TurboTax can not be used for those years. the state return is not available. that leaves you with preparing paper returns for those years or doing nothing and let Ca do whatever they can legally do. Ca, if they believe you owe, can place liens on your assets and levy your bank accounts. The issue is the statute of limitations for state income tax purposes. if you file the time period that the state can levy starts to run but if you never file the clock never starts so they can go after you forever.
