What a Cover Letter Is Actually For
The three jobs only a cover letter can do, the situations where it changes an outcome, and the applications where writing one is wasted effort.
Kazifi Careers Team · Careers & ATS specialists
The question people ask is whether cover letters still matter. The more useful question is what a cover letter can do that a resume cannot, because that defines both when to write one and what to put in it.
The three jobs only a letter can do
One: explain something the resume raises but cannot answer. A resume shows a two-year gap, a move across the country, three short contracts, or a jump between unrelated industries. It cannot explain any of them. The letter can, in one sentence, which stops the reader inventing a worse explanation.
Two: connect your evidence to their specific problem. A resume lists what you did. A letter can say why that particular experience matters for this particular role, which is an argument rather than a record.
Three: demonstrate that you can write. For any role involving communication, the letter is a work sample. This is invisible on a resume, where the format constrains the writing to fragments.
Everything else people put in cover letters is either duplication or decoration.
When it genuinely changes the outcome
Six situations, and they share a property: something in your application needs interpreting.
- A career change. The resume looks wrong for the role and the letter is what makes it look deliberate. See how to change careers.
- A gap or a non-linear history. One factual sentence, no apology.
- A relocation. Especially if your current address is out of area, which is a common early filter.
- Overqualification or a step down, where the reader’s real question is whether you will leave in six months.
- A speculative approach with no posting. Here the letter is the whole application. See cover letter versus letter of interest.
- A referral. The one sentence naming who suggested you apply is worth more than everything else in the letter.
When it is wasted effort
Also worth saying, since the standard advice to always write one costs people a lot of time.
If you are applying to a role you plainly fit, through a portal, at a large employer, with no gaps and no explanation required, and the letter is marked optional, a letter that restates your resume adds nothing. Volume applicants are better off spending that time tailoring the resume, which is read.
The test: can you write three sentences that are not on your resume and that a reader would want? If yes, write the letter. If no, do not manufacture them.
Why “optional” is not a trick
The instruction usually means what it says. What it does not mean is that a bad letter is free.
A generic letter is worse than no letter, because it demonstrates you will produce generic work. A letter opening with how excited you are about the opportunity has spent its most valuable line on nothing. If you write one, it has to be specific to the role. See how to start a cover letter.
What goes in it
Both Purdue’s cover letter guidance and Harvard’s career service materials converge on a short, targeted document rather than an expansive one, and that convergence is worth noting given how much advice pushes the other way.
The working structure is four short paragraphs: why you are writing and what for, the one thing about you that matters most here, the thing that needs explaining if anything does, and the close. Detail in the cover letter outline guide, and length in the cover letter length guide.
The division of labour
The clearest way to think about it.
The resume answers: what have you done, where, when, and with what result.
The letter answers: why this role, why you specifically for it, and what about my application needs a sentence of context.
If a paragraph in your letter answers a resume question, delete it. The full comparison is in cover letter versus resume.
Where it gets read
Worth knowing, because it affects how you write.
In a small organisation, the person who reads it is often the hiring manager, and it can genuinely decide a shortlist. In a large one it may be a recruiter scanning quickly, or nobody at all until a later stage.
The practical consequence: front-load. The first two sentences have to carry the argument, because you cannot rely on the fourth paragraph being reached. Build to a point and you have built to something nobody read.
The honest position
A cover letter is a cheap option with an occasionally large payoff. Write one when you have specific information the resume cannot carry. Skip it when you do not, and put the time into the resume instead.
What you should never do is write the same letter for twenty applications with the company name changed. That is the version everyone means when they say cover letters do not matter.
Related
For structure, see the cover letter outline guide and the cover letter length guide. For the openings and closings, see how to start a cover letter and how to end a cover letter. For graded examples, see the best cover letter examples.
Or write one in a few minutes with the cover letter generator, free to try at Kazifi.
Common questions
Do cover letters still matter?
They matter selectively. For a straightforward application to a role you obviously fit, they change little. For a career change, a gap, a relocation or a speculative approach, they carry information your resume cannot.
Should I write a cover letter if it is optional?
Write one when you have something specific to say that the resume cannot say. If your letter would only restate your resume in prose, its absence costs you nothing and its presence adds nothing.
Does anyone actually read cover letters?
Sometimes nobody, sometimes it decides the shortlist. It varies by employer, by role and by who is screening. The realistic view is that it is a low-cost option with an occasional high payoff.
What should a cover letter never do?
Restate your resume, explain how much you have always admired the company, or describe your enthusiasm at length. All three consume the space where the useful information belongs.