A single person will need ?31,300 a year for a moderate income in retirement, according to a pensions industry body.
The rising cost of living and an expectation to offer financial support to grandchildren had pushed up the income required by ?8,000, it said.
The Pensions and Lifetime Savings Association (PLSA) uses evidence from focus groups to make the estimates.
It is intended as a guide for those planning their retirement savings.
The calculations are pitched at three different levels - minimum, moderate and comfortable - and are developed and maintained independently by the Centre for Research in Social Policy at Loughborough University.
They estimated that a single person needed ?14,400 a year for a minimum income, and ?43,100 a year for a comfortable retirement.
Couples required a joint ?22,400 at the minimum level, ?43,100 at a moderate level, and ?59,000 at a comfortable level.
cont
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