... OTC cash would be flagged by the bank in no time, correct?
Especially after a few years and with such an electric bill.
Registering the business overseas legally would be interesting as mentioned above, but not fully sure how it would be beneficial on this type of setup since the methods explained would not affect taxable income or tax rate to my knowledge.
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If it's your first business, then definitely try to keep it simple and don't overdo it with unnecessary foreign bank accounts and registrations. It's counterproductive and suspicious as hell.
If you intend to mine from US - register in US. If there's few people involved, start a simple partnership company (LLC?), if you're not familiar with it, get some business formation service agents involved to guide you through it.
Go to your local bank, ask for business account options, have a chat with manager, explain honestly what type of business you intend to start and whether there's a risk of bank flagging such operations. If the monthly costs are cheap, or none, open accounts with 2 different banks, just in case.
When you have your company registered + active bank account, then proceed to open accounts on 2-3 major btc/fiat exchanges that allow corporate customers - it costs nothing to open such account and you can just test which one is best for you.
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Renting excess space at shipping and freight storage buildings are a great deal for starting up a mining operation just an FYI I learned.
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Just make sure 1- you'll have an easy access to your miners, if something goes wrong, 2- facility management are aware of the heat/noise your miners will be generating, 3- get the legal terms agreed (insurance, liability).
...If you are doing everything by the books, you can then also write off the electricity and miners on your taxable income, making the effective rate 25-45% less or an easy 0.05/kwh
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You can write-off pretty much every costs and pay tax only on the actual profit, but I don't see how does that make electricity effectively 24-25% cheaper. It doesn't.