What Is a Cover Letter and Do You Still Need One in 2025?

You've polished your CV, found a job you're genuinely excited about, and you're ready to hit apply — then you spot it: 'Please include a cover letter.' Cue the internal groan. Cover letters have a reputation for being time-consuming, awkward to write, and possibly pointless. But are they? The honest answer is: it depends. This guide breaks down exactly what a cover letter is, when you actually need one, and how to write something that genuinely helps your application rather than just padding it out.

What Is a Cover Letter?

A cover letter is a short, targeted document — typically three to four paragraphs — that accompanies your CV when you apply for a job. Unlike your CV, which lists your experience and skills in a structured format, a cover letter lets you speak directly to the employer in your own voice. It's your chance to explain why you want this specific role at this specific company, and to highlight the parts of your background that are most relevant to the position. In the UK, cover letters are usually sent as an email body or uploaded as a separate document alongside your CV. They should be tailored to each application — a generic, copy-and-paste letter is often worse than no letter at all. Think of it less as a formal requirement and more as a conversation starter: it sets the tone before a recruiter even opens your CV.

Do Employers Actually Read Cover Letters?

This is the question everyone wants answered. The truth is mixed. Some hiring managers read every cover letter carefully before looking at a single CV. Others skip straight to the CV and only glance at the letter if they're on the fence. A smaller number ignore them entirely. What this means practically is that a poor cover letter can hurt you, a strong one can genuinely push you ahead, and a mediocre one probably won't move the needle either way. Research consistently shows that cover letters matter most in smaller companies and creative industries, where personality and communication skills are part of the job. In large corporate environments or high-volume recruitment, automated systems may process your application before any human sees your letter. The safest assumption? Write a good one whenever it's requested — and treat it as an opportunity, not a chore.

When You Definitely Need a Cover Letter

There are certain situations where skipping a cover letter is a genuine mistake. First, if the job advert explicitly asks for one — not including it suggests you can't follow instructions, which is a red flag before you've even begun. Second, if you're changing careers or industries, a cover letter is almost essential. Your CV alone may not make the connection between your past experience and the new direction; the letter is where you explain the narrative. Third, if you're applying to a small business or a role where you'd be working closely with the hiring manager, a personalised letter shows genuine interest. Finally, if there's something on your CV that needs context — a career gap, a short tenure, a non-linear path — the cover letter is the right place to address it briefly and confidently rather than leaving the employer to draw their own conclusions.

When You Can Probably Skip It

Not every application demands a cover letter, and sometimes the situation makes it clear one isn't needed. If the job application form has no field for a cover letter and no mention of one in the advert, don't force one in. Some online application portals — particularly those used by large retailers, logistics firms, or graduate schemes with structured processes — don't want additional documents outside the form itself. Similarly, if you're applying through a recruiter rather than directly to a company, they'll usually advise you on what's needed; in many cases they'll manage the introduction themselves. That said, if you're ever genuinely unsure, a brief, well-written covering note rarely hurts. Even two focused paragraphs that explain your interest and key fit are better than a lengthy generic letter that could have been written for any job.

What to Include in a Strong Cover Letter

A good UK cover letter follows a clear structure without being rigid. Start with a direct opening that states the role you're applying for and a compelling reason why you're interested — not 'I am writing to apply for...' which wastes the employer's time. The middle section should connect your most relevant experience to two or three key requirements from the job description. Use specifics: a project you led, a result you achieved, a skill you've applied in a real context. Avoid restating your CV line by line. Then close with a confident statement of your interest and availability for interview — keep it professional, not pleading. The whole letter should fit comfortably on one page, ideally under 400 words. If you're struggling to get your CV and cover letter working together, tools like StackedCV.com can help you align both documents to the specific role you're targeting, saving you significant time in the process.

Common Cover Letter Mistakes to Avoid

Even well-intentioned cover letters can backfire if they fall into common traps. The biggest mistake is writing a generic letter and swapping out the company name — recruiters spot this immediately and it signals low effort. Equally damaging is writing a letter that simply repeats everything already on your CV; it adds no value and wastes the reader's time. Avoid starting every sentence with 'I', which makes the letter feel self-centred rather than focused on what you can offer the employer. Don't include irrelevant personal information, salary expectations (unless asked), or anything negative about a previous employer. Typos and formatting errors are particularly costly in a cover letter because it's a direct sample of your written communication skills. Finally, don't make it too long. A hiring manager reading fifty applications in a day will not thank you for four dense paragraphs when two sharp ones would do the job.

Cover letters aren't going away, but they don't have to be the most stressful part of your job search. When you write one with genuine intent — tailored to the role, focused on what you offer, and free from filler — it can be the thing that gets you the interview over a candidate with a near-identical CV. The key is knowing when one is truly needed, what to put in it, and how to keep it sharp and specific. If you want your CV to be just as compelling as your cover letter, StackedCV.com uses AI to rewrite and optimise your CV for the exact roles you're applying to — so every part of your application is working as hard as possible.