The party said lowering the minimum threshold could mean an extra 10 to 15 companies would be eligible for the rebate.
But ports are surprised by the criticism.
How well-off or not will voters feel given economic threats?
Paul Goldsmith hedges his bets on tax cuts.
Will the bank be given a debt-to-income tool to manage household debt?
Is the government prepared for an economic storm?
Is the government all talk?
But will the methane target be changed to meet National's concerns?
What's the cost of 100% renewable electricity?
Grant Walker debates the week's political events with Peter Dunne and Brent Edwards.