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In January, the former mayoral candidate pleaded guilty to four representative charges covering 12 years of offending and $1,757,147 of unpaid taxes.
Heart of the City - a city-centre business association registered by Swney in 1994 - has income-tax exemption on the basis that it was created to develop or increase amenities for the Auckland public.
But technically the defendant was a contractor of the organisation as the sole director of AGS Services Ltd and the services he provided were taxable.
The IRD charges come with a maximum penalty of five years imprisonment and/or a fine of up to $50,000, and almost from the outset, the SFO said it was also investigating Swney.
A summary of facts filed by the IRD alleged Swney had issued "various fictitious invoices" to Heart of the City.
Investigators questioned several organisations - including the New Zealand Herald - over the authenticity of the invoices and determined they were created "without authorisation".
Swney is also facing civil action launched by Heart of the City, whose board announced the move in December after forensic accountants scoured their finances.
Both parties opposed applications to view documents.
In January, the defendant's lawyer Murray Gibson said they hoped to have all criminal matters dealt with at one sentencing date at the end of the month.
"It's in the best interests of everyone that all matters get resolved at the same time," he said.
"The indications are encouraging."