Canadian in California - filing taxes as a non-resident
"What do you mean by ""Canadian income""? Was it income paid to you as wages for the job you did in the US? Or rental/interest income in Canada? If the former - then it doesn't go to NEC, it goes to the main part of the return. If the latter - it doesn't appear on your NR return at all. Yes, it is to validate your residency status. It has no other effect on your taxes."
Am I required to send form 1099 to non-US citizens who are not even residing in the US? Since they're not required to file US taxes, do I still have to send the form to them? That's tricky. You need to get W8/W9 from them, and act accordingly. You may need to withhold 30% (or different percentage, depending on tax treaty they claim on W8). If you withhold taxes, you also need to file form 1042. I suggest you talk to a tax professional. Is it fine to expose my ITIN (taxpayer identification number) to   individuals or companies who I send the form to them. Since the form   requires me to write my TIN/EIN, what would be the risks of this and   what precautions should be taken to avoid inappropriate/illegal use? No, it is not OK. But if you pay these people directly - you don't have much choice, so deal with it. Get a good insurance for identity theft, and don't transact with people you don't trust. One alternative would be to pay through a payment processor (Paypal or credit cards) - see your next question. I send payments via PayPal and wire transfer. Should I send form   1099-MISC or 1099-K? Paypal is a corporation, so you don't need to send 1099 to Paypal. Whatever Paypal sends to others - it will issue the appropriate forms. Similarly if you use a credit card for payment. When you send money through Paypal - you don't send money directly to your business counterparts. You send money to Paypal. how much taxes would I pay on my income from the rent they would pay me? The same as on any other income. California doesn't have any special taxes for rental/passive income. Bothe CA and the Federal tax laws do have special treatment, but it is for losses from rental. Income is considered unearned regular income and is taxed at regular brackets. Would I be able to deduct the cost of the mortgage from the rental income? The cost of mortgage, yes. I.e.: the interest you pay. Similarly you can deduct any other expense needed to maintain the property. This is assuming you're renting it out at FMV. If not, would I pay the ordinary income tax on that income? In particular, would I pay CA income tax on it, even though the property would be in WA? Yes. Don't know how WA taxes rental income, but since you are a California tax resident - you will definitely be taxed by California on this, as part of your worldwide income. I can't give you a specific answer because I'm not a tax accountant, so you should seek advice from a tax professional with experience relevant to your situation. This could be a complicated situation. That being said, one place you could start is the Canada Revenue Agency's statement on investment income, which contains this paragraph: Interest, foreign interest and dividend income, foreign income,   foreign non-business income, and certain other income are all amounts   you report on your return. They are usually shown on the following   slips: T5, T3, T5013, T5013A To avoid double taxation, Canada and the US almost certainly have a foreign tax treaty that ensures you are only taxed in your country of residence. I'm assuming you're a resident of Canada. Also, this page states that: If you received foreign interest or dividend income, you have to   report it in Canadian dollars. Use the Bank of Canada exchange rate   that was in effect on the day you received the income. If you received   the income at different times during the year, use the average annual   exchange rate. You should consult a tax professional. I'm not a tax professional, let alone one who specializes in the Canadian tax system. A professional is the only one you should trust to answer your question with 100% accuracy. "Although there are occasional cases where simply moving money between countries results in a tax liability - for example a ""non-domiciled"" UK resident using the ""remittance basis"" - this is not the case in your situation. In general it would be extremely rare for non-residents of a country to be taxed on bringing money into that country, as it would be bad for tourism which most countries want to encourage. The requirement to declare large sums of money on entry is primarily so that the authorities can detect money laundering, rather than tax. Note that you will have to pay US tax on any interest you earn on that US bank account." You can do that, you aren't missing anything. It is supposed to be punishment, but as you are moving to a European country your non-penalized income would likely be taxed higher as is. I don't have info on whether you will be taxed a second time by the European country. Eeeeeeh... No, you don't. In Canada, and pretty much any country with common sense they will rarely charge you for income made outside its borders. In the worst case scenario you're taxed on income deemed resulting from investment (stocks, bonds, etc.), but the general rule is... You don't pay taxes on income made abroad. Canada doesn't tax non-residents on income earned/incurred outside of Canada. So, your sister should start with this page to determine the residency status. If she is indeed determined to be non-resident - she should look here to see her obligations. If all she earns she earns outside of Canada - her obligations will be very little, if at all. This is similar to almost any other country in the world, with the notable exception of the United States of America. US citizens are taxed regardless of their residency status, everywhere in the world on worldwide income (unless tax treaty says otherwise). Do I need to declare it to IRS? The account? No. You do need to file a form W8-BEN with the bank though and make sure you maintain the correct information on it (it has your address there, so if you move - update it). Your account may be frozen until the form is provided, especially if it has activity on it. The 2-nd and 3-rd scenario would come as a result of some freelancing   activity done while I am out of the US (definitely would qualify for   Non-Resident Alien status). This you do have to report to the IRS. I'm guessing the payer is in the US, and would not know that you're a foreigner. In this case you're liable for taxes (if the payer knows you're a foreigner - they must withhold the taxes on your behalf). The payer will report payments to the IRS, so you have to submit your own tax return for a match. If there's activity on your account that might be suspicious, it will be reported to money laundering unit in the US Treasury Department, that may come after you through the treaties the US might have with your home country (tax treaty, extradition treaty, etc).