What it means

A stated interest rate tells you how much the amount of money grows or what borrowing costs in pounds. A real interest rate allows for inflation, which reduces what each pound can buy. For a quick estimate, subtract inflation from the stated interest rate; the exact calculation is slightly different. For a loan or saving decision about the future, people use expected inflation, which may differ from what actually happens. Tax, fees and the particular prices you face can change your own result.

Example

Suppose £100 in savings earns 5% over a year, becoming £105, and the things you buy also cost 5% more. You have more pounds, but your savings buy the same amount as before, so the real return is 0% before tax and fees.

Why it matters

A positive interest rate can still leave a saver worse off in buying power if prices rise faster; borrowers also need to distinguish money payments from their inflation-adjusted cost.

Also known as

inflation-adjusted interest rate

Related terms

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