Britain’s government said on Monday it will cost on average about 169,000 pounds ($215,035) to deport each asylum seeker to Rwanda in the first detailed assessment of a high-stakes promise to tackle record numbers of people arriving in small boats.

Prime Minister Rishi Sunak’s government wants to send thousands of migrants more than 4,000 miles (6,400 km) away to Rwanda as part of a deal with the central African country agreed last year.

The government sees the plan as central to deterring asylum seekers arriving in small boats from France. Sunak has made this one of his five priorities amid pressure from some of his own Conservative lawmakers and the public to resolve the issue.

In an economic impact assessment published on Monday, the government said the cost of deporting each individual to Rwanda would include an average 105,000 pound payment to Rwanda for hosting each asylum seeker, 22,000 pounds for the flight and escorting, and 18,000 pounds for processing and legal costs.

Home Secretary (interior minister) Suella Braverman said these costs must be considered alongside the impact of deterring others trying to reach Britain and the rising cost of housing asylum seekers.

Unless action is taken, Braverman said that the cost of housing asylum seekers will rise to 11 billion pounds a year, up from about 3.6 billion pounds currently.

“The economic impact assessment clearly shows that doing nothing is not an option,” she said.

On Thursday, the Court of Appeal will hand down its judgment on whether the flights are lawful.

The first planned flight to Rwanda last June was blocked by a last-minute ruling by the European Court of Human Rights, which imposed an injunction preventing any deportations until the conclusion of legal action in Britain.

In December, the High Court in London ruled the policy was lawful, but that decision is being challenged by asylum seekers from countries including Syria, Sudan, Iraq, Iran and Vietnam along with some human rights organisations.

Last year, a record 45,000 people came to Britain in small boats across the Channel, mainly from France. Over 11,000 have arrived so far this year.