When a Posting Says the Cover Letter Is Optional

“Optional” almost never means we’d rather you didn’t. It usually means the form was built by someone who didn’t want to screen out people who find writing hard. So the word tells you very little about whether the letter will be read.

The question worth thirty seconds is different: do you have something to put in the letter that the resume cannot carry? If yes, write it. If no, a dutiful paragraph of nothing is worse than an empty field.

What the word is doing on the form

Three different situations produce the same label.

Sometimes a team genuinely reads every letter and marks the field optional out of fairness. Sometimes nobody has looked at the field in two years and it survives because deleting things from an application form requires a meeting. And sometimes the wording is legal-adjacent caution — an accessibility or fairness review flagged a required essay box, so it became optional and stayed.

You cannot tell which from outside. That’s the point: you can’t infer the reader from the form, so don’t try. Decide based on what you have to say instead, which is the one variable you actually control.

The thirty-second test

Read the posting once more and ask: is there a question a reader would have about my application that the resume answers badly or not at all?

Common ones:

The posting names a specific problem and you’ve solved that exact problem, but the resume records it as a job title.
You’re changing field, industry, or level, and the resume shows the change without explaining it.
You’re missing something the posting asks for, and you have a real answer for that.
You’re applying from a different country or timezone.
You know something about their situation that isn’t public knowledge — you use the product, you’ve worked with their data, you’ve been on the other side of the process they’re hiring to fix.
You have judgement about the work that only shows up in prose.

If any of those apply, you have a letter. If none do — you’re a straightforward, well-matched candidate with a resume that reads clearly and nothing unusual to explain — the letter is genuinely optional and the honest answer might be to skip it.

Skipping properly

If you skip, skip. Don’t put three sentences of throat-clearing into the box because leaving it blank feels rude.

A field containing “Please see my attached resume. I am excited about this opportunity and believe my skills are a strong match.” is worse than the same field empty. It costs a reader ten seconds and returns nothing, and it establishes that when given room to say something you had nothing. Empty says I read the word optional and took it literally, which is a defensible reading.

The exception is a required field that you’d rather not fill. Then write the shortest real thing you can — one paragraph, one specific point of match. Two or three sentences of substance beats a page of filler and it beats a single stock line.

When “optional” hides a very short box

A growing number of forms replace the letter with a small free-text field: Why are you interested in this role? — 500 characters, sometimes 300. This is the same document with the padding surgically removed, and it’s a gift.

Everything decorative is now impossible. What’s left is one specific claim and one piece of evidence:

I spent last year consolidating three regional reporting pipelines into one warehouse, which is most of what your second bullet describes. The interesting part was never the modelling — it was getting three teams to agree what “complete” meant.

That’s 280 characters and it does the job of a page. If you’ve ever wondered what to cut from a letter, write the 300-character version first and then decide what earns its way back in.

The channel matters more than the label

If the application is an email rather than a portal, the letter is not optional in any meaningful sense — you have to write something in the email body, and that something either does the work of a cover letter or wastes the space. See whether the letter belongs in the body or an attachment for how to handle that.

If the application is a portal with no letter field at all, and you have one of those genuinely-needs-explaining situations, the letter still has somewhere to go: the top of the resume as a two-line note, or a separate message to a person you can find. That second route is a different form with different rules — cold outreach rather than an application document.

Norms vary more than any advice admits

Whether a letter is expected at all differs sharply by country, industry, sector, and seniority. In some markets a letter is a near-universal courtesy and its absence is read as carelessness. In others — particularly for engineering roles routed through a portal — nobody expects one and a long one raises an eyebrow. Public sector and academic applications frequently require a letter that’s closer to a structured statement, answering named criteria in order.

If you’re applying into a field or a country you don’t know, ask one person who works in it rather than following a rule you read somewhere. That single question will beat any general claim, including this one.

The version of this that actually costs you

The failure mode isn’t skipping the letter. It’s writing an optional letter out of anxiety — a page produced because leaving the field blank felt risky, containing nothing you’d defend in an interview.

That letter takes forty minutes you could have spent on the application itself, and it tells the reader you’ll produce documents on request without asking what they’re for. If you’re going to write it, write it because you have something to say. What the document is for is the deciding question every time, and “optional” doesn’t change the answer — it only removes the excuse of having been made to.