Claims National should have spotted the four billion dollar mistake in their economic plan

Labour's finance spokesperson Grant Robertson revealed yesterday that National had miscalculated how much it could gain by suspending Super Fund contributions.

New Zealand Herald Wellington business editor Hamish Rutherford says the amount of money put into the Super Fund is dynamic - and was updated between May and September.

He says it happens twice a year, and while it may not always be as dramatic as this year's, National simply overlooked the change and had quite a large mistake in their alternative budget.