Four in ten women in the UK feel nervous about the impact starting a family might have on their career a life choice often cited as a cause of the gender pension gap.
A report published today by PwC to mark International Women's Day reveals 44% of women worry how motherhood will affect their job, while 48% feel overlooked for promotions after starting a family.
In addition, over a third think taking advantage of work-life balance flexibility programmes has negative career consequences, with many not trusting what their employers tell them about career development.
This comes after previous research from Aegon found that women typically have half the retirement savings of men by the time they reach 50, with the gender pension gap found to dramatically widen with age.
The firm said an 8.9% gender pay gap, along with disrupted working patterns, make it particularly difficult to achieve pension equality, finding that 49% of women are not confident of having a comfortable retirement.
"It's shocking that 100 years after women secured the vote, we have a gender pay gap," Aegon head of pensions, Kate Smith, said. "The fact that the gap filters down to mean women receive lower pension incomes is a double blow.
"When you factor in that women's ability to save is further interrupted by breaks in their career to raise a family or care for elderly parents, the pension gap reaches epic proportions."
Aegon found that more than one in four women don't know how much they have saved, compared to just 9% of men, and that 42% have never thought about how much they will need in old age.
This is thought to be particularly pressing for women considering they live longer on average than men, meaning their retirement could often last longer and be more expensive.
It is also thought that the criteria for pension auto-enrolment makes it more difficult for women to save than men.
Under the current rules, those eligible for a workplace pension must earn at least £10,000 a year from a single job, however, women are more likely than men to have multiple part-time jobs.
"We know that more women than men don't meet the eligibility criteria with almost a third effectively being excluded from workplace pensions as they earn less than £10,000 a year," Smith said.
"Auto-enrolment doesn't allow for people with multiple jobs to combine their earnings and with women being more likely than men to have multiple jobs, this creates a problem for the future.
"This discrepancy will continue to fuel pension inequality unless changed."
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