The points advanced by the action group have considerable validity. If tax purity is the reason for this exercise, the impost should be applied throughout the country. An employee carpark, like other non-cash benefits such as petrol vouchers, is an advantage whether it is applied in Akaroa or Auckland. It is a perk for the car-driving workers of Whangarei as much as those of Wellington, and one denied those who get to work by bicycle, foot or public transport, even if the last of those modes is also subsidised.
The revenue this tax would gather, $17 million, is a drop in the public bucket. It could be justified only if there were no significant adverse consequences. Accountants Lock & Partners estimate the costs of gathering the carpark tax would be almost double the take. Then there is the damage that may be done to the city centres of Auckland and Wellington.
The capital has already been affected by the layoffs in government departments. Like Auckland, it also faces a struggle to retain businesses. Many small companies, in particular, are constantly assessing whether they would find it cheaper, and no handicap to their business, to move to suburban locations.
The potential damage does not end there.
The Unite union has warned that if nightshift employees lose their work carparks it would force them to walk to cars parked some distance away at unsafe hours.
Another factor that should be considered is the reaction of businesses that, according to the action group, will pay an extra $1500 a year for all on-premises carparks and close to $2400 a year for all commercially supplied places.
Some will either get rid of carparks or, perhaps more probably, recoup their cost through lower salary increases.
Given these drawbacks, it is unsurprising that even the Labour Party has voiced concerns. So has Small Business Minister and Act leader John Banks, who describes the tax as "petty". He, however, could yet be forced to vote for the change as part of his party's agreement with National to support confidence and supply bills.
It should not come to that. Opposition to the tax is widespread and well-founded. The Government sounds no more than lukewarm on the idea. It should drop it.