Prince Harry looks set to face heavy tax cuts in California, warns expert

The Sussexes are estimated to have a common value between £ 16m and £ 20m. The combined exposures of immovable property, mortgage repayments, staff, security and the £ 18,000 a month they reimburse the UK taxpayer for the refurbishment of Frogmore House in Windsor are enormous, and are estimated at up to £ 5 million to reach.

Their Santa Barbara estate was purchased through a shell company listed at the Los Angeles address by Meghan’s long-term business manager, Andrew Meyer.

No names have been added to the trust, but the same address was used by the Duchess when she set up her other businesses, Frim Fram and MM Global, which Mr McClure said could suggest they were concerned about the tax implications of any association with Prince Harry.

The type of visa he has traveled will be the key in determining his tax status.

It has been suggested that he is unlikely to apply for a Green Card or citizenship, which would require him to relinquish his titles and make him liable to tax on income worldwide, including trust in the UK.

Foreign nationals who marry an American and intend to reside in the U.S. must obtain a U.S. immigrant visa to become a legal permanent resident.

It is possible that Prince Harry used diplomatic status to enter the US, but given that he no longer works on behalf of the Royal Family, it is thought unlikely.

Another option could have been an 0-1 extraordinary ability visa, which he could have obtained with the support of high profile supporters and confidence in his unique status when setting up an event like the Invictus Games.

A spokesman for Prince Harry declined to comment, but said they would “follow the same legal requirements as anyone else.”