Women retiring this year will get £7,424 less pension than men, Prudential research reveals.
The life and pensions provider showed women planning to retire this year expected to receive an average annual pension of £12,169, while for men the average figure was £19,593.
It says this meant the pensions income gender gap has widened by £782 since 2009 when the difference between men's and women's pensions was £6,642.
Figures from the Prudential Class of 2010 retirement survey - of 6,073 UK over-45s - also showed women's pensions had fallen 11% since last year. In 2009 women expected to collect an average annual pension of £13,671 - compared to £12,169 this year.
Men's pensions had also fallen this year by 3.5%. In 2009 men expected an annual pension of £20,313 - compared to £19,593 this year.
The mean expected pension income for men and women was down from £17,779 in 2009 to £16,509 this year - a fall of £1270, which equates to about £100 a month.
Prudential director of pensions and annuities Karin Brown says the reason women appear to get less in their pensions than men is, to a certain extent, because some take a career break to have children.
She adds: "By talking to your employer you can find ways of boosting pension savings and maximising the tax advantages that pension savings can bring."
The survey also highlighted the average annual pension for those retiring this year varied by £5000 depending on area. Those living in the South East expected the highest annual income at £19,275 and people in the South West expected the lowest at just £13,871.
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