Summary
Most cover letters are about enthusiasm, and only 9% of recruiters want to read about a candidate's motivation. The letter exists to answer two things a resume cannot: why this role, and why you. The method that works is mechanical rather than literary — take the top three to five requirements from the posting and write one sentence of evidence against each. Tailored beats polished, consistently.
Most cover letters are essays about how much the writer wants the job.
Only 9% of recruiters say they want to learn about a candidate’s motivation. Fewer still care about hobbies or personality. So the overwhelming majority of cover letters dwell on the one thing almost nobody asked for.
What the reader wants is narrower and much easier to supply: evidence that you have done the specific things the role requires. Here is how to write a cover letter around that instead.
What is a cover letter actually for?
To answer two questions your resume cannot: why this role, and why you. A resume lists what you did; the letter connects it to what this employer needs. It is a short pitch rather than a summary, and repeating your resume in prose wastes the only document that can do this job.
Harvard’s career service puts it plainly: a cover letter is not a summary of your resume, because the recruiter already has that.
In practice, its purpose is connective. The resume proves capability in the abstract; the letter argues relevance to one specific opening. That is why a letter which could be sent to twenty companies fails not because it is badly written, but because it is not doing the only job available to it.
Which produces the operating principle for everything below: tailored beats polished. A short, specific letter written for one role consistently outperforms a longer, more eloquent one that could have gone anywhere. You do not need to write well. You need to read the posting carefully and report your own work honestly.
How do you write a cover letter, structurally?
Four short paragraphs on one page, 250 to 400 words. Open with why this specific role, spend two paragraphs on evidence mapped to the posting's requirements, add the context your resume cannot carry, and close with a specific next step.
The shape has settled, and it is worth following:
| Paragraph | Job | Words |
|---|---|---|
| Opening | Name the role, give one concrete reason for this company | 40–60 |
| Evidence 1 | Their top requirement, met with a specific result | 60–90 |
| Evidence 2 | Their second or third requirement, same treatment | 60–90 |
| Close | Context the resume cannot carry, then a specific ask | 40–60 |
That fits comfortably in 250 to 400 words, which is what a hiring manager can absorb in the 30 to 60 seconds they spend.
Meanwhile, the two paragraphs in the middle are where most letters go wrong, so they are worth a method rather than advice.
How do you write the middle?
Take the top three to five requirements from the posting and write one sentence of evidence against each, using their vocabulary. That is the body paragraph structure — no invention required, and it guarantees relevance because the employer wrote the outline.
Learning how to write a cover letter body is mechanical rather than creative, and this is the part that produces the biggest improvement.
1. List their requirements. Read the posting and pull out the three to five things it emphasises. Repetition is the signal anything mentioned more than once is non-negotiable to them.
2. Write one sentence of evidence per requirement. Not a claim that you have the skill. A specific instance of having done it, with a number where one exists.
Their vocabulary, your evidence
3. Use their words. If the posting says “data-driven decision-making”, write that, not “analytical approach”. This matters for the human, who notices that you read the posting, and for the parser underneath.
4. Cut to the two strongest. Three sentences at half depth persuade less than two at full depth. The resume carries the rest.
Posting says: "Experience owning reporting for a distributed team."
Weak: "I have strong experience in reporting and have supported distributed teams throughout my career."
Strong: "I owned weekly reporting for four regional teams at Wexford, and rebuilt the forecasting model those teams now plan against — it cut the monthly close from twelve days to five."
Same requirement, same candidate. The second one is checkable, which is what makes it evidence rather than assertion.
Let the posting write your outline
The blank page problem disappears once you realise the employer already wrote your structure. Their top three requirements are your three body sentences, in their order of importance. You are not composing an argument from nothing — you are answering a list someone else made, which is a much smaller task and produces a far more relevant letter.
What should you leave out?
Salary expectations, reasons you left a previous job, anything negative, hobbies, and a prose retelling of your resume. Also cut adjectives about yourself — "hard-working, detail-oriented team player" is four claims with no evidence attached, and readers discount all of them.
Broadly, five things cost more than they add:
Your resume in sentences. The reader has it. A letter that summarises it has spent its only advantage.
Salary expectations. Unless the posting explicitly asks, this belongs in the salary conversation later, not here.
Negative context. Why you left, what went wrong, why there is a gap. A significant gap is worth one positive clause; anything more invites a question you would rather answer in person.
Adjectives about yourself. Passionate, dedicated, results-driven, detail-oriented. Each is a claim without proof, and a reader discounts them automatically.
