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.
You should probably talk to a professional tax adviser. This doesn't seem to be a common situation. From the top of my head, without being a lawyer or a tax professional, I think of it like this: The income is for year 200..., and should have been taxed then. You constructively received it then, and not claimed it. You probably had withholding from this salary that should have been reported to you then on W2 (you can get a copy from the IRS). I'd say you're to amend the return for year 200... with the new income, if it wasn't reported then. Although if more than 3 years passed (6, if its 25% or more of your gross income for that year), its beyond statute. However, as I said, I'm not a lawyer and not a professional tax adviser, so you cannot in any way rely on my opinion for anything that would result in not paying any taxes or penalties you should have. You should talk to a licensed tax professional (EA/CPA/Lawyer licensed in your State). "especially considering it has a mortgage on it (technically a home   equity loan on my primary residence). I'm not following. Does it have a mortgage on it, or your primary residence (a different property) was used as a security for the loan? If it is HELOC from a different property - then it is really your business what to do with it. You can spend it all on casinos in Vegas for all that the bank cares. Is this a complicated transaction? Any gotchas I should be aware of   before embarking on it? Obviously you should talk to an attorney and a tax adviser. But here's my two cents: Don't fall for the ""incorporate in Nevada/Delaware/Wyoming/Some other lie"" trap. You must register in the State where you live, and in the State where the property is. Incorporating in any other State will just add complexity and costs, and will not save you anything whatsoever. 2.1 State Taxes - some States tax LLCs. For example, in California you'll pay at least $800 a year just for the right of doing business. If you live in California or the property is in California - you will pay this if you decide to set up an LLC. 2.2 Income taxes - make sure to not elect to tax your LLC as a corporation. The default for LLC is ""disregarded"" status and it will be taxed for income tax purposes as your person. I.e.: IRS doesn't care and doesn't know about it (and most States, as well). If you actively select to tax it as a corporation (there's such an option) - it will cost you very dearly. So don't, and if someone suggest such a thing to you - run away from that person as fast as you can. Mortgages - it is very hard to get a mortgage when the property is under the LLC. If you already have a mortgage on that property (the property is the one securing the loan) - it may get called once you transfer it into LLC, since from bank's perspective that would be transferring ownership. Local taxes - transferring into LLC may trigger a new tax assessment. If you just bought the property - that will probably not matter much. If it appreciated - you may get hit with higher property taxes. There are also many little things - once you're a LLC and not individual you'll have to open a business bank account, will probably need a new insurance policy, etc etc. These don't add much to costs and are more of an occasional nuisance." This is a common occurrence, I know people who moved and then only remember the next spring during tax season that they never filed a new state version of a W-4. Which means for 3 or 4 months in the new year money is sent to the wrong state capital, and way too much was sent the previous year. In the spring of 2016 you should have filed a non-resident tax form with Michigan. On that form you would specify your total income numbers, your Michigan income numbers, and your other-state income numbers; with Michigan + other equal to total. That should have resulted in getting all the state taxes that were sent to Michigan returned.  It is possible that the online software is unable to complete the non-resident tax form. Not all forms and situations can be addressed by the software. So you may need to fill out paper forms. You should be able to find what you need on the state of Michigan website for 2015 Taxes. A quick read shows that you will probably need the Michigan 1040, schedule 1 and Schedule NR You may run into an issue if your license, car registration, voter registration, and other documentation point to you being a resident for the part of the year you earned that income. That means you will have to submit Form 3799 Statement to Determine State of Domicile You want to do this soon because there are deadlines that limit how far back you can files taxes. The state may also get tax information from the IRS and could decide that all your income from 2015 should have applied to them, so they will be sending you a tax bill plus penalties for failure to file. I'm assuming your talking USA. There are two ways to look. If you know you should pay on the cap gains, the best way to handle that separately from your salary is to file a quarterly tax payment.  That, I understand, is what the self-employed have to do. I'm in the situation where at some point, probably this year, the company that employs me will be bought out, and I will owe capital gains taxes on my shares gobbled up in the buy-out.  It's a cash-for-stock transaction.  So, in my case, I've just adjusted my W-4 to take advantage of the safe-harbor provision related to taxes I payed in 2016 and my salary.  The details vary depending on your situation, but in my case, I've calculated what it will take in W-4 allowances to make sure I pay 110% of my 2016 tax payment (after refund).  I'm not worrying about what the actual taxes on those shares of company stock will be, because I've met the rules for safe-harbor. Safe harbor just means that they can't penalize you for under-withholding or underpayment.  It doesn't mean I won't have to write a check on april 15. Although I am not a tax professional, and in this case you would be better off with a professional advice, my understanding (at least of Arizona, New York and California individual tax regulations that I've been dealing with) is that you only pay taxes in the state in which you're domiciled.  Lottery winnings are payed by States/State-run corporations and as such sourced to the State that pays it. Buying a ticket in SC links you to the lottery run in that State, even if you live in another. You'll be claiming your winnings in SC, not in NC, and the winnings will be sourced to SC, not NC. As such SC will be taxing them. NC will be taxing them as well, since you're NC resident. Federal income tax refunds received during 2016 are not taxable income for 2016 (or any other year) on either the Federal or the State tax return. The State income tax refund for 2015 received during 2016 is not taxable income on the State tax return for 2016. It is taxable income on the Federal tax return for 2016 only to the extent that you received a tax benefit (reduction in Federal income tax due) from deducting State income tax as an Itemized Deduction on your 2015 Federal return. If you didn't deduct State income tax because you deducted State sales tax instead, then the State income tax refund is not taxable income on the Federal tax return. Residents pay tax on all of the income they receive during the calendar year from all sources, so you'll at least need to file and pay New York state income taxes on this money regardless. I can't answer whether you'll need to file and pay Colorado state income tax on this money as well. Generally speaking, you need to file a return for each state in which you live, receive income, or have business interests. If you are required to file a Colorado state income tax return, however, you can claim a credit for taxes paid to another state on your New York state income tax return using form IT-112-R (see the form and instructions). For some reason I have a doubt that you have ever payed taxes in california.  Money has been injected into these areas. The fact that they need to be cut should be proof of that. You can't cut money that was never given.