Your bank might be worried, but if you use a 'reputable' exchange that does KYC/AML, e.g. GDAX or Gemini, it should be alright. You might want to space out the

Your bank might be worried, but if you use a 'reputable' exchange that does KYC/AML, e.g. GDAX or Gemini, it should be alright. You might want to space out the bank transfers. As for the tax man, declare the capital gains and you'll be right as rain.