Using taxation statistics, we estimate the income share held by top income groups in New Zealand over the period 1921-2002. We find that the income share of the richest fell during the 1930s, rose again after World War II, and steadily declined from the late-1950s until the mid-1980s. From the mid-1980s until the mid-1990s, top income shares rose rapidly. We also estimate shares-within-shares, and find that the income share of the super-rich as a share of the rich followed a similar trajectory, rising sharply over the past quarter-century. Throughout the twentieth century, top income shares in New Zealand followed a very similar pattern to top income shares in Australia. We speculate that the reduction in top marginal tax rates, the deregulation of the economy, and the internationalisation of the market for English-speaking CEOs may have contributed to the recent rise in top income shares.
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