Income Taxes

The provision for income taxes results in effective tax rates that differ from the statutory rates. The following is a reconciliation between the statutory U.S. Federal income tax rate and the Company’s effective income tax rate on income before income taxes:



	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
Statutory rate	35.0	%	35.0	%	35.0	%	35.0	%
State taxes	1.2		0.9		1.2		0.9
Domestic production activities deduction	(1.8	)	(2.2	)	(1.9	)	(2.2	)
Noncontrolling interest in partially-owned subsidiaries	(0.9	)	(1.1	)	(0.9	)	(1.2	)
Other, net	0.3		—		0.3		0.1
Effective rate	33.8	%	32.6	%	33.7	%	32.6	%

Our effective tax rate reflects the Company's estimate for 2015 of its state income tax expense, the current tax benefit available for U.S. manufacturing activities, and income attributable to the noncontrolling interests in TRIP Holdings and RIV 2013 for which no income tax expense is provided. See Note 5 Partially-Owned Leasing Subsidiaries for a further explanation of activities with respect to TRIP Holdings and RIV 2013.

Taxing authority examinations

The IRS field work for our 2006-2008 audit cycle has concluded and all issues, except for transfer pricing, have been agreed upon and tentatively settled. The transfer pricing issue has been appealed, and we are working with both the U.S. and Mexican taxing authorities to coordinate taxation in a formal mutual agreement process (“MAP”). During 2013, we received the revenue agent report for the 2009-2011 audit cycle. All issues have been concluded and agreed to except for transfer pricing issues. The transfer pricing issues have been appealed, and we have requested they be addressed in the same MAP as the 2006-2008 cycle. At this time, we cannot determine when the 2006-2008 or the 2009-2011 cycles will close and all issues formally settled.

We have various subsidiaries in Mexico that file separate tax returns and are subject to examination by taxing authorities at different times. The 2007 tax year of one of our Mexican subsidiaries is still under review for transfer pricing purposes only, and its statute of limitations remains open through the later of the resolution of the MAP or July 2018. In addition, one of our Mexican subsidiaries is under examination for its 2011 tax year. The remaining entities are generally open for their 2009 tax years and forward.

Our two Swiss subsidiaries, one of which is a holding company and the other of which is dormant, have been audited by the taxing authorities through 2008 and 2009, respectively. The statute of limitations in Switzerland is generally five years from the end of the tax year, but can be extended up to 15 years in certain cases if the audit has commenced during the original five year period. We also currently have sales offices in multiple foreign jurisdictions that are subject to various statutes of limitations with regard to their tax status. Generally, states’ statutes of limitations in the U.S. are open from 2003 forward due to the use of tax loss carryforwards in certain jurisdictions.

Unrecognized tax benefits

The change in unrecognized tax benefits for the six months ended June 30, 2015 and 2014 was as follows:



	Six Months Ended June 30,
	2015			2014
	(in millions)
Beginning balance	$	62.3		$	55.0
Additions for tax positions related to the current year	2.7			2.6
Reductions for tax positions of prior years	(0.1		)	(0.1		)
Settlements	(0.2		)	—
Ending balance	$	64.7		$	57.5

Additions for tax positions related to the current year in the amounts of $2.7 million and $2.6 million recorded in the six months ended June 30, 2015 and 2014, respectively, were amounts provided for tax positions that will be taken for Federal and state income tax purposes when we file those tax returns. The reductions in tax positions of prior years of $0.1 million and $0.1 million for the six months ended June 30, 2015 and 2014, respectively, were primarily related to changes in state taxes. Settlements during the six months ended June 30, 2015 were due to a state tax position effectively settled upon audit. The total amount of unrecognized tax benefits including interest and penalties at June 30, 2015 and 2014, that would affect the Company’s overall effective tax rate if recognized was $15.3 million and $14.0 million, respectively.

Trinity accounts for interest expense and penalties related to income tax issues as income tax expense. Accordingly, interest expense and penalties associated with an uncertain tax position are included in the income tax provision. The total amount of accrued interest and penalties as of June 30, 2015 and December 31, 2014 was $12.1 million and $11.6 million, respectively. Income tax expense for the three and six months ended June 30, 2015, included an increase in income tax expense of $0.3 million and $0.5 million in interest expense and penalties, respectively, related to uncertain tax positions. Income tax expense for the three and six months ended June 30, 2014, included an increase in income tax expense of $0.2 million and $0.4 million in interest expense and penalties, respectively, related to uncertain tax positions.