Vector is in a High Court dispute with Inland Revenue about whether $53 million the electricity company received from Transpower is taxable.
The IRD's position is the payments are taxable, Vector's position is that they are not, the power company's lawyer Lindsay McKay said in the High Court at Auckland this morning.
Vector, which has already paid the disputed tax amount, is pursuing court proceedings to have the IRD reimburse the money.
The payments at issues were made by Transpower to Vector in an engineering electricity project, McKay said.
This was an upgrade by Transpower, the state-owned enterprise which owns and operates the national electricity grid, which saw it install cabling between Penrose and Albany substations in Auckland.