Great question. A US income tax return for 2019 is required to be filed with the IRS by US taxpayers if worldwide income and gains exceed just $5 (!) (married filing separately), $400 (self-employed), $12,200 (single) or $24,400 (married filing jointly). If needed, a US income tax return for 2019 is due to be filed by 15 June 2020; but might easily be extended until 15 December 2020 by filing an IRS Form 4868 by 15 June 2020 - followed by writing a letter to the IRS by 15 October 2020. An FBAR for 2019 must, however, if needed be filed with the US Treasury by 15 October 2020