In 2026, a cover letter is optional for most applications and decisive for a few. The honest rule: skip it when it's not requested and the application is high-volume; write a short, specific one when it's requested, when you're a non-obvious fit, or for a small/mission-driven employer.
For high-volume applications through large ATS portals where no cover letter is requested, you can usually skip it. At that scale, most are never read, and your effort is better spent tailoring the resume itself to the job description — that is what the recruiter's keyword search actually filters on.
If the application form makes the cover letter optional and you're applying to many similar roles, a strong, tailored resume is the higher-leverage use of your time.
Write one when: it is explicitly requested or required (not writing one signals you don't follow instructions); you are a non-obvious fit (career changer, gap, relocating) and need to explain the connection a resume can't; the employer is small, early-stage, or mission-driven, where a human reads every application; or you have a specific, genuine reason for wanting this role that strengthens your case.
In those cases the cover letter is not a formality — it is where you make the argument the resume can't.
Three short paragraphs. First: the specific role and one genuine, specific reason you want it (not "I am passionate about your mission" — a concrete reason). Second: the single strongest piece of evidence you're a fit, with a number, mirroring the job's top requirement. Third: a brief, confident close.
Keep it under 250 words. Address a real person if you can find the name. Never restate the resume line by line — the cover letter's job is to add the context and argument the resume format can't carry. And never use a generic template you send to everyone; recruiters spot it instantly.
Tailor your resume to the role first — it's the higher-leverage move. The free scorer shows matched and missing keywords against any job description.
