If you owe UK tax, you might think that leaving the UK makes it difficult to collect. Maybe, but the USA seems to be prepared to collect tax on behalf of other countries for their citizens sheltering in the USA.
While most tax treaties contain provisions for resolving issues of double taxation and for sharing of information by the respective treaty partners, only a few tax treaties contain provisions that provide for the collection of taxes by the treaty partners. These tax collection provisions are more likely to be found in newer tax treaties—such as the U.S.-Danish treaty, which was ratified in 1999. But even where there are tax collection provisions in the treaties, it’s been relatively unheard of for one treaty partner to seek to collect the taxes of the other treaty partner. Dileng may suggest more tax collection cooperation with our treaty partners in the future.