Hello and thank you for using Just Answer,If you use a relative's address you will be subjecting yourself to taxation in the state listed on that address. You would be required to prove to that state, should they assess tax on the income, that you are not a resident. The states, depending on which one, are very determined when a taxpayer uses an address in their state.
Florida doesn't have state income tax, but I imagine if I were to put a US address on the W9 form that it could get me in heaps of trouble with the IRS, whether it's a Florida address or any other state.
Not the IRS, because you are required to file and report your income to the federal anyway. You can use the Foreign Income Exclusion or the Foreign Tax Credit but you are still required to report the income if you are a US citizen or Green Card Holder.
If you are not a US person then YES, the IRS would determine taht you are under the taxation of the US should you use a US address.
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Okay, so I would be safe if I used a Florida address, since they do not have state income tax. I do file a US tax return every year and use the foreign tax credit thing.
Yes, and thanks for responding