Note: Average marginal tax rate calculations exclude the impact of ACC levies, the Benefit system and the Family Tax Credit (FTC) system which, at various times since the 1970s, involved lump sum transfers to lower income families with children that were withdrawn at higher income levels at rates of up to 30c/$, thereby adding to effective MTRs.
Comment: The average marginal tax rate has been pretty stable in New Zealand since about 1990 excepting for a drop in the late 1990s and then an increase in 1999.
via http://www.treasury.govt.nz/publications/research-policy/wp/2012/12-04
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