1. Yes, you file the tax return with your current address- where the IRS can contact you if they need to.
2. The UK Carer's Allowance is treated the same as it would be in the U.S. It seems that is is akin to the Medicaid Waiver payments, which is not taxable income in the U.S. so you would not have to report it.
3. Yes, you ay have to file a state tax return. You should also check the state requirements for changing your domicile.
4. You would file a 1040.
5. Since the UK does not require you to report worldwide income, you would not be required to file a return if your only income was the Carer Allowance- however, you may need to report the intertest income (depending on the amount you received while a UK resident).
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