How to apologize for a mistake at work in Japanese (and report it the right way)

You notice that the quote you sent a client an hour ago has the wrong price. Should you fix it quietly? Email the client first? Here is what Japanese teams expect — and the exact message to send your boss.

The short answer Tell your boss first, and fast. In Japanese teams, a late report usually hurts more than the mistake itself. Report in this order: what happened → impact → what you've done or propose → apology.

Why speed matters: 報連相

報連相 (hōrensō) — report (報告), contact (連絡), consult (相談) — is a basic rule taught to new employees in Japan. For mistakes it means: don't wait until you've fixed it. Report early, then fix it together.

The order

Conclusion first — what happened, in one sentence.
Impact — who is affected, how big. For numbers, show wrong → correct (誤→正, go → sei).
What you've done, or what you propose — then ask for your boss's OK.
Apology — short and sincere. No excuses first.
Later: the result + how you'll prevent it (再発防止, saihatsu bōshi).

A message you can copy: urgent report to your boss

Urgent report — chat

〇〇さん
お疲れさまです。〇〇です。
至急ご報告です。
本日△△社にお送りした見積書で、金額を誤って記載していました（誤：100,000円 → 正：120,000円）。
先方はまだ発注前です。
訂正版を作成済みですので、送付してもよろしいでしょうか。
確認不足でした。申し訳ありません。

Urgent report: the quote I sent to △△ today had the wrong amount (wrong: ¥100,000 → correct: ¥120,000). They haven't placed the order yet.

I've already prepared a corrected version — may I send it? I didn't check carefully enough. I'm sorry.

Replace the names, the document and the numbers with your own. If you haven't prepared a fix yet, replace the line 「訂正版を作成済みですので、送付してもよろしいでしょうか。」 with 「どう対応すればよいか、ご指示いただけますでしょうか。」 ("Could you tell me how I should handle this?") and keep the apology at the end.

Apology words, from casual to formal

Japanese	When to use it
すみません sumimasen	Small slips with coworkers (a wrong link, a typo)
申し訳ありません mōshiwake arimasen	To your boss, for bigger mistakes
申し訳ございません mōshiwake gozaimasen	To clients, or for serious mistakes
お詫び申し上げます owabi mōshiagemasu	To clients, in writing (emails, letters)

✗ ごめんなさい (gomen nasai) — fine with friends and family, but too casual at work.

Two common mistakes

✗ Fixing it quietly first, reporting later. If someone else finds it first, the problem becomes trust, not the mistake.
✓ 至急ご報告です。 (shikyū go-hōkoku desu, "Urgent report.") — report, then fix together.

✗ Starting with the reason. でも、〇〇が…… ("But 〇〇 …") sounds like an excuse.
✓ Conclusion → impact → fix → apology.

Want the full set? The PDF guide Reporting a Mistake & Apologizing has 6 templates — the report above, plus an apology email to a client, "consulting" your boss before a deadline slips, apologizing in person with romaji, reporting the result after the fix, and a small slip to a coworker — plus a checklist and a quick-reference table.
Available on Gumroad soon.

Every workplace is different. When your company's rules or your boss's instructions differ from this guide, follow them.