I made a mistake at work — do I tell my boss?

Yes, and before they find it. That is the collected answer of six separate conversations on the page Say it before they find it, and the same page is careful about where the advice stops.

Tell them the same day, in four plain parts. That page’s instruction: stop any damage that is still happening, understand it enough to describe it, then say what happened, what it affects, what you are doing about it, and what you will change. Skip the excuses. Five conversations there say why: a mistake you bring in is one you are handling, and a mistake someone finds is a question about your honesty; you are judged by what you did after, not by the slip. One account in a technical job says the logs tell the story regardless, so being caught later costs more. Two conversations say the deadline never really passes, late is still better than found, and that people are rarely sacked for erring; they are sacked for hiding.

Now, or with the fix in hand? Both pages carry the timing argument with no winner. On Say it before they find it, four accounts say own it at once, because the aftermath is what they will remember. On Being wrong ends when you say so, one camp says speed is the trust move everywhere, since delay reads as concealment when it surfaces, and the other has watched raw admissions land badly in professional rooms, where I broke it with no plan reads as incompetence, and times it for when you can say here’s what happened, here’s the remediation in one breath. Both camps agree on never letting the delay become a cover-up; the argument is about hours, not whether.

Why it feels impossible, and what it buys. Being wrong ends when you say so names the barrier as the actual subject: somewhere along the line, being right got welded to being worth something, so an error reads as an indictment, and for some people that weld was childhood, where mistakes brought punishment. The ledger runs against the fear: across many separate conversations people report that the colleague or friend who says I was wrong cleanly is trusted more afterwards, while the one who doubles down spends reputation with every escalation. Admitting it fast is a short sharp sting; defending it is the same sting on layaway. And a record of honest concessions is what makes your future stubbornness credible.

Say “my responsibility”, not “my fault”. “My responsibility” instead of “my fault” turns on a single word. Saying my fault generates a whole new set of problems on top of the one you started with, the shame, the case for the defence, the reflex to prove you could not have known, and none of them gets you closer to fixing anything. This is mine to deal with carries the same facts and the same work and leaves you able to move.

Who this is not for, in the mistake page’s own words. Anyone whose mistake could bring the police or a lawsuit: a lawyer first, before any apology. Anyone in a workplace that punishes honesty; four separate conversations and a dozen cautions there describe admissions that became ammunition, and the people who worked in those places do not say hide it, they say be accurate, keep your own record, and leave. Anyone being handed blame for a system that failed, who should own their part precisely and not an inch more. And the page is honest that several people did everything on it and lost the job anyway.