skyworks solutions , inc . notes to consolidated financial statements 2014 ( continued ) maintained a valuation allowance of $ 47.0 million . this valuation allowance is comprised of $ 33.6 million related to u.s . state tax credits , of which $ 3.6 million are state tax credits acquired from aati in fiscal year 2012 , and $ 13.4 million related to foreign deferred tax assets . if these benefits are recognized in a future period the valuation allowance on deferred tax assets will be reversed and up to a $ 46.6 million income tax benefit , and up to a $ 0.4 million reduction to goodwill may be recognized . the company will need to generate $ 209.0 million of future united states federal taxable income to utilize our united states deferred tax assets as of september 28 , 2012 . deferred tax assets are recognized for foreign operations when management believes it is more likely than not that the deferred tax assets will be recovered during the carry forward period . the company will continue to assess its valuation allowance in future periods . as of september 28 , 2012 , the company has united states federal net operating loss carry forwards of approximately $ 74.3 million , including $ 29.5 million related to the acquisition of sige , which will expire at various dates through 2030 and $ 28.1 million related to the acquisition of aati , which will expire at various dates through 2031 . the utilization of these net operating losses is subject to certain annual limitations as required under internal revenue code section 382 and similar state income tax provisions . the company also has united states federal income tax credit carry forwards of $ 37.8 million , of which $ 30.4 million of federal income tax credit carry forwards have not been recorded as a deferred tax asset . the company also has state income tax credit carry forwards of $ 33.6 million , for which the company has provided a valuation allowance . the united states federal tax credits expire at various dates through 2032 . the state tax credits relate primarily to california research tax credits which can be carried forward indefinitely . the company has continued to expand its operations and increase its investments in numerous international jurisdictions . these activities will increase the company 2019s earnings attributable to foreign jurisdictions . as of september 28 , 2012 , no provision has been made for united states federal , state , or additional foreign income taxes related to approximately $ 371.5 million of undistributed earnings of foreign subsidiaries which have been or are intended to be permanently reinvested . it is not practicable to determine the united states federal income tax liability , if any , which would be payable if such earnings were not permanently reinvested . the company 2019s gross unrecognized tax benefits totaled $ 52.4 million and $ 32.1 million as of september 28 , 2012 and september 30 , 2011 , respectively . of the total unrecognized tax benefits at september 28 , 2012 , $ 38.8 million would impact the effective tax rate , if recognized . the remaining unrecognized tax benefits would not impact the effective tax rate , if recognized , due to the company 2019s valuation allowance and certain positions which were required to be capitalized . there are no positions which the company anticipates could change within the next twelve months . a reconciliation of the beginning and ending amount of gross unrecognized tax benefits is as follows ( in thousands ) : unrecognized tax benefits .

Table:
 | unrecognized tax benefits
balance at september 30 2011 | $ 32136
increases based on positions related to prior years | 9004
increases based on positions related to current year | 11265
decreases relating to settlements with taxing authorities | 2014
decreases relating to lapses of applicable statutes of limitations | -25 ( 25 )
balance at september 28 2012 | $ 52380
page 114 annual report .

Question: what amount of unrecognized tax benefits would not impact the effective tax rate , ( in millions ) ?
Answer: 13.6
Calculation: subtract(52.4, 38.8)