Very good questions indeed. I assume the plan is to report country C as the country of residence and tax residence, on the IRS report, which will be truth, and it's a good idea to always tell the truth to IRS
. Remember the story of Tinkoff, who got arrested in London for "under reporting" (his Russian stock in his own company in Russia) to IRS many years ago
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The only concern in this setup which I see is the tax office of country C. If they're meticulous and also have enough resources to enforce every single bit of their laws on any tourist/visitor/resident, then it might cause trouble eventually, but again - the trouble could be different in each jurisdiction, some will ask to pay the tax retroactively and send a bill to pay, some will add a fine and ask to pay, others could sentence to jail or whatnot, go figure
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I'd look into the local country C authorities to determine what's their tax rate and whether declaring US LLC is a must, and how bad of an offence it is to not declare something. If it's barely found in their laws and is for example vague in a way that could not be clearly understood at all, whether to declare or not, taxable or not, in which residency status, and what is a legal residency terms (does it make you resident after 183+ days etc'?) then they're probably as clumsy as to not even notice those ATM withdrawals etc'. But if it's an advanced country like Singapore, Hong Kong, China, Japan, Australia, Malaysia, then probably it's not worth risking it, for the small amount of 'savings' on local tax rates, since if local tax rate is fair and relatively low - the good sleep is totally worth it, since worrying about being caught and billed for all past years retroactively, will still exist subconsciously, and it won't be worth it IMHO. Best option is to go fully legal setup, but I also understand the fun part of tricking the system a bit using crypto, it's just kind of fun, and proves some point (to the one who uses it) about crypto being an anarchist tool to gain personal freedom of any states and laws etc'etc'etc', a fun ride, but better be careful. If the total monthly amounts are not in the tens of thousands or hundreds of thousands $, then worst case scenario (if ever happens) is probably a 'fine and a slap in the face' but not jail time. But still, I would go fully legal for a clean setup confirmed by CPAs/tax advisor/accountant. That's a personal choice for anyone. But I agree it is not very dangerous, the described idea of OP, unless he will have very large sums of money and large scale business. In this case I would say to not play with relying on crypto ATM cards and tourist visas. But small sums are not worth the time of tax authorities, since they have limited resource and of course will first go after the big fish.
Sorry for the long read, I'm kinda sleepy.. possibly rephrased and wrote the same thing twice