Hobbies. Almost nobody wants them, and they consume words you need for evidence.
Customise every letter. A CareerBuilder survey found 63% of employers would reject a candidate whose letter was not customised, which makes this the highest-consequence rule in the whole format.
Send the same letter with the company name swapped. It fails the only test that matters, and it is the failure mode recruiters detect fastest.
Should you use AI to write it?
As an editor rather than an author. Only about 15% of employers view AI-written letters positively, and 80% of hiring managers notice and dislike content that sounds artificial. Supply your own material and let the tool compress it — the specifics are what a model cannot invent.
Here the honest position is neither prohibition nor enthusiasm.
An Oxford Careers Service survey in 2025 found only 15% of employers view AI-written letters favourably, and Harvard’s Amy Gallo reports 80% of hiring managers notice and dislike content that sounds artificial. Around 32% of candidates now use AI for drafts, which means the average AI letter is competing against a large field of similar ones.
What works is the split: you supply the raw material — real projects, real numbers, the posting itself — and the tool handles structure and phrasing. Using an AI cover letter generator properly covers the constraints that make the difference, and the underlying reason it matters: since anyone can produce 400 competent words in seconds, the letter no longer signals effort by existing. Only specificity does.
Should you write one at all?
Whenever the posting asks, and whenever the role matters enough to spend 25 minutes. Skip it for mass applications to large employers with an optional field, and for staffing-agency submissions where a recruiter introduces you directly.
Knowing how to write a cover letter matters less than knowing when to. The old advice to attach one to every application no longer holds, and being selective is what makes the ones you do write good.
Write one when the posting requests it, when you are changing fields, when you have a referral, when the company is small, or when a real gap needs one honest sentence.
Skip it for Easy Apply and Quick Apply routes with no field, for mass applications to large employers where it is optional, and when a staffing agency is introducing you.
The arithmetic favours selectivity. A tailored letter takes 25 to 40 minutes. Twenty generic ones take the same time and produce nothing, because the thing that works — specificity — is exactly what volume destroys.
A cover letter isn't a summary of your resume. Recruiters already have that. Its real job is to answer two questions your resume can't: why this role, and why you.
Where does the cover letter sit in the application?
Second. The resume decides whether a parser surfaces you at all; the letter decides whether a human who found you keeps reading. Neither rescues the other, and the letter is only worth writing once the resume reliably clears the first gate.
Finally, worth being clear about the order, because effort spent in the wrong place is the most common waste in a job search.
The resume faces a parser first, and a file that does not extract cleanly never reaches a person regardless of how good the letter is — what an AI resume checker measures covers that gate, and how an ATS works explains what actually filters candidates there.
The letter faces a human, and the two parts of it that carry most of the weight sit at either end. How to start a cover letter covers the opening, where 41% of hiring managers say the biggest impression forms. How to end a cover letter covers the close, whose job is narrower — proposing a specific next step for a reader already leaning toward yes.
Read in that order and how to write a cover letter stops being one question: an opening that makes a claim, a middle that proves it against their requirements, and a close that asks for something.
Frequently asked questions
How do you write a cover letter?
Four short paragraphs on one page, 250 to 400 words. Open with why this specific role, spend two paragraphs proving you meet the posting's top requirements with concrete evidence, and close with a specific next step.
What should a cover letter include?
Evidence mapped to the employer's stated requirements, in their vocabulary, plus the context your resume cannot carry — a career change, a relocation, a genuine connection to the company.
What do recruiters actually want in a cover letter?
Evidence of relevant work, not motivation. Only 9% of recruiters say they want to learn about a candidate's motivation, and fewer care about personality or hobbies.
How long should a cover letter be?
250 to 400 words across three or four short paragraphs, never more than one page. Hiring managers spend 30 to 60 seconds on one, so a tight 300-word letter outperforms a detailed 700-word one.
Do I need to customise every cover letter?
Yes. A CareerBuilder survey found 63% of employers would reject a candidate whose cover letter was not customised, which makes it the single highest-consequence rule in the format.
Can I use AI to write my cover letter?
As an editor rather than an author. Only around 15% of employers view AI-written letters positively, so supply your own specifics and let the tool handle structure and phrasing.
What should I not put in a cover letter?
Salary expectations, reasons you left a previous job, anything negative, hobbies, and a prose retelling of your resume. Also cut unsupported adjectives about yourself.
Are cover letters still worth writing in 2026?
Selectively. Write one when the posting asks, when you are changing fields, when you have a referral, or when the company is small. Skip it for mass applications with an optional field.
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