Do Cover Letters Still Matter? The Data Says It's Complicated

83% of hiring managers read cover letters. 94% say they influence interview decisions. And yet: only 35% of candidates submit one when it is listed as optional. That gap between what hiring managers value and what job seekers actually do is one of the most persistent disconnects in the modern job search.

The cover letter debate generates strong opinions but rarely cites data. One camp says they are essential. The other says they are relics. Neither camp usually mentions that ATS systems do not keyword-match cover letters, that 45% of hiring managers read the cover letter before the resume, or that a weak cover letter hurts more than no cover letter helps.

Do cover letters still matter? The answer is genuinely complicated. This is not a "how to write" guide. It is a "whether and when" guide - backed by data.

What hiring managers actually say

The numbers come from Resume Genius's survey of hiring managers (2025), cross-referenced with industry compilations from Resume.io and The Interview Guys' systematic analysis of 80+ cover letter studies.

83% of hiring managers read the majority of cover letters they receive. 45% always read them. 38% usually read them. At companies that do not require cover letters, 73% of hiring managers still read them. And 45% of managers read the cover letter before the resume - making it the actual first impression, not the supplementary document most candidates treat it as.

The impact on decisions is significant: 94% of hiring managers say cover letters influence their interview decisions. 49% say a strong cover letter can secure an interview even with a weaker resume. 82% say a strong cover letter can persuade them to interview an otherwise weak candidate (Resume.io, 2025). 77% of recruiters give preference to candidates who submit cover letters even when optional.

The flip side: 18% say a weak cover letter can sink an otherwise strong candidate. The risk is asymmetric. A good cover letter lifts you. A bad one actively damages you.

The ATS reality check

Here is where the conventional debate misses the point.

ATS systems primarily parse and keyword-match resumes, not cover letters (Jobscan, 2025). ATS extracts structured data from resumes - contact details, work experience, education, skills, keywords - and uses that data to filter candidates. Cover letters are collected and stored, but they are not typically keyword-matched.

The practical implication: your cover letter will not help you pass the automated gate. Your resume does that work. The cover letter influences the human reviewer who sees your application after ATS filtering.

This two-stage process changes the calculation entirely. If your resume does not pass the ATS filter, no one reads the cover letter. If your resume does pass, the cover letter becomes your primary differentiator - because most ATS systems produce a ranked list of qualified candidates, and the human reviewer needs a reason to choose you over the other names on that list.

When cover letters matter most

The data draws clear lines.

Company size is a factor. 72% of medium-sized businesses and 69% of large businesses require cover letters, compared to 49% of small businesses. Large and medium companies are also 2x more likely to rate cover letters as "very important." If you are targeting a company with more than 50 employees, assume the cover letter will be read.

"Optional" does not mean optional. 72% of hiring managers expect a cover letter even when it is listed as optional (Resume Genius, 2025). Only 35% of candidates submit one when it is optional. The math favors submitting: the vast majority of managers want it, and the vast majority of competitors skip it.

Personalization is the threshold. 72% of hiring managers instantly reject generic cover letters. Across 80+ studies analyzed by The Interview Guys (2024-2025), personalized, company-specific cover letters outperformed generic templates by a significant margin. The most effective format: identifying a company challenge, showing you understand it, and presenting yourself as the solution.

A generic, template-based cover letter is worse than no cover letter at all. This is the finding that reconciles the two camps: cover letters matter when they are personalized. They do not matter - and may hurt - when they are generic.

When to skip the cover letter

The data also identifies scenarios where cover letters provide little value.

When the application explicitly says "resume only." Follow the instruction. Submitting unsolicited materials signals that you do not read directions.

When the ATS has no cover letter upload field. If the application system does not have a field for it, the system cannot process it. Do not paste a cover letter into a notes field or email it separately unless specifically invited to.

When you are running a volume strategy. At 100-200+ applications per offer - the typical range in the current market - writing a personalized, research-backed cover letter for every application is not feasible. A quality cover letter takes 30-60 minutes of research and writing. That investment produces returns only for targeted applications. The time cost of each application is already significant; adding 45 minutes of cover letter work must be a deliberate allocation.

When the letter would be generic. If you cannot say something specific about the company or the role - something that demonstrates you researched beyond the listing itself - a generic letter adds no information. It tells the hiring manager you have a template. That is not a positive signal.

The decision framework

The strategic approach combines everything above into a simple hierarchy.

Tier 1: High-investment applications (always write a cover letter). These are your top 20-30 targets - high-credibility listings in roles you are strongly qualified for, at companies you have researched. Career changers explaining a pivot. Applications where you have a specific connection to the company or hiring manager. Required-cover-letter postings at medium or large companies.

Tier 2: Standard applications (conditional). If the posting says "optional" and you can write something specific in 20-30 minutes, write it. If you cannot personalize meaningfully, submit without.

Tier 3: Volume applications (skip the cover letter). Lower-credibility listings, roles where you meet minimum qualifications but are one of many, applications submitted primarily to maintain pipeline momentum. Your resume alone must do the work here.

The connection to the broader intelligence framework: use listing credibility to decide where to invest your time. The job search is an intelligence problem, not a volume problem. Cover letters are an investment - and like all investments, the return depends on where you put them.

What the data really says

Do cover letters matter? 83% of hiring managers read them. 94% say they influence decisions. But the research also shows that generic letters hurt, ATS does not keyword-match them, and the time investment only pays off for personalized, targeted applications.

The simple truth: cover letters are powerful when deployed strategically and worthless - or worse - when deployed indiscriminately. The question is not "should I write cover letters?" It is "which applications deserve one?"

JobIntel's credibility scoring helps answer that question. High-credibility listings are the ones where your investment in a personalized cover letter is most likely to pay off. Low-credibility listings are where your resume alone should do the work.

Allocate your effort where the data says it matters.

Try JobIntel free at jobintel.com. See which listings are real before you apply.