Former “Harry Potter” film actor Rupert Grint faces a $2.3 million bill after he lost a legal battle with the tax authorities.

Grint, who played Ron Weasley in the magical film franchise, was ordered to pay the money in 2019 after H.M. Revenue and Customs, the U.K. tax agency, investigated his tax return from seven years earlier.

The agency said Grint had wrongly classed $5.7 million in residuals from the movies — money from DVD sales, TV syndication, streaming rights and other sources…