The High Court has ordered Irish actor Devon Murray and his parents to pay his former agent more than €260,000 in unpaid commission.
Mr Murray played the part of Seamus Finnigan in the Harry Potter series.
His former agent Neil Brooks claimed he was owed €286,000 in fees.
Today the High Court found their agency agreement was valid but ordered a 9% reduction in the amount being sought.
In court yesterday the Murrays said they had fired Mr Brooks due to a number of problems, including his unavailability during a publicity crisis.
They say they continued to pay him until the end of their agreement but should not have to pay him any more.
The actor told the court he had not worked since the Harry Potter movies and earns around €1,000 a month in residual payments from the films. He said he had to rent out his house and move back with his parents.
His mother told the court her son had once had a good income stream from the movies but had "gone out drinking, taken out girls and bought cars, because that is what teenage boys do".
Mr Brooks had denied their claims that he had been unavailable to them when needed. He said he was entitled to 20% of the actor's earnings from the movies, including ongoing residual payments.
Mr Justice Michael Moriarty also awarded costs against the Murray family.
He said he was sorry for the family. He said Devon Murray's career seemed like a marvellous one and he was sorry things did not work out with Mr Brooks who did so much to enhance things.
The judge also said he was sorry that some of the money, close to €1m, went on pursuits that "were not helpful".
Afterwards, Mr Murray said he was "gutted but there's not a lot we can do now."
He said his parents' health not been the best over the last few years and hopefully it does not take its toll.
He said there were a lot of things he put his money into, he bought horses which he thought was a good idea at the time and bought property "but the a**e fell out of that".
"It wasn't all women, cars and drink," he said.
He said he was "completely naive" when he entered the agreement with Mr Brooks. However he said he would never trade Harry Potter for the world.
He said he has found it very hard to get work since and he believes it may be due to the dispute with his former agent.
His mother said she was disappointed but the judge had made his decision and they would do their best to pay the money although she did not know how.
She did not see how an agreement lasting one year could stretch into ten years, she said.
His parents said they became concerned when payment cheques were being sent all around the world through their agent before reaching them and that was one of the reasons they terminated the agreement.
