Do cover letters still matter, and when do they actually get read?

Half the advice online says nobody reads cover letters. The other half says never apply without one. Both are describing real reviewers. The useful question is which reviewer you are writing to, and what a letter can do that a resume cannot.

What does the evidence say?

The largest public test I know of is a field experiment by ResumeGo, a resume writing company, which sent 7,287 applications to real postings between July 2019 and January 2020. Applications with no cover letter drew a 10.7% callback rate. A generic letter raised it to 12.5%. A letter tailored to the job raised it to 16.4%, about 53% more callbacks than no letter at all.

Read that honestly. It is one study, run by a company that sells writing services, and it predates widespread AI drafting. But the shape is the point: nearly all of the value is in the tailoring. A generic letter is mostly wasted effort.

When does a cover letter actually get read?

From the HR side of the desk, I read the letter closely when the resume raises a question it cannot answer:

• A career change, where the titles do not match the posting.
• A gap, a relocation or a step down in title.
• An unusual mix of credentials that could read as range or as overqualification.
• A small company, where the hiring manager reads everything.
• A close call between two finalists.

So what: the letter is your one chance to frame the resume before the reviewer frames it for you. If nothing on your resume needs framing, a short letter is enough. If something does, the letter is doing the most important work in the package.

How did the case study use the cover letter?

In the internal case study on this site, the candidate’s profile needed framing: rare credentials that could read either way, and a background that carries a measured penalty in callbacks. The written standard put the cover letter on page one and the resume on pages two and three, in one PDF, so the reviewer met the frame before the record. The letter ran 330 to 400 words and opened with a structural observation about the employer’s business, not with the candidate. Every package got one. The first interview invite came 15 hours after the first package under that standard was built.

What should the letter say?

• Open with the employer: a specific observation about its business or the problem the role exists to solve.
• Connect one or two of your results directly to that problem.
• Answer the question your resume raises before the reader asks it.
• Close by naming the conversation you want.

Skip the resume summary, the adjectives and the line about how excited you are. Write in your own voice; you should not have to code-switch on paper to be taken seriously.

When can you skip it?

When the application has no place for one, when the posting says not to send one, or when a referral has already framed you and the recruiter asked only for a resume. Otherwise, a tailored letter is the cheapest edge left in the process, because most applicants will not write one. If time is why you skip it, that is a system problem: under the case study’s standard, a full tailored package took about 10 minutes.

What should employers take from this?

If you ask for a cover letter, read it, and score it against the job’s criteria like any other evidence. If you will not read it, stop asking for it; it costs candidates time and costs you applicants. Structured interview scorecards put the letter, the resume and the interview on the same written criteria.

The letter gets you the conversation. The number you accept at the end of it compounds for a career: what taking the first offer costs.

McKinley holds a J.D. but is not a licensed attorney. Articles here are general information, not legal advice. For your specific situation, talk with an employment attorney.

Data current as of September 2026. Sources are linked where each figure appears.