Women aged 18 to 24 are most likely to earn more than their significant other, with 25% of UK households in this age category having a female breadwinner.
For ladies aged between 35 and 54, the percentage drops to 21%, which is still higher than the national average of 20%.
Women over the age of 55 are least likely to earn more than their partners, with just 16% of households seeing a female bring in the highest salary.
Some 22% of households see each partner bring home a similar income, while half of households have a male breadwinner, according to insurer LV=, which compiled the data.
Women who earn more than their partners are more likely to say they feel the pressure to maintain a regular income than their male peers, according to the research. Some 43% of female breadwinners say they feel very aware of their financial commitments and how important it is for them to stay in work, compared to 34% of men.
Bucking the trend
Myles Rix, managing director of protection at LV=, said: "With an increasing number of households where the woman earns more than her partner, it's clear to see that younger generations are bucking this trend.
"While it is great to see that women who earn more than their partners are proud of their career achievements, the flipside of this is that they are feeling stressed about their financial responsibilities."
Famous women who out-earn their partner include model Kate Moss, actress and TV presenter Oprah Winfrey, singer Adele, and actress Julia Roberts.