Mr Simson today said Affco union members paid $5.95 a week each to the union, which totalled more than $500,000 a year.
"Affco workers represent less than 10 per cent of the 23,000 members the union says it has and yet it only declares revenue of just over $700,000 per annum,'' he said.
"More and more of our staff are starting to question where their money has gone. With the union now asking the public for donations, every workers' dollar must be accounted for.''
But union national secretary Dave Eastlake accused Affco of wasting money on a "publicity stunt complaint that has already be found to be without substance to detract attention from their brutal lock out of Affco workers and families''.
The New Zealand Institute of Chartered Accountants had already investigated a similar complaint and advised no action would be taken, Mr Eastlake said.
He was confident the union's finances were in order and said all branches accounts were audited annually.
"It is disingenuous for Talley's Affco to try and suggest there is money missing from the union's national account when they know we audit our four branches separately from our national account, which is a common legal practice,'' he said.
"We are concerned, but not surprised, that Talley's Affco chose to start their latest smear campaign the day before we go to mediation.''
The union was an independent society funded entirely by weekly donations from it members, which increased from 7000 to 22,000 members during the peak season.
Each of the four branches set their own fees, and each paid a "capitation fee'' to fund the national union, which was set at $51 per member, for the annualised membership of each branch.
A Serious Fraud Office spokeswoman confirmed the complaint had been received and said it would go through a 20-day evaluation period. After that it would be decided whether the complaint was taken further.