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Income Taxes | 9 Months Ended
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Sep. 30, 2015
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Income Taxes | 4. Income Taxes TDS’ overall effective tax rate on Income (loss) before income taxes for the three and nine months ended September 30, 2015 were 42.1% and 40.3%, respectively. The effective tax rates for the three and nine months ended September 30, 2014 were negative and not meaningful due to the impact of several items on tax expense, including: A $40.8 million tax expense related to a valuation allowance recorded against certain state deferred tax assets that TDS determined were not realizable, on a more likely than not basis. A $10.8 million tax benefit due to a valuation allowance reduction for federal net operating losses previously limited under loss utilization rules. Due to the shutdown of Airadigm’s consumer wireless business and resulting intercompany sale of certain assets by Airadigm to U.S. Cellular during the period, Airadigm is expected to recognize sufficient taxable income for TDS to utilize the previously limited net operating losses. A $19.9 million expense related to a portion of the goodwill impairment of the HMS reporting unit recorded in the third quarter of 2014, which is nondeductible for income tax purposes.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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