Money from a NZ First-linked slush fund was reportedly spent for campaign purposes and kept secret from party officials and MPs.
It's claimed $38,000 of money donated to the New Zealand First Foundation went toward NZ First's campaign headquarters. Financial records seen by Stuff show the money covered expenses such as rent, furniture, swipe cards and the purchase of a shredder - with none of the spending declared to the Electoral Commission.
Invoices showed $325,000 was spent by the foundation in the 18 months to March this year, most of it directly benefiting NZ First, according to Stuff.
It follows revelations yesterday that the NZ First Foundation appeared to have hidden almost $500,000 in political donations, which were not disclosed to the Electoral Commission.
Law experts say if the allegations are proven the party and foundation may have fallen foul of electoral law.