90/10 income inequality ratio

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The Institute of Fiscal Studies – Living standards, poverty and inequality in the UK: 2020 (workbook)



  • The 90/10 income inequality ratio represents how many times larger income at the 90th percentile is compared with income at the 10th percentile. The chart shows the 90/10 income inequality ratio in calendar years between 1961 and 1992, and in financial years from 1993-94 to 2018/19.
  • All statistics are based on the Institute of Fiscal Studies (IFS) calculations using the Family Expenditure Survey (FES) (1961 to 1993 inclusive) and the Family Resources Survey (FRS) thereafter (1994-95 to 2018-19).
  • Incomes are measured net of direct taxes and benefits, before housing costs have been deducted, and equivalised using the modified OECD equivalence scale.
  • Figures relate to Great Britain households.

For further detail on methodology access the full IFS report