Cover letter checklist: when to send, structure, and customize

A cover letter checklist covers when a letter is worth writing, how to structure one page, and how to customize proof for each posting so you are not shipping the same AI-flavored paragraph with a new company name pasted in. Many roles in 2026 never read a letter. When they do, the ones that work are specific, short, and honest about why you fit this opening. Use the interactive list below before you spend an hour on an application that will only be scored on the resume.

I used to write a letter for every job. Then I watched recruiters at two companies skip straight to the resume PDF and never open the second attachment. That was useful. It forced a rule: only write when someone is likely to read it, and when I do write, ban the template voice that sounds like every other applicant who asked a chatbot for help.

This checklist is 90 tasks across when to send, research, structure, opening, body evidence, customization, closing, anti-AI language, and proof before submit. Harvard FAS Career Services and similar university guides still treat letters as a place for fit and narrative the resume cannot hold. Indeed and HBR both push specificity over length. The job is not to sound impressive. The job is to make one clear case.

When to send: most roles skip letters

Read the posting. Required means write it. Strongly preferred usually means write it if you want to be competitive for that employer. Optional is a judgment call: write if you have a referral story, a career change to explain, or a constraint the resume buries. If the portal has no upload field and the text never mentions a letter, skip it. Your time is better spent on the resume keywords and a tight LinkedIn.

Letters still matter for academic jobs, fellowships, government packets, many nonprofits, and small teams where a founder opens every application. They also matter when an employee referred you. Name the referral in the first two lines. That is often the only reason the file gets opened.

Do not send a letter that only restates resume bullets. If you have nothing to add, not writing is the professional move.

Research before writing

Highlight must-haves in the description. Note two problems the role exists to solve. Pull one recent company fact from a product update, press note, or blog post, not a recycled About page slogan. Find a hiring manager or team lead name when it is public.

Map three resume wins to the top requirements and attach a metric to each before you draft. Decide your one-sentence reason for this company. If you cannot say it without sounding generic, you are not ready to write.

Structure and format

Match your resume header. Keep the letter to one page, about 250 to 400 words. Use a boring readable font at 11 or 12 point with normal margins. Address a person by name when you have one. If not, Hiring Team beats To Whom It May Concern.

First paragraph: role title, company, and a concrete fit fact. Middle: one claim and one proof per paragraph. Close: interest, thanks once, contact line. Export PDF unless they demand another format.

Opening without template sludge

Name the job in sentence one. Drop I am writing to express my interest. Lead with a fit fact or a referral, not a stack of enthusiasm adjectives. Passionate about your mission fails unless you can say why in plain language tied to their work.

Avoid chatbot openers: As a seasoned professional, I am excited to leverage. If the first paragraph could be reused for fifty other jobs, rewrite it. Keep the opening under four sentences and preview the strengths the body will prove.

Body evidence that earns the read

Answer two requirements from the posting directly. Give each paragraph a result with a number, time frame, or scope. Name tools or domains they actually listed. Add context the resume cannot hold: a constraint, a tradeoff, a lesson.

Cut soft claims: hard worker, team player, results-driven. Prefer I shipped, I cut, I led over I was responsible for. Career changers should map one transferable win to this role's problem. Address a gap only when silence would look worse than a short, calm note.

Customization that is not find-and-replace

Every application needs a fresh company name, product reference, and role title. Swap which proof story comes first so the strongest match for this posting leads. Mirror two keywords from the description only where they are true for you.

Strip leftover names from the last draft. Adjust density for the industry. For creative roles, point to one portfolio piece with a one-line why. For internal moves, cite known projects. If time is short, customize the opening and first proof and cut the rest. Refuse paste-and-send AI templates that only swap the logo in the first line.

Closing and call to action

Restate interest without cloning the opening. Ask for a conversation in one plain sentence. List phone and email again on standalone PDFs. Thank the reader once. Skip salary unless they required it in the letter. Sign normally, type your name, add LinkedIn or portfolio only if it helps this role.

Tone and anti-AI language

Cut leverage, utilize, delve, synergistic, dynamic professional, and proven track record. Write like a careful email from a real person. Keep first person. Vary sentence length. Remove em dashes used as fake drama. Ban empty adjective stacks of three.

If you used AI to outline, rewrite every sentence in your own words. Recruiters have seen the same generated cadence thousands of times. Specific beats polished.

Proof and submit

Spell-check, then read aloud. Confirm company name and job title match the posting exactly. Confirm contact info matches the resume. Search for wrong-company leftovers. Name the PDF clearly. Follow portal file rules. If emailing, put the role title and your name in the subject. Save the final letter with that posting and log the date in your tracker.

A cover letter only helps when someone will read it and when it says something the resume cannot. Work the checklist, skip the template voice, and put the saved hour into the applications that actually ask for a letter. Pair this with our resume writing guide, job interview preparation, job search checklist, and LinkedIn optimization guide.