During the 2011-2012 tax year, Grint received £4.5m from a company that managed his business, and of which he was the only shareholder.

This payment was described as being for “likely residual income and bonuses” resulting from the Harry Potter films.

He argued he could pay capital gains tax on it at a rate of 10% rather than income tax and national insurance at a top rate of 52%.

In the ruling, tribunal judge Harriet Morgan dismissed Grint’s appeal and said the money “derived substantially the whole of its value from the activities of Mr Grint”, which was “otherwise realised” as income.

He previously lost another, separate court case in 2019 that involved a £1m tax refund.

Grint appeared in all eight Harry Potter films from 2001 until 2011.

Since then, he has appeared in the films Into the White and Knock at the Cabin, and also appeared on TV and in theatre.

He has starred in Apple TV series Servant for the last four years.