Do I Need a Cover Letter? A One-Minute Decision Guide
Do you need a cover letter? Send one when the posting asks for it or calls it optional, and skip it only when the posting says not to or the form has no place for one. This is our judgement, not a measured rule: we found no independent study showing that a letter changes who gets hired.
Decision table: send one or not
Find your situation, read the row. This table is our own judgement, not data. The "why" column is our reasoning, informed by the career-center advice quoted further down.
| Situation | Send one? | Why |
|---|---|---|
| Posting says required | Yes | An application without it can be dropped as incomplete. |
| Posting says optional | Yes, if you can make it specific | A tailored letter is a free chance to explain fit. A generic one adds nothing, so skip it before sending that. |
| Posting says nothing | Yes, short | Silence is not a ban. If the form accepts a file, a short specific letter costs little. |
| Posting says do not send one | No | Follow the instruction. Sending it shows you did not read the posting. |
| The form has no upload field | No, unless you can add it | Do not force it into a resume or an unrelated text box. Put your best two sentences in a "why this role" or notes field if one exists. |
| Applying by email | Yes, as the email body | The message itself works as the letter. Keep it short and put the role title in the subject line. |
| Referral | Yes, short, and name the referrer | The referral opens the door, and a few lines say why you fit the role. |
| Career change or a gap to explain | Yes | The resume cannot explain why you moved fields or paused. Two or three sentences can. |
What the evidence measures
The surveys we found are self-reported opinions from firms that sell resume or hiring products, and the one experiment is the resume-writing company's own, with no sign of peer review on its page. Nothing we opened is independent and compares applicants with and without a letter. Every page below was read on 2026-11-12.
| Source | What it measured | Who, when, sample | Limits |
|---|---|---|---|
| ResumeGo, "Cover Letters: Just How Important Are They?" (field experiment) | Interview callbacks within 30 days for no letter, generic letter, tailored letter | 7,287 fictitious applications to job boards "such as ZipRecruiter, Glassdoor, and Indeed," July 15, 2019 to January 10, 2020, split into no letter, generic letter and tailored letter. Tailored letters had "a 53% higher callback rate than applications with no cover letter at all" | The company's own experiment, run by a firm that sells resume writing services; we found no sign it was peer-reviewed. The callback figures per group appear only in a chart, not in text, and the page states no limitations. Fictitious applicants, 2019-2020 |
| ResumeGo, same page (survey) | Whether recruiters read letters | ResumeGo's own survey of 236 recruiters and hiring managers, date and recruitment not stated on the page. "The overwhelming majority (87%) of hiring professionals do read cover letters" | Opinion survey, same commercial interest |
| Resume Genius, "cover letter statistics" | Reading habits and influence on interviews | Resume Genius's own survey of 625 US hiring managers through Pollfish. The page gives two years, 2022 in one place and 2023 in another, and was updated January 20, 2026 | Opinion survey by a resume and cover letter tool vendor. The page links a GitHub dataset, which we did not check |
| iHire, article by its CEO in HR Daily Advisor | Importance and reading of letters | iHire's own survey, which the article calls the "Value of a Cover Letter Survey": "603 U.S. hiring managers and recruiters from 56 different industries." Article by iHire's President and CEO, published 2021-03-11. Survey dates and how respondents were recruited are not stated on that page | Opinion survey by a job board. The press release itself returned an access error, so we used the CEO's article |
Read the figures with those limits in mind.
Do hiring managers read them?
Self-reported, mostly yes. In Resume Genius's own survey, "83% of hiring managers read the majority of cover letters they receive," and "even at companies that don't require cover letters, 73% of hiring managers read them anyway" (Resume Genius). In iHire's own survey, "10.6% of hiring professionals surveyed said they do not bother to read cover letters" (HR Daily Advisor). These measure what people say they do, not what they did with your application.
A much lower readership figure is commonly repeated online, attributed to a 2024 ResumeBuilder survey. We could not find the original, so we do not use it. Whether recruiters and the managers who own the job read letters at different rates: Unknown, we found no measured split.
Do letters change outcomes?
