Again, IANAL, and I&#x27;m Canadian with a US bank account but yet to &quot;do business&quot; in the US (just having an expense account does not qualify in most&#x2F;all jurisdictions): Having a US phone number does not make you a US resident -- but having a US bank account means proving to the IRS and your bank that they should not withhold any taxes on your personal account. Having a US phone number does not in any way on its own require you to fill out IRS forms. Having a bank account does because your assets could be frozen, hence W8 and W9. Having a company in the US means potential tax returns, because now you&#x27;re officially doing business federally and also at a state level for your company. Even then, you are NOT a US resident personally, unless you physically reside within the US more than X% of the year. There are also many different tax treaties under which your W8 forms can provide exemptions, though some declarations might still require annual filing to declare you&#x27;re not a resident, or pay taxes on dividends. Your US company is considered a US person, however.