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How to know more about my tax situation in the States
The LLC (not you) is probably in debt to the California FTB. Any LLC registered in California must pay at least $800 a year, until it is officially dissolved (i.e.: notice of cancellation/dissolution properly filed with the California Secretary of State). The FTB may come after members (including you) personally, if it can prove that the failure to pay was due to your negligence. Talk to a CA-licensed EA/CPA about how to resolve this. Otherwise, at least from what you've described, there were no other taxable events. LLC is a disregarded entity, so the IRS doesn't care about it much anyway (unless someone was stupid enough to elect it to be taxed as a corporation, that is). Keep in mind that when in doubt - you are always better off with a professional (a CPA/EA licensed in your State) advice.