Tax structures are measured by the share of major taxes in total tax revenue. While, on average, tax levels have generally been rising, the share of main taxes in total revenues – the tax structure or tax “mix” – has been remarkably stable over time. Nevertheless, several trends have emerged up to 2014 (the latest year for which data is available for all 35 OECD countries). (Table 1.3)
Taxes on incomes and profits
- On average, OECD countries collected 33.7% of their tax revenues through taxes on income and profits (personal and corporate income taxes taken together) (Table 3.8). Taxes on personal and corporate incomes remain the most important source of revenues used to finance public spending in sixteen OECD countries, and in nine of them - Australia, Canada, Denmark, Iceland, Ireland, New Zealand, Norway, Switzerland and the United States - the share of income taxes in the tax mix exceeds 40%. (Table 3.6)
- Revenues from personal income taxes are 24% of total taxes on average in 2014 compared with around 30% in the 1980s (Table 3.10). About two percentage points of this reduction can be attributed to the impact on the average of a number of relatively new entrants to the OECD from Eastern Europe for which tax revenue data is only available from the 1990s onwards. These countries tend to have relatively low personal income tax revenues and high revenues from social security contributions, but this impact is observed on the post 1990 data only.
- The variation in the share of the personal income tax between countries is considerable. In 2014, it ranged from a low of 7% and 10% in Chile and the Slovak Republic, respectively, to 41% in Australia and 54% in Denmark. (Table 3.10)
- The sharp fall in the share of revenues from corporate income taxes in total taxation in 2008 and 2009 did not continue into 2011 and 2012, but the share of these taxes in total revenues remains, at 9% in 2014, below its 11% share in 2007. (Table 3.12)
- The share of the corporate income tax in total tax revenues shows a considerable spread, from around 4% (Finland, Hungary and Slovenia) to 17% (Norway) and 21% (Chile). Apart from the spread in statutory rates of the corporate income tax, these differences are at least partly explained by institutional factors or the exploitation of mineral deposits, for example:
- the degree to which firms in a country are incorporated,
- taxation of oil revenues,
- the erosion of the corporate income tax base, for example as a consequence of generous depreciation schemes and,
- other instruments to postpone the taxation of earned profits.
Social security contributions
- Social security contributions as a share of total tax revenues were 26% in 2014.They were highest in the Czech Republic and the Slovak Republic (43-44%). In contrast, Australia and New Zealand do not have social security contributions (Table 3.14). OECD countries also show a wide variety in the relative proportions of social security contributions paid by employees and employers (Tables 3.16 and 3.18).
- Between 1965 and 2014, the share of taxes on property fell from 8% to 6% of total tax revenues on average.
- In relative terms, property taxes have a share exceeding 10% of total tax revenue - in five countries (Australia, Canada, Korea, the United Kingdom and the United States) (Table 3.22).
- The share of taxes on consumption (general consumption taxes plus specific consumption taxes) fell from 36% to 31% between 1965 and 2014 (Table 3.26).
- During this period, the composition of taxes on goods and services has fundamentally changed.A fast-growing revenue source has been general consumption taxes, especially the value-added tax (VAT) which is now found in thirty-four of the thirty-five OECD countries.
- General consumption taxes presently produce 21% of total tax revenue, compared with only 12% in the mid-1960s (Table 3.28).
- In fact, the substantially increased importance of the value-added tax has served to counteract the diminishing share of specific consumption taxes, such as excises and custom duties.
◊ between 1965 and 2014, the share of specific taxes on consumption (mostly on tobacco, alcoholic drinks and fuels, including some newly introduced environmentrelated taxes) was more than halved;
◊ rates of taxes on imported goods were considerably reduced everywhere, reflecting a global trend to remove trade barriers;
◊ nevertheless, countries such as Estonia (around 14%), Slovenia (around 15%) and Turkey (around 22%) still collect a relatively large part of their tax revenues by way of taxes on specific goods and services. (Table 3.30)
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