The honest answer is sometimes — and the pattern of when is predictable enough to save you a lot of wasted effort. Here's the decision logic we'd use, plus the one rule that makes a cover letter worth reading when you do write one.
When to write one, when to skip it
Write it when
- The posting explicitly asks for one — required means required
- A human reads applications end-to-end (small companies, direct-to-manager)
- You're changing careers or explaining a gap — the resume can't argue, the letter can
- Someone referred you — give that human one page of ammunition
Skip it when
- Hundreds of applicants and an automated funnel — it's often never opened
- The field is optional at a big company
- You'd be sending the same boilerplate everywhere
- You haven't fixed the resume's keyword gaps yet — the letter can't rescue it
In the skip cases, an hour spent tailoring your resume keywords beats an hour spent on prose, every time — the letter is read after the parsed resume already passed or failed.
Does the ATS read the cover letter?
Usually it stores and indexes it, so the text is searchable alongside your resume. But in every ranking model we've seen, the resume carries the weight — the cover letter is a document attached to your record, not a second scored input.
The practical consequence: don't write the letter for the machine. Stuffing it with keywords buys you nearly nothing and costs you the only thing the letter is actually good at, which is sounding like a person who thought about this specific job.
The one rule: every claim traces to your resume
The fastest way to torch a good application is a letter that outruns the resume — skills the resume never shows, enthusiasm for a stack you've never touched. Recruiters read the two documents side by side, and mismatches read as fabrication.
The structure that gets read
The strong letter is narrow. Under a page, no restating your history:
- 1
One sentence: why this role, specifically
Name something real about the team, product, or problem — not the company's size or prestige.
- 2
Two short paragraphs: your strongest evidence vs their top two requirements
Pull the numbers straight from your resume bullets — the quantified ones do the persuading.
- 3
One closing line
Availability and a plain sign-off. Confidence is brevity.
Target 200–350 words. A letter that reaches a full page of dense prose is usually restating the resume, which is the one job it doesn't have.
What to cut
Keep
- A specific, checkable reason you want this role
- Two pieces of evidence that map to their top two requirements
- One sentence of context the resume can't carry — a gap, a pivot, a relocation
- A plain closing line
Cut
- 'I am writing to apply for the position of…' — the subject line already said it
- 'To Whom It May Concern' — use the team name if you can't find a person
- A paragraph restating your work history in prose
- Adjectives about yourself: passionate, driven, results-oriented, detail-oriented
- Anything about what the job would do for your growth
The twenty-minute version
If you've decided a letter is worth it, this is the whole process:
- Copy the posting's top two requirements into a blank document.
- Under each, paste the resume bullet that best proves it — numbers included.
- Write one opening sentence naming something concrete about the role.
- Turn each requirement-plus-bullet pair into two or three sentences.
- Add a one-line close. Delete every self-descriptive adjective. Send.
You'll notice there's no research phase beyond reading the posting properly. That's deliberate: the thing that makes a letter land is precision about the match, not evidence that you memorized the company's About page.
Special cases worth the effort
Career changes. This is the letter's best use. The resume shows a discontinuity; the letter is where you explain the throughline, and it's the only place you can.
Employment gaps. One clear sentence, no apology, no detail you don't owe. "I took eighteen months out for family care and have been rebuilding my SQL work since January" closes the question that the date range otherwise leaves open.
Referrals. When someone referred you, the letter is ammunition for them — the internal advocate who has to say something specific about you in a meeting you're not in. Make their argument for them.
This grounding rule is why MeritSlate's cover letter generator is constrained to your parsed resume: it drafts from the experience and metrics you actually have, against the JD's weighted requirements — and refuses to invent the rest.
Sequence it correctly
A cover letter amplifies a resume that already matches; it cannot rescue one that doesn't. Run the free Merit Score first, close the keyword and evidence gaps it lists, and only then decide — using the rules above — whether this particular application earns a letter at all.
Frequently asked questions
- Do recruiters actually read cover letters?
- Sometimes — most often for career changes, employment gaps, senior roles, and smaller companies. They rarely rescue a resume that already ranks poorly. Treat the cover letter as the place to explain context your resume can't, not as a second copy of it.
- Does an ATS scan cover letters for keywords?
- Some systems index cover letter text alongside the resume, but the resume carries the weight in every ranking model we've seen. Write the letter for the human who reads it after your resume has already earned attention.
Written by
MeritSlate Team
The team building MeritSlate's deterministic scoring engine — nine evidence-anchored axes, a nine-vendor ATS parse simulation, and every point backed by receipts.