Read: What women want - when it comes to money
A couple of factors could explain those smaller contribution amounts, said Craig Copeland, an EBRI senior research associate. Some married women may make joint IRA contributions with their spouses, and those accounts may be under their husband's name, he said.
But the most likely reason, he said, is not surprising: Women make less on average than men. Women earned about 77 cents for every dollar earned by men in 2012, according to the latest data from the Census Bureau. That was unchanged from the year before and not much higher than the 61 cents women made for every dollar earned by men in 1960.
See the Employee Benefit Research Institute report here:
The wage gap, however, is smaller than the nearly 40 per cent divide in retirement savings balances between men and women, hinting that there is something else at play. Some women may be limited in how much they can put away for retirement because of other financial responsibilities, such as single mothers delaying retirement savings to cover child-care costs and some women deciding they would rather set aside money for a home.
Investing habits may also play a role in determining why women have smaller balances overall, but there isn't enough evidence on gender-based investing preferences in retirement accounts to show decisively that women are more conservative than men, Copeland said. Some studies show that women can be as aggressive with their investments as men of similar means, he said.
A look at asset allocations in IRAs in 2011 showed that men and women made nearly identical appropriations in bonds, stocks and cash. But women had more money allocated to balanced funds, which invest in both stocks and bonds, while men were more likely to invest in other asset classes.
What makes the savings gap especially troublesome is that women generally need more savings than men to cover health-care expenses, because they tend to live longer.
Life expectancy could partly explain a shift that happens in later years, Copeland said. In 2012, men made bigger average contributions to IRAs for all age groups except savers over 70, when the average contribution of $4,644 made by women topped the average of $4,632 by men. That change could be a sign that women are more able than men to work in old age, he said.
Still, Copeland said, he is optimistic that women can catch up. "I would think, as women continue to become a larger percentage of the labour force and have higher incomes, that you would expect that this gender difference would go away," he said.
- Washington Post