If you are a U.S. citizen the rules for filing income, estate, and gift tax returns and paying estimated tax are the same whether you are in the United States or abroad. Your worldwide income is subject to U.S. income tax, regardless of where you reside. If you have gross income from worldwide sources that are at least the amount shown for your filing status, you must file a tax return. (Foreign Income: you must convert your foreign currency into US dollars).
https://www.irs.gov/individuals/international-taxpayers/us-citizens-and-resident-aliens-abroad-filin...
If you receive a refund or no, depend on many factors: your filing status, income, withholding. In general U.S. citizens and resident aliens from the United States living or working in a foreign country are allowed the same deductions as U.S. citizens and residents from the U.S. living in the United States. Also, if you pay taxes in a foreign country, you might be entitled to receive the Foreign tax credit.
https://www.irs.gov/individuals/international-taxpayers/foreign-tax-credit
If you moved to a new home in 2017 because of your job or business, you may be able to deduct the expenses of your move. Generally, to be deductible, the moving expenses must have been paid or incurred in connection with starting work at a new job location. See Pub. 521 for a complete discussion of the deduction for moving expenses and information about moves within the United States.
https://www.irs.gov/pub/irs-pdf/p521.pdf
More information you will find in Tax Guide for U.S. Citizens and Resident Aliens Abroad
https://www.irs.gov/publications/p54
If you are a U.S. citizen or legal permanent resident (green card holder) living outside the United States, please register with the State Department’s Office of American Citizens Services and provide them with your most current contact information (local address and phone number, email address, etc.) and update them as frequently as necessary. This will help them contact you about the delivery of any refund check that may not include your correct mailing address.
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