Father-of-two Roger Durrell, 64, from Horley,employed Eastern European women to entertain clients in the rented £300,000 house at Low-field Heath.
He charged customers £60-£100 for services advertised in newspapers before police raided the brothel, called Little Dell, in April last year.
In an interview he told officers he used a workshop at the house to repair vehicles and sublet the house to students, but was unaware it was being used as a brothel.
Durrell, of Poveycross Road, later admitted managing a brothel and was jailed for a year in February.
He returned to Lewes Crown Court on Friday August 4 for a 10-minute confiscation hearing, ahead of his imminent release.
Stephen Shay, prosecuting, told the court: "The bottom line is that it has been agreed a confiscation order should be made £18,158.16.
"But there is a dispute between the prosecution and the defence about the benefit the defendant obtained from his criminal conduct.
"The prosecution say the figure he benefited from is £322,797 and the burden is on the defendant to displace that figure."
Waylen Barnaby, defending, told the court Durrell was unable to show how much he earned as a car trader following the death of his accountant.
He added that his only assets were a number of old cars and a half share in his matrimonial home.
Judge Cedric Joseph ordered Durrell to pay back £18,158 of the £322,797 he made from his criminal activity.
He told him: "If that sum is not satisfied in full within the next six months you will go back to prison."