This is due to worries about the amount of money that would be raised if affluent foreigners were to just leave the UK.

A person who resides in the UK but whose permanent residence, or domicile, is outside the country is referred to as a "non-dom".

Although Treasury officials have not presented any precise strategy to the OBR throughout the Budget process, they do admit that eliminating two concessions from the previous administration may not generate the £1 billion they had anticipated, if any money at all.

The Labour platform sets aside £1 billion for school breakfast clubs, additional hospital and dental visits, and other expenses.

The problem is in the concessions given when former chancellor Jeremy Hunt abruptly ended the non-dom scheme. These were intended to lessen the inducement to relocate for rich foreigners who had permanent residence overseas.

Approximately 50% of the funds earned under the broader abolition plan were already expected to be lost due to behavioural modifications.

The OBR declared in March that the money generated was extremely unclear.

For example, even adjustments to emigration estimates might result in relatively little being raised by the extra tightening of the plan that is intended.

Non-Dom: What is it?

Although these characteristics may have an impact, non-dom refers to a person's tax status and has nothing to do with their citizenship, nationality, or residency status.

Only earnings made in the UK are subject to UK taxation for non-doms. They are exempt from paying tax to the UK government on earnings earned abroad (as long as they don't receive the funds in a UK bank account).

If affluent individuals declare a lower-taxing nation as their domicile, this offers them a substantial - and fully legal - savings potential.

(Sources: bbc.co.uk)