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Income Taxes
6 Months Ended
Jun. 30, 2011
Income Taxes  
Income Taxes
10. INCOME TAXES
     Under Swiss law, a resident company is subject to income tax at the federal, cantonal and communal levels that is levied on net income. Income attributable to permanent establishments or real estate located abroad is excluded from the Swiss tax base. Allied World Switzerland is a holding company and, therefore, is exempt from cantonal and communal income tax. As a result, Allied World Switzerland is subject to Swiss income tax only at the federal level. Allied World Switzerland is a resident of the Canton of Zug and, as such, is subject to an annual cantonal and communal capital tax on the taxable equity of Allied World Switzerland in Switzerland. Allied World Switzerland has a Swiss operating company resident in the Canton of Zug. The operating company is subject to federal, cantonal and communal income tax and to annual cantonal and communal capital tax.
     Under current Bermuda law, Allied World Bermuda and its Bermuda subsidiaries are not required to pay taxes in Bermuda on either income or capital gains. Allied World Bermuda and Allied World Assurance Company, Ltd have received an assurance from the Bermuda Minister of Finance under the Exempted Undertakings Tax Protection Act 1966 of Bermuda, that in the event of any such taxes being imposed, Allied World Bermuda and Allied World Assurance Company, Ltd will be exempted until March 2035.
     Certain subsidiaries of Allied World Switzerland file U.S. federal income tax returns and various U.S. state income tax returns, as well as income tax returns in the United Kingdom, Ireland, Switzerland, Hong Kong and Singapore. The following tax years by jurisdiction are open to examination:

         
    Fiscal Years
U.S. Internal Revenue Service for the U.S. subsidiaries
    2007— 2010  
Inland Revenue for the U.K. branches
    2009 — 2010  
Irish Revenue Commissioners for the Irish subsidiaries
    2006 — 2010  
Swiss Federal Tax Administration for the Swiss branch
    2008 — 2010  
Inland Revenue Department for the Hong Kong branch
    2009 — 2010  
Inland Revenue Department for the Singapore branch
    2010  
     To the best of the Company's knowledge, there are no examinations pending by any tax authority.
     Management has deemed that all material tax positions will more likely than not be sustained based on technical merits if challenged. The Company does not expect any material unrecognized tax benefits within 12 months of January 2011.