Our provision for income taxes may not have the customary relationship of taxes to income. A reconciliation between the U.S. corporate income tax rate and the effective income tax rate was as follows:

(1)	If recognized, $1.1 million of the above amount of unrecognized tax benefits would reduce our 2020 effective income tax rate. We recognize interest and penalties related to uncertain tax positions in operating expenses within the consolidated statements of operations.

As of December 31, 2020, 2019 and 2018, we had recognized $1.1 million, $0.9 million and $1.6 million of accumulated pre-tax interest and penalties related to unrecognized tax benefits, respectively. We do not believe there is a reasonable possibility the total amount of the unrecognized tax benefits will significantly increase or decrease in the next twelve months considering recent settlements and the status of current and pending Internal Revenue Service (“IRS”) examinations. Settlement agreements applicable to tax years 1995 to 2003 were executed in 2018 with the Department of Justice, as previously approved by the Joint Committee of Taxation in August 2017. In 2019, an IRS 30-day letter on examination of tax years 2009 through 2012 was received, the proposed adjustments found acceptable, and associated tax settlements subsequently occurred in 2020, within the period of the extended statute of limitation. The IRS continued examination of tax years 2015 through 2017 and initiated examination of tax year 2018.

Net Deferred Income Taxes

Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Our significant components of net deferred income taxes were as follows:


	December 31,
	2020		2019

	(in millions)
Deferred income tax assets:
Investments, including derivatives	$	588.4	$	237.0
Insurance liabilities		552.4		143.2
Net operating and capital loss carryforwards		69.2		71.1
Tax credit carryforwards		4.6		106.0
Employee benefits		389.1		338.9
Foreign currency translation		9.7		14.0
Other deferred income tax assets		52.5		45.2
Gross deferred income tax assets		1,665.9		955.4
Valuation allowance		(18.4)		(16.7)
Total deferred income tax assets		1,647.5		938.7
Deferred income tax liabilities:
Deferred acquisition costs		(522.6)		(562.9)
Investments, including derivatives		(990.4)		(443.7)
Net unrealized gains on available-for-sale securities		(1,762.1)		(1,039.9)
Real estate		(158.5)		(147.9)
Intangible assets		(387.5)		(342.3)
Other deferred income tax liabilities		(43.4)		(75.0)
Total deferred income tax liabilities		(3,864.5)		(2,611.7)
Total net deferred income tax liabilities	$	(2,217.0)	$	(1,673.0)

Our net deferred income taxes by jurisdiction were as follows:


	December 31,
	2020		2019

	(in millions)
Deferred income tax assets:
State	$	81.1	$	94.9
Foreign		32.7		28.7
Net deferred income tax assets		113.8		123.6
Deferred income tax liabilities:
U.S. federal		(2,011.8)		(1,507.6)
Foreign		(319.0)		(289.0)
Net deferred income tax liabilities		(2,330.8)		(1,796.6)
Total net deferred income tax liabilities	$	(2,217.0)	$	(1,673.0)

In management’s judgment, total deferred income tax assets are more likely than not to be realized. Included in the deferred income tax asset are tax carryforwards available to offset future taxable income or income taxes. As of December 31, 2020 and 2019, we had tax credit carryforwards for U.S. federal income tax purposes of $4.6 million and $106.0 million, respectively. Alternative minimum, foreign and general business tax credit carryovers were generated during and since the period we utilized net operating losses, primarily attributable to our captive reinsurance companies that joined our consolidated U.S. federal income tax return beginning in 2012 and 2013. The AMT credit carryforwards became refundable in 2018 and were fully recovered in 2018, and the foreign tax credit carryforwards were fully utilized in 2020. The general business credit carryforward will expire by 2040 if unused. As of December 31, 2020, all accumulated U.S. federal tax credit carryforwards are anticipated to be utilized before expiration; therefore, no valuation allowance has been provided for the related deferred income tax assets.

As of December 31, 2020 and 2019, domestic state net operating loss carryforwards were $269.5 million and $190.4 million, respectively, and will expire between 2032 and 2039. As of December 31, 2020 and 2019, foreign net operating loss carryforwards were $170.3 million and $186.1 million, respectively, with some expiring in 2020 while others never expire. We maintain valuation allowances by jurisdiction against the deferred income tax assets related to some of these carryforwards and other items, as utilization of these income tax benefits fail the more likely than not criteria in certain jurisdictions. As of December 31, 2020 and 2019, valuation allowances of $18.4 million and $16.7 million, respectively, had been recorded against the income tax benefits associated primarily with foreign net operating loss carryforwards. Adjustments to the valuation allowance will be made if there is a change in management’s assessment of the amount of the deferred income tax assets that are more likely than not to be realized. Provisions of the U.S. tax reform did not affect the valuation allowance assessment.

