Income Taxes

Income Tax Expense

The table below shows our consolidated income tax expense and our effective tax rates for the periods indicated (in millions):



	Three Months Ended March 31,
	2020			2019
Income tax expense	$	46		$	10
Effective tax rate	26		%	5		%

Our income tax rates do not bear a customary relationship to statutory income tax rates primarily as a result of the effect of our NOLs and changes in unrecognized tax benefits and valuation allowances. For the three months ended March 31, 2020 and 2019, our income tax expense is largely comprised of state and foreign income taxes in jurisdictions where we do not have NOLs, the effect of applying the intraperiod tax allocation rules to our results of operations and related tax expense and timing differences between the recognition of federal income tax expense and corresponding NOL valuation allowance.

Income Tax Audits — We remain subject to periodic audits and reviews by taxing authorities; however, we do not expect these audits will have a material effect on our tax provision. Any NOLs we claim in future years to reduce taxable income could be subject to IRS examination regardless of when the NOLs were generated. Any adjustment of state or federal returns could result in a reduction of deferred tax assets rather than a cash payment of income taxes in tax jurisdictions where we have NOLs. We are currently under various state income tax audits for various periods.

Valuation Allowance — U.S. GAAP requires that we consider all available evidence, both positive and negative, and tax planning strategies to determine whether, based on the weight of that evidence, a valuation allowance is needed to reduce the value of deferred tax assets. Future realization of the tax benefit of an existing deductible temporary difference or carryforward ultimately depends on the existence of sufficient taxable income of the appropriate character within the carryback or carryforward periods available under the tax law. For purposes of this evaluation, due to historical volatility in taxable earnings, we are unable to assume future earnings; however, we are able to consider available tax planning strategies.

Unrecognized Tax Benefits — At March 31, 2020, we had unrecognized tax benefits of $29 million. If recognized, $17 million of our unrecognized tax benefits could affect the annual effective tax rate and $12 million, related to deferred tax assets, could be offset against the recorded valuation allowance resulting in no effect on our effective tax rate. We had accrued interest and penalties of $3 million for income tax matters at March 31, 2020. We recognize interest and penalties related to unrecognized tax benefits in income tax expense on our Consolidated Condensed Statements of Operations.