‘Optional’ Cover Letter Is a Trap Word: The 35% Who Skip It Are Failing a Test They Didn’t Know They Took

Here’s a number that should make you nervous: 51.7% of recruiters don’t read cover letters, but only 22.9% of HR managers and 29.4% of HR heads skip them. That gap is the whole story (Novoresumé).

The reading rate climbs as you move up the org chart toward the person who actually decides. So when a job post says the cover letter is “optional,” it isn’t telling you it doesn’t matter. It’s telling you the first gatekeeper won’t read it, while the person signing off on your interview probably will. If you want to understand what a letter is even for, start with how a cover letter actually works.

The fault line runs between the screener and the decider

Most advice about cover letters treats “hiring people” as one blob. The data says that’s the mistake. The people who skip your letter and the people who decide your fate are often not the same person.

Recruiters live in volume. They’re the first pass, sorting hundreds of applications, and more than half of them admit they don’t read the letter. Hiring managers and HR heads sit closer to the decision, and their skip rates drop to the low 20s and high 20s.

• 51.7% of recruiters skip the letter. That’s the number people quote when they tell you cover letters are dead.
• 22.9% of HR managers skip it. Less than half the recruiter rate.
• 29.4% of HR heads skip it. Still far below the front-line screener.

Interview Guys Take: The “cover letters are dead” crowd is quoting the recruiter number and pretending it’s the whole funnel. It isn’t. The recruiter’s job is to reduce the pile, not to fall in love with your writing. The person who reads your letter is usually the one deciding whether to spend an hour of their day interviewing you, and that person skips it far less often. Optimizing for the screener while ignoring the decider is optimizing for the wrong reader.

“Optional” is doing quiet work in that sentence

The trap isn’t the word itself. It’s the assumption you bring to it. You read “optional” as “skippable.” The people reading applications read it very differently.

72% of hiring managers say they expect a cover letter even when the posting explicitly marks it optional (Resume Genius). And 77% of recruiters say they’d give preference to a candidate who included one when it wasn’t required (via Yahoo Finance).

• “Optional” filters for effort. Including a letter nobody forced you to write is a signal, and a decent chunk of hiring people read it as one.
• The word protects the company, not you. It keeps the posting compliant and low-friction while leaving the door open to reward the people who send one anyway.

What a good letter actually moves

Skeptics act like the letter is decorative. The numbers say it swings decisions in both directions.

49% of hiring managers say a strong cover letter can convince them to interview an otherwise weak candidate. And 18% say a weak letter can sink an otherwise strong one. It’s not a tiebreaker sitting on the shelf. It’s a live variable.

• 83% read letters submitted to them. Even when not explicitly required, most hiring managers frequently or always read what lands on their desk (Resume Genius, 625 U.S. hiring managers).
• Tailored beats generic by a wide margin. A controlled callback test clocked 16.4% for a tailored letter, 12.5% for a generic one, and 10.7% for none at all. More than two-thirds of the lift came from customization alone.
• 94% call cover letters influential. With one in four calling them “very important” when deciding who to interview.

Interview Guys Take: Look at that callback experiment again, because it quietly destroys the laziest version of this debate. A generic letter, the kind you paste in and change the company name on, moved callbacks from 10.7% to 12.5%. That’s almost noise. The real jump came from tailoring: 16.4%. So the honest read isn’t “always send a letter” or “never bother.” It’s that a phoned-in letter buys you almost nothing, and a specific one buys you a real edge. The effort is the entire product.

Most of your competition is opting out

Here’s where the trap gets almost unfair to the people who fall for it. The behavior is going the opposite direction from the data.

47% of job seekers only submit a cover letter if the posting explicitly asks, and 31% never use one at all (Novoresumé’s survey of 5,579 job seekers). Add those up and the majority of applicants are skipping a document that decision-makers still open.

• The crowd is fleeing the field. When most applicants skip the letter on an “optional” post, the few who submit a sharp one stand out by simple contrast.
• Scarcity is your friend here. A tailored letter matters more precisely because so few people are bothering to write one.

The skeptics aren’t wrong, they’re just not universal

We’re not going to pretend the case is airtight. There’s real data pushing the other way, and you should know where the thesis gets shaky.

ResumeBuilder’s 2024 survey of 948 hiring managers found only 26% always or frequently read cover letters, and 44% never read them at all (via JobCannon). That’s a far more brutal read than the Novoresumé or Resume Genius numbers.

• Volume breaks the system. At large tech, e-commerce, and banking employers, the ATS often collects the cover letter field without a single human opening it. There, “optional” is honest.
• Recruiter workload is exploding. JobCannon cites a 26% jump in recruiter workload in a single quarter. Screeners structurally can’t prioritize letters even when they’d like to.
• Context is everything. Company size, sector, and whether the hiring manager reviews applications directly (versus getting a filtered shortlist) change the answer completely.

Where the bet actually pays off

Put the two camps together and you don’t get contradiction. You get a map. The letter’s value isn’t fixed. It rises and falls with who’s reading and how many applications they’re drowning in.

The thesis holds strongest at mid-sized companies, for senior roles, and any time the hiring manager reads applications directly instead of receiving a pre-filtered pile. It weakens most at high-volume employers running everything through automated screening.

• Strong bet: mid-sized firm, specialized role, referral in hand, or a posting where a human decision-maker clearly reviews candidates. A referral makes it even stronger if you know how to reference it in the letter.
• Weak bet: mass-market posting at a giant employer where the ATS eats the field and the recruiter is triaging hundreds of applicants a day.
• The tiebreaker cases: career changers, overqualified candidates, and people with resume gaps get the most out of a letter because it’s the one place to explain the story the resume can’t.

Interview Guys Take: Here’s our honest position. The cover letter is not a universal requirement and anyone telling you it is hasn’t looked at the volume data. But treating “optional” as “skippable” is a lazy default that costs you nothing to fix and quietly screens you out of the exact roles where the decider still reads. When you can’t tell which situation you’re in, and you usually can’t, the asymmetry favors writing one. The downside of an unread letter is a wasted twenty minutes. The downside of a skipped one is never knowing you failed a test.

The version of the letter that’s worth sending

If the callback data teaches anything, it’s that a generic letter is barely worth the paper. So the play isn’t “write a letter.” It’s “write a specific one, or don’t bother.”

That means naming the role, naming a real problem the team is solving, and connecting your actual experience to it. If you’re switching fields, a career-change cover letter is where you control the narrative. If your resume outpaces the job, address it head-on instead of hoping nobody notices.

• Lead with skills, not history. A skills-first approach lands faster with a reader who’s giving you thirty seconds.
• Keep it tight. The three-paragraph formula exists because nobody reads a page and a half.
• Make the story consistent. Your resume, letter, and profile should tell one story. Handle the synchronization so a reader who checks all three sees the same candidate.

The word “optional” is doing exactly what it’s designed to do. It lowers the barrier for the company, satisfies the applicants who want an excuse to skip, and leaves the door open to quietly reward the people who read the situation correctly. The 51.7% recruiter skip rate is real, but so is the fact that the decision-maker’s skip rate is less than half of it.

So the question isn’t whether cover letters are dead. It’s whether you can tell which reader is on the other end, and when you can’t, whether you’re willing to lose the roles where a tailored letter still moves the needle. If you’re going to write one, make it specific enough to matter. Steal structure from real cover letter examples and make sure it reads like a professional making a case, not someone begging, which is its own avoidable trap.