17.8	%	36.5	%
I&M	0.7	%	27.6	%	7.6	%	29.6	%
OPCo	21.6	%	34.9	%	21.0	%	34.9	%
PSO	14.9	%	37.6	%	14.5	%	37.6	%
SWEPCo	12.4	%	29.7	%	14.0	%	32.4	%