A mother’s employment earnings dip for up to 10 years after having a baby, research finds.

Researchers from the University of Queensland’s Life Course Centre used data from the Household Income and Labour Dynamics in Australia (HILDA) survey to investigate the impact of parenthood on earnings across a period spanning 10 years prior to and 10 years after the birth of a child.

Lead author Ruth Steinbring says that while previous research found an immediate “motherhood penalty” on women’s earnings, this study was one of the first to examine the long-term trajectory of household earnings through the transition into parenthood.

“We know that parenthood is a key contributor to loss of earnings for women, but we did not know whether or at what point women started to regain their lost earnings,” Steinbring says.

“While there is an expectation over the long term that couples will gradually return to pre-parenthood earnings arrangements, our study results do not support this. Parenthood affects men and women differently and the gender gap in earnings is still evident up to 10 years after the first birth.”

The study shows the share of households with male breadwinners rises sharply post-parenthood and has still not returned to pre-parenthood levels 10 years on.

It also shows a large decrease in the number of equal-earner households. However there is less fluctuation in the number of female-breadwinner households from pre- to post-parenthood.

Steinbring says it makes economic sense for the person who earned more to continue working.

“Our study confirms that parenthood entrenches the male-breadwinner model, but it also shows that there are some couples who make it work with a female breadwinner and we can learn from those households,” Steinbring says.

“Current policy mainly focuses on supporting women after the birth of a child, but our research suggests that improving women’s earnings prior to giving birth can also help improve equality.”

Coauthor and professor Janeen Baxter, director of the Life Course Centre, says the study provides valuable new insights into the role of parenthood in gender inequality over a lifetime.

Read the full article about women's earnings by Matt Macdermott at Futurity.