According to a 2011 judgment, Inland Revenue had accused Sabatini and an associate of promoting a tax avoidance arrangement.
According to the latest decision, Sabatini had described the conduct of Inland Revenue as "disgraceful" and as "unacceptable and repugnant intrusions into the judicial function".
She said that the assessment of the amount she owed was issued in bad faith and claimed that the figures were "merely plucked out of the air".
She said that she did have proceedings in the High Court to challenge the assessments, but these were abandoned because she could not afford to continue.
According to the decision, Sabatini's debt is comprised of $11.7m in late payment penalties and interest, a promoter penalty of $6.3m, interest of $255,000, and a further $110,000 unpaid income tax.