Glossary: RPI

Replaced as the official measure of inflation by the consumer prices index (CPI) in December 2003. Both the Retail Price Index and CPI are attempts to estimate inflation in the UK, but they come up with different values because there are slight differences in what goods and services they cover, and how they are calculated. Unlike the CPI, the RPI includes a measure of housing costs, such as mortgage interest payments, council tax, house depreciation and buildings insurance, so changes in the interest rates affect the RPI. If interest rates are cut, it will reduce mortgage interest payments, so the RPI will fall but not the CPI. The RPI is sometimes referred to as the “headline” rate of inflation and the CPI as the “underlying” rate.

Relevant to: Markets & economy

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