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Tax rates and allowances are different in Scotland so these figures only apply to residents of England, Wales and Northern Ireland.

The calculator uses Consumer Price Index (CPI) inflation data from the Office for National Statistics from 1998 onward. Monthly calculations of the current year are based on the latest CPI level, whereas previous years use their calendar year averages. CPI estimates before 1988

CPI estimated before 1998 are modelled on data collected for the Retail Price Index (RPI).

The calculator uses the Consumer Price Index (CPI) as this is the measure used by the Government to set the Bank of England’s target for inflation. An alternative credible measure, which is the ONS’s lead measure of inflation, is the Consumer Price Index including Owner Occupiers’ Housing Costs (CPIH).