Act Party leader John Banks opened a trust account to fundraise for his legal defence against a private prosecution, new records show.
The annual returns for the register of pecuniary interests was published this afternoon, detailing MPs trusts, property, gifts and other personal interests for the last year.
The register showed Mr Banks had opened a trust called Special Donations Account.
It was used to collect donations for his legal fight against accountant Graham McCready, who accused him of falsely declaring donations during his 2010 mayoral campaign.
A spokesman said the trust contained "less than $100,000".