Besieged former Labor MP Barry Urban is set to quit parliament, sparking a byelection in his seat of Darling Range.

Barry Urban's departure will trigger a byelection. Credit:AAP

A report into his handling over a fake medal scandal which erupted last year is expected to be handed down on Tuesday, but Mr Urban is set to quit first, the West Australian Newspaper reported.

The member for Darling Range had been taking time to seek counselling during the summer break after it was revealed he had worn a fake medal to an ANZAC Day service in 2017 and lied about his educational qualifications.

In the wake of the scandal, the 48-year-old resigned from the Labor party and became an independent.