Is there a legally mandated filing fee and/or deposit?
Australia
Answer
Yes, deposit
Source
Electoral Act1918 (2007), Part 22 Court of Disputed Returns, p. 395
356 Deposit assecurity for costs
When filing thepetition, the petitioner must deposit with the Chief
Executive andPrincipal Registrar, the Senior Registrar, or a
DeputyRegistrar, of the High Court $500 as security for costs.
Comment
Not specified when it comes to filing fee.