Yes you would need to pay interest on any tax not paid from April 15, 2020 to June 15, 2020. There is a box on Form 4868 Extension to file indicating that you are out of the country and a US citizen. You need to check the box. There is a statement in TurboTax that will be attached to your return to get the automatic extension. In the search box enter extension, filing, additional and click the Jump to link. Click yes you want an extension and then on the next screen click that you want to prepare and out of country extension.
How To Get The Extension
To use this automatic 2-month extension, you must attach a statement to your return explaining which of the two situations listed earlier qualified you for the extension.
US Citizens and Resident Aliens Abroad - Automatic 2 Month Extension of Time to File
No, only US business days cause US source income, not vacation. Did your employer pay your rent? If so, that gets added to your income.
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