In fact, based on the reported results of oil and gas companies operating in New Zealand, the 42 per cent combined royalty and tax rate estimated by the Ministry of Economic Development is too low. The 2010 financial results of one oil and gas company that holds an interest in a New Zealand oil field with no exploration outside the permit area reports an effective combined rate of around 45 per cent.
However, a company with an interest in the same permit area, but which has invested in exploration outside the permit area, has a much higher effective combined rate of around 65 per cent - a direct result of the difference in "profit" for financial reporting and royalty purposes.
In the year to June 30, 2010, the Government received $432 million from petroleum royalties. The Ministry of Economic Development has recently released a report valuing the Crowns' royalty stream from existing producing fields in New Zealand at between $3.2 billion and $5.5 billion over the remaining field life.
Like other industries, the oil and gas sector is required to pay corporate tax on all profits. Between 2004 and 2009, the industry paid around $1.4 billion in taxes.
In addition to corporate taxes, the oil and gas sector also contributes in the form of employee taxes such as pay as you earn tax and fringe benefit tax. This source of revenue is often overlooked, but it is a valuable and significant contribution to the economy.
Given the highly technical area of expertise, the industry attracts some of the top engineers and physicists from around the world for long-term projects - many of them remunerated at levels well above the average salary.
Although a number of the participants involved in oil and gas exploration are foreign-owned, it does not necessarily follow that all of the associated economic benefits are repatriated.
Oil and gas exploration and development companies require a number of support services - many of these contracts being captured by local providers.
These include professional and consulting services, environmental planning, design, transportation and seismic testing.
The industry also requires significant supporting infrastructure such as roads, transmission pipelines and port facilities. The Taranaki region illustrates the importance of the oil and gas industry to these local providers.
While these "indirect" contributions are harder to quantify, their value must not be overlooked.
What this means for New Zealand's future:
Oil and gas exploration presents an invaluable opportunity that should be grasped with both hands. A significant discovery would boost Government revenue through direct contributions to the tax base, and provide employment prospects and opportunities for local businesses to provide supporting services. With an ounce of luck we may follow in Norway's footsteps, which became the second wealthiest nation in the OECD in terms of GDP per capita after oil was discovered on the Norwegian continental shelf in 1969 (an increase from 19th). New Zealand, on the other hand, over the same period has fallen from eighth to 21st, a position we share with Greece.
John Pfahlert is executive officer of the Petroleum Exploration and Production Association.