In many applicant tracking systems (ATS), a gap rule takes a minute to set. Choose a threshold, such as six months, and any resume with a longer stretch between jobs is rejected or buried. Our earlier post on how to read a resume gap covers how a human reviewer should interpret one. This post covers a different question: the setting that decides whether a reviewer sees the resume at all, and what the evidence supports.

What the Setting Does

The Harvard Business School and Accenture report Hidden Workers: Untapped Talent (September 2021) surveyed executives on how their recruiting systems filter. It found that "48% of employers filtered middle-skills candidates based on employment gaps of more than six months." The report describes the mechanism: "If an applicant's work history has a gap of more than six months, the resume is automatically screened out by their RMS or ATS, based on that consideration alone." (RMS stands for recruiting management system.)

The authors also note what such a rule cannot do: "Such filters obviously cannot infer what caused such a gap to occur; they simply express an absolute preference for candidates with no such gaps." They list reasons that fall inside the rule, including "a difficult pregnancy, the illness of a spouse or dependent, personal, physical, or mental health needs, or relocation due to a new posting of a military spouse." For the wider survey, see our overview of how ATS filtering creates hidden workers.

Why Employers Set It

The report explains the logic behind the rule: "Our research indicated that employers believe applicants with more recent experience are more likely to have better professional skills." Recency matters in some roles, such as those that depend on a current certification or fast-changing tools. A date gap is a blunt way to test for it, because it also removes people whose skills stayed current through study, part-time work, or unpaid caregiving. A direct test of the skill the role needs is more precise and easier to defend.

What Callback Studies Show

The gap rule rests on an assumption that time out of work signals risk. Field experiments test that assumption, with limits.

Kroft, Lange, and Notowidigdo (Quarterly Journal of Economics, 2013) sent about 12,000 fictitious resumes to real job postings in the 100 largest metropolitan areas, across administrative, customer service, and sales jobs. As summarized by the Abdul Latif Jameel Poverty Action Lab, "callbacks were about 45 percent lower than at one month of unemployment" at eight months of unemployment. The same summary reports that beyond eight months, additional time out of the workforce did not continue to reduce callback rates.

Eriksson and Rooth (American Economic Review, 2014) ran a field experiment in Sweden. Their abstract reports that long unemployment spells in the past did not matter for hiring decisions, "suggesting that subsequent work experience eliminate this negative signal." Employers did "attach a negative value to contemporary unemployment spells lasting at least nine months."

Three cautions apply. Both studies measure unemployment spells, which are not identical to every kind of gap. They measure what employers did, not what predicts performance. And one was run in Sweden. Read together, they suggest the penalty attaches to recent, long spells and fades once someone has worked again. A rule written as "any gap over six months, anywhere in the history" is broader than that pattern.

Who the Rule Reaches

The Hidden Workers reasons point to caregiving and health. Platform data is consistent with caregiving as a common reason for breaks. LinkedIn's Economic Graph Research Institute reported on November 6, 2024: "Globally, 33.6% of women list a full-time parenting career break compared to 7.3% of men."

That figure has a listing caveat. LinkedIn launched its Career Breaks profile feature in March 2022, and the analysis is restricted to members who listed a career break on their profiles as of June 2, 2024. LinkedIn notes that its data is influenced by how members choose to use the platform. The figure describes members who chose to list a break and specify its type. It does not describe all workers, and it does not measure how many resumes a gap filter removed.

The Legal Question for Counsel

A gap rule applies to everyone equally on its face. Whether it creates legal exposure depends on facts this post cannot assess, so it is a question to put to employment counsel. Two questions belong on the list. First, does the rule remove some protected groups at noticeably higher rates than others? Our audit checklist shows how to measure that. Second, is the rule applied in a way that reflects assumptions about caregivers?

On the second point, the U.S. Equal Employment Opportunity Commission issued guidance on May 23, 2007, on workers with caregiving responsibilities. It states: "Employment decisions based on such stereotypes violate the federal antidiscrimination statutes." The guidance concerns disparate treatment, where a decision rests on stereotypes. Whether a neutral gap threshold raises a separate issue is the kind of question counsel can answer.

What to Do With the Setting

Find out whether it is on. Ask your ATS administrator which rules reject or hide candidates automatically, and what threshold each uses.

Change automatic rejection to a flag. A gap can be noted for a reviewer without removing the resume from the queue.

Tie any remaining rule to the job. If a role requires current certification or recent hands-on work, test that requirement directly instead of using a date gap as a stand-in.

Measure the effect. Count how many applicants the rule removed in the last quarter and how many were later found qualified when sampled.

Move the question to the interview. A direct question about the period resolves most gaps and keeps the decision with a person.

How TrueScan HR Helps

TrueScan HR scores a resume against the job description and shows the matched and missing skills, so a gap in dates does not decide the outcome by itself. The narrative assessment explains each score in plain language, which gives a reviewer the substance to weigh before deciding what a gap means. Veteran Mode translates military codes, duties, and clearances into civilian skills, so a transition period does not hide recent, relevant experience. The reviewer makes the decision.

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