Is there a legally mandated filing fee and/or deposit?
New Zealand
NewZealand Electoral Act 1993 (2010), Part 8 –Election petitions, p. 347
232 Securityfor costs
(1) At the timeof presenting an election petition or within 3 days
after theexpiration of the time limited for the presentation of
the petition,the petitioner shall give security to the satisfaction
of theRegistrar of the court for all costs that may become
payable by thepetitioner to any witness summoned on the petitioner’s
behalf or toany respondent.
(2) Thesecurity shall be an amount of $1,000, and shall be given
by recognisanceto the Crown entered into by any number of
sureties notexceeding 5 or by a deposit of money, or partly in
one way andpartly in the other.
(3) If nosecurity is given as required by this section, no further
proceedingsshall be taken on the petition.
http://aceproject.org/ero-en/regions/pacific/NZ/new-zealand-electoral-act-2010/view