"Optional" Cover Letters Aren't Really Optional — What Hiring Managers Actually Expect

If you've stared at a job posting that says "cover letter optional" and wondered whether that's a real option or a trap, you're not imagining the ambiguity. The data on cover letters is genuinely mixed, and most of what gets written about it picks one number and ignores the rest.

The reach numbers don't agree, and that's worth sitting with

One survey found 26% of hiring managers read cover letters regularly, with 44% skipping them entirely. A different survey found the opposite pattern: 83% read them, and only 4% never do. Those aren't rounding-error differences — they're describing different worlds.

The likely explanation isn't that one survey is wrong. It's that "hiring manager" isn't one job. Reach also splits by function: roughly 39% of recruiters doing an initial screen skip the cover letter, compared to about 23% of the people making a final decision. The person in an early-stage triage seat, moving fast through a stack of applications, treats it as optional in practice. The person deciding between two or three finalists is more likely to actually read it. If you don't know which stage you're at, you don't know which number applies to you — which is itself the reason to default to writing one.

What "optional" tends to mean in practice

About 72% of hiring managers say they still expect a cover letter even when the listing marks it optional. That's the number that matters more than the reach split above: "optional" on a job posting is often a formality, not a genuine signal that submitting without one carries no cost. Read literally, it means "not required to apply." Read practically, for a meaningful share of the people evaluating your application, it means "we noticed you didn't."

Generic vs. personalized isn't a small gap

This is the part that actually changes what you should do with the time you have. A personalized cover letter is associated with roughly a 53% lift in callbacks; a generic one — swapped company name, same boilerplate paragraph — only around 17%. That's not "a cover letter helps a little." That's the difference between a cover letter doing real work and a cover letter doing almost nothing, and the variable isn't whether you wrote one, it's whether it's specific to the role.

There's a version of this that shows up on the resume side too, separately: 83% of HR professionals say a strong cover letter can help secure an interview even when the resume alone isn't quite strong enough. A generic one doesn't get credit for that — it reads as filler because it is filler.

The practical rule

Skip the "is it optional" question entirely and ask a different one: do I have anything specific to say about this role that isn't already on my resume? If yes — why this team, a detail about the posting that maps to something you've actually done, a gap you want to address directly — write a short one. If you don't have anything specific, a generic cover letter is closer to noise than help, and your time is probably better spent tailoring the resume itself more precisely.

That's the same principle behind how we built JobSeekersHub: your tailored resume is generated from your verified work history, not invented enthusiasm for the occasion, and a cover letter built the same way — from facts you've actually confirmed, matched to what a specific posting is asking for — does more than one built from a template with the blanks filled in. $24.99 per job, one time, up to 10 revisions. The writing is only worth the effort if it's specific. Otherwise it's better spent elsewhere.