You may wonder why U.S. citizens pay taxes on income earned abroad. U.S. taxes are based on citizenship, not country of residence. That means it doesn't matter where you call home, if you're considered a U.S. citizen, you have a tax obligation.
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The US is one of the few countries that taxes its citizens on their worldwide income, regardless of where they live or earn their income. This means that American expats are potentially subject to double taxation - once by the country where they earn their income, and again by the United States.
As long as you pay tax on your wages in your home country, you will not have to pay tax in the UK. You must file a Self Assessment tax return, together with a completed SA109 form. Use the 'other information' section of your SA109 to include: the dates you were stuck in the UK because of coronavirus.
The tax law is found in Title 26 of the United States Code. Section 6012 of the Code makes clear that only individuals whose income falls below a specified level do not have to file returns. While our tax system is based on self-assessment and reporting, compliance with tax laws is mandatory.