<prompt> Human: Throwaway because personal info. I got a Notice of Proposed Tax Due for Illinois Individual Income Tax. It came with an Examiners Report that says I owe thousands in income tax, late payment and interest for 2010.Relevant Info... I didnt live in Illinois during 2010. I was in California mostly and another state for a month of work. Because I move a lot and dont want important letters getting stuck in forwarding or something I used my parents address as my mailing address. I have been doing this for years. Now I know thats not a good idea. I did taxes that year with TurboTax. I dont have to pay the giant bill, emergency fund was emptied earlier this year for med bills. Im really stressed and need to respond to them asap because theyll add more penalties in 10 days. :I have not called the Illinois Department of Revenue yet because I dont know what Im doing. I dont want to say something wrong and have it go in a file somewhere.My Questions... Is it as simple as sending an amended 2010 return with my old CA address? If its that, I should file amended returns for other years I did this so I dont run into the same issue?utaxmankeith where are youTL; DR- State of Illinois charged me for income tax for 2010 due to IL mailing address. Lesson learned but still screwed with huge tax bill and panicking.Assistant: Did you pay California taxes during that time? You can argue that your mailing address was in Illinois, but your physical address was in California. You wouldnt be lying.Human: Yes, I paid CA taxes. Thats what I thought I had done, put mailing address as IL but that was through TurboTax where you just plug in info and it gets sorted into forms. I didnt know enough to check and I guess still dont quite understand.Assistant: You should just respond and explain the situation. If you earned your income in California, lived in California, and paid taxes in California, you do not owe Illinois any money. From Illinois perspective, they think you lived there because of your address, and they know you paid x amount in federal taxes. You should not have any additional tax liability. Remember, its a proposed tax. You can counter with the facts and not pay a dime.Human: Man I hope so. Illinoiss debt is in the billions so I feel like theyll fight for any small amount.  <response>: They will only fight if they have a chance of winning, if you didnt actually live there and can prove that you paid your CA taxes you dont owe them anything. 