. a portion of these carryforwards was acquired from the company 2019s previous acquisitions , the utilization of which is subject to certain limitations imposed by the internal revenue code . the remaining benefits from tax losses and credits do not expire . as of september 30 , 2006 and september 24 , 2005 , a valuation allowance of $ 5 million was recorded against the deferred tax asset for the benefits of state operating losses that may not be realized