Unknown for independent evidence. The only experiment we found, ResumeGo's, reports that tailored letters had a 53% higher callback rate than no letter (ResumeGo). It is the company's own experiment, not shown to be peer-reviewed, by a firm with a stake in the answer, it used fictitious applicants, and it is from 2019 and 2020. Treat it as a signal, not proof.
A survey claim points the same way: Resume Genius's own survey reports that "49% say a strong cover letter can convince them to interview an otherwise weak candidate" (Resume Genius). That is what managers say they would do.
One academic paper looks at letters but not at this question. Abbas Nejad, Musillo, Wicker and Zaccaria, "Labor Market Signals: The Role of Large Language Models" (listed as forthcoming in the Journal of Labor Economics, author page dated May 2025), ran two field experiments on how large language models change the letters job seekers send. They report that "these gains do not boost interview invitations" (author page). The abstract we read compares AI-assisted with human-written letters and does not mention a comparison with sending no letter, so it does not answer whether you need one.
Do employers expect one when it is optional?
iHire reports that "one in three hiring managers surveyed said they still expect to receive a cover letter" "even when their job posting specifies it is optional" (HR Daily Advisor). This is iHire's own opinion survey (a job board), reported in a 2021 article. How many postings are required, optional or silent: Unknown.
What career centers advise
University career centers give advice, not evidence, and most say to send one:
- UMBC: "even when a letter is not required, you should consider writing one," with one exception, when "the job listing states specifically not to include a cover letter" (UMBC Career Center).
- University of Wisconsin-Madison School of Education: "Even if the application says the cover letter is optional, it's a good idea to write one and submit it" (Career Center).
- George Mason University is more conditional: "If optional or not mentioned, include one only if it adds meaningful, tailored information and is carefully proofread" (Career Services).
The pages show no publication date. The George Mason line is the one our table follows for a generic letter.
Steps when it is optional and you are short of time
When the letter is optional and the clock is running, write a short one, not none. This is our recommendation.
- Open the posting and pick the one requirement that matches your strongest piece of experience.
- Write three or four sentences: the role, that one match with a concrete result or project, and one line on why this company.
- Leave out anything your resume already says in the same words.
- Read it once against the posting. If a sentence would fit any employer, cut it.
Our guide on how long a cover letter should be gives the length range, and how to write a cover letter walks through a full one. The list of what to include covers the content of each paragraph.
When skipping is reasonable
Skip it when the posting says not to, when the form has no field for it, or when the only version you can write in your time is generic. A generic letter does not earn its minutes, and George Mason's advice above sets the same bar. Skipping is also reasonable for a referral where the referrer is submitting you directly and a message from you carries the same information. What skipping costs you is Unknown: no source we read measures it for optional postings.
Mistakes to avoid
- Sending a letter when the posting says not to.
- Pasting the same letter into every optional application. The ResumeGo result above is for tailored letters against none, not generic ones.
- Treating survey percentages as odds. They describe what respondents say, not your chance.
- Adding a letter to a form that has no field, by stuffing it into the resume.
Sources
All pages read on 2026-11-12.
- ResumeGo, "Cover Letters: Just How Important Are They?": https://resumego.net/research/cover-letters
- Resume Genius, "cover letter statistics" (page updated 2026-01-20): https://resumegenius.com/blog/cover-letter-help/cover-letter-statistics
- HR Daily Advisor, article by Steve Flook, iHire, on the iHire cover letter survey (2021-03-11): https://hrdailyadvisor.hci.org/?p=73217
- Abbas Nejad, Musillo, Wicker, Zaccaria, "Labor Market Signals: The Role of Large Language Models" (author page): https://giuseppemusillo.github.io/publications/chatgpt/
- UMBC Career Center, "Cover Letters": https://careers.umbc.edu/students/documents/coverletter/
- University of Wisconsin-Madison School of Education Career Center, "Writing a Cover Letter": https://careercenter.education.wisc.edu/prepare-apply/cover-letter/
- George Mason University Career Services, "Write Cover Letters and More": https://careers.gmu.edu/cover-letters
Disclosure
coverletterdesk.com is published by the makers of AIHawk, a job application tool. The About page gives details.
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