Couples who marry before first child 50% less likely to split

By Leonardo Blair, Senior Reporter Wednesday, June 17, 2026

Couples who marry before conceiving their first child are 50% less likely to break up than those who conceive outside of wedlock, findings of a new study show.

The study, titled The timing of marriage and risk of union dissolution among first time parents in the UK, by Harry Benson, research director of the Marriage Foundation in the United Kingdom, was published last month.

Benson analyzed data on 3,324 couples and tracked their children born in the early 2000s until their 14th birthday. He found a significant “marriage effect” regardless of socioeconomic background, race, religion, education, region, and several other control variables.

The risk of breakup was highest for cohabiting couples during the first three years of parenthood, at about 4.1% per year, compared with 2.5% for married parents. Benson found that the stability gap in families narrows when children start school, then widens significantly when the children turn 14. The probability of separation grew to 45% for never-married couples, compared with just 26% for married parents.

Benson’s findings further challenge studies from the Institute for Fiscal Studies that have been used by the U.K. government to guide public policy for more than two decades, by suggesting that married parents stay together longer only because they are “older, better educated, and better off.”

“The benefits of marriage have been systematically underestimated in academic research and public policy. … Their [the IFS] conclusions rest on a major methodological flaw: analyzing only three quarters of parents in their survey sample,” Benson notes in his study. “My analysis of the entire sample, using improved state-of-the-art methodology, shows that marriage accounts for more than half of the gap in union dissolution. In short, being married substantially increases the chances that parents stay together, regardless of when marriage occurs and regardless of socio-economic background.”

Marriage, the study argues, is the primary driver of family stability.

“These findings are consistent with well-established psychological theories that have been largely neglected in sociological research. Commitment theory, cognitive consistency theory, and signal theory all suggest that marriage functions as a commitment device, reinforcing dedication, aligning behavior with long-term intentions, and increasing the costs of exit,” Benson states. “The results also align closely with the long-term shift away from marriage and the rise in family instability.”

Benson further notes that the U.K. government contributes to the breakdown of families by treating cohabitation as an equivalent to marriage.

He urged the U.K. government to promote the psychological benefits and the stabilizing role of marriage in social messaging, especially around early parenthood. Other suggestions include creating incentives for low- and middle-income families to marry and conducting future research among unmarried couples to explore commitment and outcomes.

 “This groundbreaking study categorically demonstrates the benefits of marrying and blows apart decades of government policy that has consistently downgraded marriage to just another form of relationship like cohabiting,” Benson said in a statement on the study. “It also serves as a rebuke to those politicians who have sneered at the institution and have, through their actions, actively discouraged marriage among the poorest couples with punitive welfare policies and a lack of courage to promote marriage for fear of being seen as old-fashioned or judgmental.”