New data from the IRD shows that the share of taxable income going to the richest New Zealanders has not changed under National. However, that share is still very large, indicating significant income imbalances.

The IRD data shows that the richest tenth of taxpayers got one-third of all taxable income in both 2008 and 2014. Within that, the richest 1%, about 34,000 people, got over 8% of taxable income.

In contrast, the poorest tenth got just 0.4%.

The income shares are broadly the same in 2014 as they were in 2008. This would suggest that pre-tax inequality has not increased under National. However, the following must be taken into account:

• taxes and welfare payments make a big difference to final levels of post-tax or disposable income inequality, which is the most important measure, and that appears to be rising under National; and
• these figures exclude capital gains, which are not reported to the IRD because they are not taxed, and so the figures – in all likelihood – dramatically underestimate the amounts and shares of income going to the richest New Zealanders.

The graph below has more detail. The poorest tenth is decile 1 and the richest decile 10. The 1% are labelled as such.

Tax paid

The table below shows the share of income tax paid by the different deciles. It shows those shares have been stable 2008-14. The shares of tax paid by the richest 10% and 1% are large, as would be expected in a system in which they earn a disproportionately large share of income and taxes are modestly progressive (increasing with income). (The apparent change in shares for deciles 3-6 are largely an artefact of the calculation method and probably not significant.)

However, it is important to note that these figures are for income tax only, and do not include GST for instance, so they exaggerate the share of total tax paid by the richest New Zealanders. It is incorrect to say that the richest tenth pay 45% of all taxes.

The stability of tax paid seems surprising, given that the 2010 tax changes cut rates for the richest New Zealanders most dramatically. However, moves to crack down on tax avoidance, such as through loss-attributing qualifying companies, may have had some effect on the richest New Zealanders.

How much does it take to be in the 10%?

The table below shows how much you need to earn, pre-tax, to be in each decile or tenth of taxpayers. The top of decile 5, which is the middle of New Zealand, earns $28,000. To be in the richest tenth you need to have more than the top of decile 9, which is $81,000. To be in the richest 1% you need at least $205,000 a year.

Sources

These figures come from the IRD and can be found at http://www.ird.govt.nz/aboutir/external-stats/revenue-refunds/income-distrib-individual-customers/income-distrib-individ-customers.html.

I thank CTU economist Bill Rosenberg for checking my calculations (and for doing the earlier work that inspired this piece of analysis), although any mistakes remain my responsibility. The 2014 data are provisional at this stage, though any changes are extremely unlikely to alter the high-level figures quoted above.