Things aren't getting any easier for Mr Sunak.
The Independent reports that he and his wife were officially permanent US residents while he was Chancellor.
Rishi Sunak and his wife were legally declared to be "permanent US residents" while he was chancellor of the UK, it has been reported.
The claim comes after The Independent revealed that the Chancellor's spouse Akhshata Murty has non-domiciled status despite residing in Downing Street – potentially letting her off the hook for around £4.4 million in tax.
Now Sky News reports claims that the Downing Street couple held US "green cards" permitting them residence in the United States until more than a year into his chancellorship.
Holders of the green card are required to file US tax returns on their worldwide income – and also to make a legal commitment to "make the US your permanent home".
The pledge would seemingly be at odds with Mr Sunak's position as Chancellor of the United Kingdom, being a member of parliament since 2015 and minister since 2018, and the fact he lives on Downing Street.