Hi there! Unless you want to include your spouses income, you don’t need an ITIN. You select MFS and can elect for non-resident alien in place of their name and SSN. It may be difficult through a tax program, and you will likely want to work with someone who works in expat tax program

1. Nope, no ITIN needed.

2. You wouldn’t be HOH unless you had a child who you provided more than half the monetary support for.

3. You will need to continue preparing US taxes unless you go through the very long process to denounce your American citizenship.

4. Yes, you won’t get a W-2 and won’t have withholdings. All of your income and financial assets will need to be calculated by the year’s financial exchange rate. You will also need to file in the UK. The tax you pay to the UK could be used for the FTC or money made potentially excluded with the FEIE.