To avoid the appearance of sex discrimination that would violate Title VII of the Civil Rights Act, Equal Employment Opportunity Commission (EEOC) guidance coupled with a common misunderstanding of the law have resulted in little or no information about family status being provided in pre‐employment interviews. To investigate whether concealing family information actually improves women’s employment prospects, we conducted an original experimental study fielded on more than 3000 subjects. Our study provides the first ever evidence that concealing personal information lowers female applicants’ hiring prospects. Subjects overwhelmingly preferred to hire candidates who provided personal or family information, regardless of content—any explanation improved employment prospects relative to no explanation for an otherwise identical job candidate. Our results are consistent with the behavioral economics theory of ambiguity aversion, which finds that individuals prefer known risks over unknown risks. These findings have broader implications regarding permissible pre‐employment questions, as they suggest that restrictions on questions about matters such as criminal history and credit history, both of which are currently targeted by legislatures and by the EEOC for prohibition, may likewise have adverse effects on the classes of workers such restrictions are intended to protect. Finally, our findings suggest that the interactive process model of reasonable accommodation, embodied in the enforcement guidance for the Americans with Disabilities Act, may provide a better model for accommodation of work–family balance.