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Income Taxes
 9 Months Ended
Dec. 31, 2019
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes

The Company's effective tax rate from continuing operations ("ETR") was 29.1% and 0.6% for the three months ended December 31, 2019 and December 31, 2018, respectively, and (11.5)% and 17.7% for the nine months ended December 31, 2019 and December 31, 2018, respectively. For the three months ended December 31, 2019, the primary drivers of the ETR were the impact of previously unrecognized tax effects on the tax deductible goodwill impaired during the fiscal 2020 second quarter, the global mix of income, an increase in prior year U.S. federal research and development income tax credits, and an increase in unrecognized tax benefits primarily related to audit activity. For the nine months ended December 31, 2019, the primary drivers of the ETR were the impact of the non-deductible goodwill impairment charge, the non-taxable gain on the arbitration award, the global mix of income, an increase in unrecognized tax benefits primarily related to audit activity, and an increase in prior year U.S. federal research and development income tax credits, net. For the three months ended December 31, 2018, the primary drivers of the effective tax rate ("ETR") were the global mix of income, the net decrease in valuation allowances on certain foreign deferred tax assets, and the decrease in transition tax liability. For the nine months ended December 31, 2018, the primary drivers of the ETR were the global mix of income, the net decrease in valuation allowances on certain foreign deferred tax assets, the decrease in transition tax liability, the filing of the October 31, 2017 U.S. federal tax return and the impact of U.S. proposed regulations on the ability to claim certain foreign tax credits.

The tax expense associated with discontinued operations for the nine months ended December 31, 2019 was $0 million as compared to $18 million during the same period of the prior fiscal year. The primary driver of the variance in the tax expense for the nine months ended December 31, 2019 and December 31, 2018 was the difference in income before tax for the respective periods.

As the result of the issuance of new U.S. Treasury regulations in the first quarter of fiscal 2020, the Company changed its permanent reinvestment assertion in the first quarter of fiscal 2020 with respect to certain foreign corporations, reducing the amount that will ultimately be repatriated to the U.S. by approximately $498 million. With the exception of this change, DXC's prior permanent reinvestment assertion, that the Company will repatriate all current and accumulated earnings for all non-U.S. subsidiaries other than India, continues to apply. DXC does not believe this assertion change will have an adverse effect on the Company as U.S. cash needs will be satisfied from other sources of non-U.S. earnings.

In connection with the Separation of USPS, the Company entered into a tax matters agreement with Perspecta. Pursuant to the tax matters agreement, the Company generally will be responsible for tax liabilities arising prior to the Separation of USPS. Income tax liabilities transferred to Perspecta primarily relate to pre-HPES Merger periods, for which the Company is indemnified by HPE pursuant to the tax matters agreement between the Company and HPE. The Company is also liable to HPE for tax receivables and refunds which it receives from Perspecta related to pre-HPES Merger periods that were transferred to Perspecta. Pursuant to the tax matters agreement with Perspecta, the Company has recorded a tax indemnification receivable from Perspecta of $77 million and a tax indemnification payable to Perspecta of $64 million related to income tax and other tax liabilities. As a result of the HPES Merger, the Company continues to have a net receivable of $18 million from HPE, comprised of a $107 million tax indemnification receivable related to tax payables, a $43 million tax indemnification receivable related to uncertain tax positions (net of related deferred tax benefits), and $132 million of tax indemnification payable related to other tax receivables.

The IRS is examining CSC's federal income tax returns for fiscal 2008 through 2017. With respect to CSC's fiscal 2008 through 2010 federal tax returns, the Company previously entered into negotiations for a resolution through settlement with the IRS Office of Appeals. The IRS examined several issues for this audit that resulted in various audit adjustments. The Company and the IRS Office of Appeals have an agreement in principle as to some, but not all of these adjustments.
The Company has agreed to extend the statute of limitations associated with this audit through June 30, 2020.
 
In the first quarter of fiscal 2020, we filed for competent authority relief relating to certain legacy CSC foreign restructuring expenses deducted for the U.S. federal tax return for tax year March 31, 2013. The Company has agreed to extend the statute of limitations associated with the fiscal years 2011 through 2013 through December 31,2020. In the second quarter of fiscal 2020, the Company received a Revenue Agent's Report with proposed adjustments to CSC's fiscal 2014 through 2017 federal returns. The Company has filed a protest for certain of these adjustments with the IRS Office of Appeals. The Company has agreed to extend the statute of limitations for the fiscal 2014 through fiscal 2016 through December 31, 2020. The Company expects to reach a resolution for all years no earlier than the fourth quarter of fiscal 2021 except agreed issues related to fiscal 2008 through 2010 and fiscal 2011 through 2013 federal tax returns, which are expected to be resolved within twelve months.
 
In addition, the Company may settle certain other tax examinations, have lapses in statutes of limitations, or voluntarily settle income tax positions in negotiated settlements for different amounts than the Company has accrued for unrecognized tax benefits. In the third quarter of fiscal 2020 the Company’s liability for uncertain tax positions increased by $20 million (excluding interest and penalties and related tax attributes) largely due to additions for U.S. federal research and development credits and certain audits. The Company may need to accrue and ultimately pay additional amounts for tax positions that previously met a more-likely-than-not standard if such positions are not upheld. Conversely, the Company could settle positions by payment with the tax authorities for amounts lower than those that have been accrued or extinguish a position through payment. The Company believes the outcomes that are reasonably possible within the next 12 months may result in a reduction in liability for uncertain tax positions of $25 million to $28 million, excluding interest, penalties and tax carry-forwards.