The effects of tax legislation on deferred taxes are recognized in the period of enactment. The State of Iowa coupled with the Internal Revenue Code effective January 1, 2019, and subsequently issued interpretative guidance in the fourth quarter of 2019 on application of the U.S. Global Intangible Low Taxed Income rules. The State of Iowa's interpretation resulted in an $11.1 million increase in total income tax expense for adjustments to deferred tax assets and liabilities in our 2019 financial statements. Iowa legislation was enacted on June 29, 2020 to de-couple from the federal application of the U.S. Global Intangible Low Taxed Income rules effective retroactively to January 1, 2019; therefore, the above-mentioned increase in total income tax expense reported in 2019 was reversed in 2020. Proposed regulations issued August 1, 2018, clarifying the calculation of the one-time deemed repatriation tax, allowed for final determination of the 2017 provisional amount. The impact of final §965 regulations issued on January 15, 2019, and subsequent clarification was immaterial. The provisional amount of $43.0 million reported in 2017 was adjusted by $5.9 million in 2018 to $48.9 million to reflect the SEC's Staff Accounting Bulletin No. 118 final determination within the required one-year measurement period.

Deferred tax liabilities are recognized for taxes payable on the unremitted earnings from foreign operations of our subsidiaries, except where it is our intention to indefinitely reinvest a portion or all of these undistributed earnings. As of December 31, 2020 and 2019, any applicable taxes that would be due upon repatriation were not provided on approximately $997.4 million and $1,001.5 million, respectively, of such accumulated but undistributed earnings from operations of foreign subsidiaries. We currently do not intend to repatriate these unremitted earnings because we have several liquidity options to fund our domestic operations and obligations. These options include investing and financing activities, such as issuing debt, as well as cash flow and dividends from domestic operations. As of December 31, 2020 and 2019, it was not practicable to determine the amount of the unrecognized deferred tax liability that would arise if foreign earnings were remitted, due to the complexity of our international holding company structure, and other significant tax attributes and varying state tax laws. Under the participation exemption available on distributions post-U.S. tax reform, taxes on remittances would be limited to foreign currency gains or losses, foreign withholding taxes, and state income taxes, which we would anticipate to be immaterial. As of December 31, 2020, deferred taxes were also not provided on the approximately $106.2 million of excess book carrying value over tax basis with respect to the original investment in our foreign subsidiaries. A tax liability will be recognized when we no longer plan to indefinitely reinvest a portion or all of these earnings or when we plan to sell a portion or all of our ownership interest.

Other Tax Information

Income tax returns are filed in U.S. federal jurisdiction as well as various states and foreign jurisdictions where we and one or more of our subsidiaries conduct business. Although determined by jurisdiction, with few exceptions our tax uncertainties relate primarily to the U.S. federal jurisdiction. The IRS has completed examination of our consolidated U.S. federal income tax returns for years prior to 2015. A settlement was reached in 2018 with the Department of Justice involving a suit in the Court of Federal Claims, requesting refunds for the years 1995-2003. IRS claims for refund for tax years 2004 through 2008, following settlement of a partnership matter with the Department of Justice in March 2019, were finalized in 2020 following review by the Joint Committee of Taxation. As of December 31, 2020 and 2019, we had $54.6 million and $195.3 million, respectively, of current income tax receivables associated with outstanding audit issues reported as other assets in our consolidated statements of financial position.

Refund claims filed for tax years 2006 through 2008 in 2015 were received in September 2020. The IRS commenced audit of our U.S. federal income tax return for 2009 in 2011, 2010 in 2012, 2011 in 2013, 2012 in 2015, 2015 through 2017 in 2019 and 2018 in the fourth quarter of 2020. The U.S. federal statute of limitations expired for years prior to 2009, except for pending audit issues. The statute was extended until June 30, 2021, for 2009 through 2012 although effectively settled, has expired for 2013 and 2014, and was extended for tax years 2015 and 2016 through October 15, 2021. The statute remains open for tax years 2017 and 2018 through October 15, 2021 and 2022, respectively. The ultimate settlement of earlier tax years can be adjusted into subsequent tax years regardless of statute status. We do not expect the results of these audits, subsequent related adjustments or developments in other tax areas for all open tax years to significantly change the possible increase in the amount of unrecognized tax benefits, but the outcome of tax reviews is uncertain and unforeseen results can occur.

We believe we have adequate defenses against, or sufficient provisions for, contested issues, but final resolution could take several years depending on whether legal remedies are pursued. Consequently, we do not believe issues that might arise in tax years subsequent to 2014 will have a material impact on our net income.