When to Write a Cover Letter? Clear Guide

Write a cover letter whenever the job posting explicitly asks for one, and whenever you can add meaningful context that your résumé cannot convey. If the application system marks it optional, you should still submit one unless the employer states that cover letters are not read.

Why Cover Letters Still Matter

Many job seekers assume cover letters are obsolete because some large companies use applicant tracking systems (ATS) that parse résumés and ignore attachments. However, a 2023 survey by ResumeLab found that 83% of hiring managers say a strong cover letter can land an interview even if the résumé is weak. The letter is your only chance to speak directly to the reader before they meet you, and it lets you show enthusiasm, explain gaps, or highlight a specific achievement that fits the role.

Even when a job portal marks the cover letter as “optional,” submitting one signals extra effort. In competitive fields like marketing, design, and nonprofit work, a tailored letter can be the deciding factor between two equally qualified candidates. Conversely, in high-volume retail or food service roles, a short note may be unnecessary—but it rarely hurts unless the employer explicitly says not to send one.

When the Posting Asks for One

The most obvious trigger is an explicit request. If the job description says “please include a cover letter,” or the application form has a required text field, you must write one. Skipping it can automatically disqualify you, because the hiring manager may use that field to filter out candidates who don’t follow instructions.

Even if the field is optional, read the tone of the posting. A startup that emphasizes “culture fit” or “tell us your story” is implicitly asking for a letter. A government or academic position almost always requires one, often with specific criteria to address. When in doubt, write a concise letter—but keep it under one page.

When You Have Something Important to Explain

Cover letters are ideal for addressing potential red flags or gaps that a résumé cannot explain. For example:

• A career change: explain why you’re pivoting and how your transferable skills apply.
• A long employment gap: briefly state the reason (e.g., caregiving, education) and emphasize your readiness to return.
• A relocation: mention that you are already moving to the city and do not need relocation assistance.
• A specific request in the posting: if they ask for a portfolio or a writing sample, reference it in the letter.

Do not use the letter to apologize or over-explain. One or two sentences on the issue, then pivot to your qualifications.

When You Can Add Value Beyond Your Résumé

If you have a compelling story or a concrete achievement that is not obvious from your work history, a cover letter gives you space to elaborate. For instance, if you increased sales by 30% at your last job, you can describe the strategy you used and how it would benefit this employer. If you are applying to a company whose mission you genuinely admire, you can explain why that mission aligns with your values—but only if you can be specific. Generic praise like “I love your company” is filler.

Also consider writing a letter when you have a referral. Mentioning the employee who referred you can boost your chances, but only if that person agreed to be named. A referral in a cover letter shows you have internal support and that you did your homework.

When Not to Write a Cover Letter

There are a few situations where a cover letter is unnecessary or even counterproductive:

• The employer explicitly says “no cover letters” or “applications without cover letters will be preferred.”
• The application system only accepts a résumé and has no upload field for a letter. In that case, you can paste a short note into the “additional information” box if one exists.
• You are applying through a recruiter who has already submitted your résumé and told you that the client does not want a letter.
• You have nothing new to add and would only repeat your résumé line by line. A generic, copy-pasted letter is worse than none.

In these cases, skip the letter and instead ensure your résumé is tailored and error-free.

How to Decide: A Simple Checklist

Before you skip the letter, ask yourself these questions:

1. Does the posting request one? If yes, write it.
2. Is the field optional? If yes, write a short one—it shows initiative.
3. Do I have a gap, career change, or relocation to explain? If yes, write it.
4. Can I name a specific achievement or a referral? If yes, write it.
5. Is this a role where soft skills matter more than technical skills? If yes, write it.
6. Am I applying to a small company or a startup? If yes, write it—they value personality.
7. Am I applying to a high-volume job with hundreds of applicants? If no, you can skip it.

If you answered “yes” to any of the first six, you should write a tailored letter. If you answered “no” to all, you can safely skip.

Common Mistakes to Avoid

Even when a cover letter is required, many applicants hurt their chances with avoidable errors:

• Using a generic template without changing the company name or role.
• Repeating the résumé verbatim instead of adding new information.
• Writing more than one page—hiring managers skim.
• Focusing on what you want (e.g., “I hope to gain experience”) instead of what you offer.
• Failing to proofread—a typo in the first sentence can sink you.

Always address the letter to a specific person if possible. If the name isn’t in the posting, check LinkedIn or the company website. If you cannot find a name, use “Hiring Manager” rather than “To Whom It May Concern.”

Cover Letter Template

Sample (fictional):

Frequently Asked Questions

Q: Do I need a cover letter if the job says “optional”?
A: Yes, unless the employer explicitly says they do not read them. Optional means they will accept applications without one, but a well-written letter can still give you an edge. Keep it short and tailored.

Q: Can I use the same cover letter for every job?
A: No. A generic letter is easily spotted and often ignored. You should at least change the company name, role, and one key achievement per application. A template is fine as a base, but you must customize it.

Q: How long should a cover letter be?
A: Keep it to three or four short paragraphs, under one page. Hiring managers spend about 30 seconds scanning it. Focus on your most relevant experience and a clear call to action.

Q: What if I have no experience in the field?
A: Use the letter to highlight transferable skills, such as communication, teamwork, or project management. Give an example of a time you used those skills successfully, even if it was in a different industry.

Q: Should I mention the salary I want in the cover letter?
A: No. Salary negotiations are best left for interviews or application forms that specifically ask for a number. Mentioning a salary in a cover letter can price you out or make you seem presumptuous.

Q: Is a cover letter necessary for internal positions?
A: Yes, often even more so. An internal cover letter lets you explain why you want the new role and how your institutional knowledge benefits the team. It also shows you are serious about the move, not just looking for any change.

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