If you are a US citizen working abroad, you are required to file a US income tax return with the IRS. You must file even if you have no income in the US.
An expatriate is an individual, who has left their country of origin in order to reside or work for a specified or unspecified period of time in another country.
There are some tax provisions that may help to low the tax burden:
The Foreign Earned Income Exclusion allows you to exclude up to $106,700 of your 2020 foreign earned income.
A foreign tax credit is used when you pay tax to a foreign government. That tax is then taken into account when preparing a US tax declaration.
Foreign Housing Exclusion allows a deduction from income if a US person* paid for household expenses during the living abroad.
Important Filing Requirements:
Penalties for not filing the above forms are severe.
*US Persons: https://www.law.cornell.edu/uscode/text/22/6010#:~:text=%E2%80%9CUnited%20States%20person%E2%80%9D%20defined,-U.S.%20Code&text=As%20used%20in%20this%20chapter,laws%20of%20the%20United%20States.