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I hold a law degree, with concentration in Tax Law, Estate law & Corporate law, an MBA, with specialization in financial accounting & tax, a BBA, and CFP & CRPS designations, as well - I’ve been providing financial, Social Security/Medicare, estate, corporate, non-profit, and tax advice, for clients on three continents since 1986…
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If you are a US Citizen, the, as you likely know, all of your worldwide income is taxable, regardless of where you are.
If you are not a citizen (if you pass the substantial presence test, by being in the US for 180 days) then you are still considered a US TAX resident an all worldwide income is taxed.
If you are not a citizen, and did not become a TAX resident, by passing the substantial presence test, then you will file a different tax form (1040NR), NR standing for non-resident, and only be taxed on the income that you received while IN the US.
Any time your are present in the US, then the income you generate from your business is considered "US source Income."
You may want to look at this chart, as it relates to whether your income (as a non-resident) is US or Foreign Source income.