A ST Annes man applied for Jobseeker Allowance even though he was working at the time.
Jamie Bowman, 24, of The Hamlet, admitted failing to notify the Department of Work and Pensions about his work at a Lytham restaurant.
The court heard the defendant sometimes earned up to £232 a week.
Michael Woosnam, prosecuting for the department, said Bowman’s claim had been false from when it first came in and he had ended up being overpaid £443.99 in benefits.
Hugh Pond, defending, said his client had been told he could work up to 15 hours a week without affecting his benefit.
However, this was a figure which would not be confirmed by the DWP.
Magistrates fined Bowman £100 and ordered him to pay £380 towards the cost of the legal process.