Both phrases are common in Japanese business, and they are easy to mix up. Choosing the wrong one can make your message feel slightly off. This article gives you one clear rule to decide between them.
The Core of Otsukaresama desu (お疲れ様です)
Core meaning: Appreciation for a teammate who works toward the same goal.
The logic: “We are on the same team, and we are both putting in effort.”
This phrase is for people inside your own organization. It says, “You did hard work today” and “Let’s keep going together.” It works like a friendly pat on the shoulder between people who share a goal.
The Core of Osewa ni natte orimasu (お世話になっております)
Core meaning: Gratitude to someone outside your organization.
The logic: “Thank you for the support you give to us.”
This phrase is for people outside your company who provide work, support, or benefits to you. It says, “We could not do this without your help.” It keeps a respectful distance and shows a small bow of thanks.
The Simplest Rule
Is the other person an employee of your own company?
- Yes → Otsukaresama desu. This applies to a senior executive, and it also applies to someone from another department whom you have barely spoken to.
- No → Osewa ni natte orimasu. This applies to a partner company’s staff who do the same work as you, and also to the HR person at a company you are applying to.
Case-by-Case Guide
1. Chatting with your boss in the same team or department
✅ Use: お疲れ様です (Otsukaresama desu)
❌ Avoid: お世話になっております (Osewa ni natte orimasu)
Your boss in the same department is fully part of your own side (uchi). You work on shared tasks every day, so a phrase that recognizes each other’s daily effort fits naturally. Osewa ni natte orimasu would sound as if you were writing to an outside company.
2. Chatting with your subordinate in the same team or department
✅ Use: お疲れ様です (Otsukaresama desu)
❌ Avoid: お世話になっております (Osewa ni natte orimasu) and ご苦労様です (Gokurousama desu)
Otsukaresama desu is the right choice here too. Osewa ni natte orimasu is for outsiders. Gokurousama desu is also better avoided, because it is traditionally said from a higher position to a lower one and can sound like you are looking down on the person.
3. Saying goodbye when you leave work
✅ Use: お先に失礼します (Osaki ni shitsurei shimasu)
❌ Avoid: Using お疲れ様です or お世話になっております alone
Osewa ni natte orimasu does not fit a farewell at all. Saying only Otsukaresama desu or Otsukaresama deshita as you leave is also not ideal. Otsukaresama mainly thanks someone for finishing their work. If you say it to colleagues who are still working, whether in the office or online, it can feel slightly odd, as if they were being praised for finishing when they are not done yet. Osaki ni shitsurei shimasu (“Excuse me for leaving before you”) is the natural way to say goodbye. You can combine them, for example Osaki ni shitsurei shimasu. Otsukaresama deshita.
4. Chatting with an outside partner who does the same work as you
✅ Use: お世話になっております (Osewa ni natte orimasu) as your default, then adjust flexibly
⚠️ Be careful with: お疲れ様です (Otsukaresama desu)
Even if you work side by side, a partner company’s staff belong to a different legal organization. If you use the in-group phrase Otsukaresama desu too early, the other person may feel that you see them as a subcontractor instead of an equal partner, or that you are being overly familiar. So while the relationship is new, or while the communication style is not yet clear, Osewa ni natte orimasu is the safe and respectful base.
In daily, frequent exchanges, though, flexibility is recommended. If the other person uses Otsukaresama desu, or if your team has a shared rule, you can follow their style.
5. Chatting with someone from another department you have only talked to a few times
✅ Use: お疲れ様です (Otsukaresama desu)
❌ Avoid: お世話になっております (Osewa ni natte orimasu)
You may not know this person well, but they work at the same company, so by definition they are on your side. Using Osewa ni natte orimasu with an internal colleague puts up a wall, as if they were a client, and that can get in the way of smooth cooperation across departments.
6. Emailing a client for the very first time
✅ Use: 初めてご連絡申し上げます (Hajimete go-renraku moushiagemasu) or similar opening lines
❌ Avoid: お疲れ様です (Otsukaresama desu)
Using the internal Otsukaresama desu with an outside customer is not appropriate and can feel too casual.
Osewa ni natte orimasu also needs care. It assumes an ongoing relationship, so if your company has had no contact with theirs before, it can feel slightly strange to the reader, as if to say, “We haven’t actually done anything for you yet.” More accurate and sincere options are:
- 初めてご連絡申し上げます (Hajimete go-renraku moushiagemasu): “I am contacting you for the first time.”
- 突然のご連絡にて失礼いたします (Totsuzen no go-renraku nite shitsurei itashimasu): “Please excuse this sudden message.”
- この度は〇〇の件でお世話になります (Kono tabi wa ○○ no ken de osewa ni narimasu): “Thank you in advance for your help with ○○.”
7. Emailing HR at a company you are applying to, to schedule an interview
✅ Use: お世話になっております (Osewa ni natte orimasu). For your first reply, お世話になります (Osewa ni narimasu) also works.
❌ Avoid: お疲れ様です (Otsukaresama desu)
To the company, a job applicant is an outside individual, not an internal colleague. If an applicant uses Otsukaresama desu, it can look as if they are treating themselves as an insider, which may suggest they are not yet familiar with basic business manners, and that could affect the selection process.
During scheduling, HR is spending time on your application and checking your documents. Osewa ni natte orimasu expresses your thanks for that, and it is the standard choice.
8. Emailing HR about onboarding after you have received a job offer
✅ Use: お世話になっております (Osewa ni natte orimasu)
❌ Avoid: お疲れ様です (Otsukaresama desu), which is too early to switch
After you accept an offer, it is natural to feel that you already belong to the company. But your position as an outside individual (a person who has accepted an offer) continues until the employment contract takes effect and you start work on your first day. If you greet HR with Otsukaresama desu before your first day, it may seem as if you jumped ahead and used in-group language too soon. Keep using Osewa ni natte orimasu until you officially join.
Summary
| Situation | Best choice | Reason |
| 1. Boss in the same team or department (chat) | お疲れ様です | Fully inside your organization |
| 2. Subordinate in the same team or department (chat) | お疲れ様です | Inside your organization; avoid ご苦労様です, which can sound condescending |
| 3. Leaving work | お先に失礼します | Otsukaresama thanks people for finishing work, but colleagues who remain are still working |
| 4. Outside partner doing the same work (chat) | お世話になっております (adjust flexibly) | Different organization; follow the partner’s style or team rules over time |
| 5. Colleague in another department, little contact | お疲れ様です | Same company means inside your organization, even without personal familiarity |
| 6. First email to a new client | 初めてご連絡申し上げます, etc. | No past relationship, so Osewa ni natte orimasu may not match the facts |
| 7. HR at a company you are applying to | お世話になっております | You are an outside individual, and HR is giving you their time |
| 8. HR after a job offer, before your first day | お世話になっております | Still an outsider until employment officially starts |
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