Choosing the right tone in business communication can be as important as the message itself. The real challenge is not simply whether you can speak English, but whether you know which version of English to use, and when.
To be specific, formal and informal English are not about being right or wrong. They are just two different ways of speaking that exist on the spectrum. So, your choice depends on who you talk to (audience), why you talk (purpose), and what you want to say (content). Getting this right makes you sound professional and clear.
However, getting it wrong can cause problems with people or make you seem unprofessional.
Understanding the Two Styles
You need to know the main features of both styles to use them well.
Formal English
Formal English is polite, precise, and serious. So, it is better if you use it for official papers and when you talk to someone for the first time or to very important people.
Words and Sentences: It uses longer, more difficult words. Sentences are usually longer. Do not use short forms (contractions) like "don't" or "we're."
Tone: The style is impersonal and calm. It focuses only on the business topic.
Rules: You must use perfect grammar. Use full words instead of two-word verbs (phrasal verbs). For example, use "postpone" instead of "put off."
Informal English
Informal English is relaxed, friendly, and personal. You can use it when you work closely with your team and build good relationships.
Words and Sentences: It uses simple, short sentences and everyday words. Contractions are okay (e.g., "it's," "don't"). You can use common business phrases like "touch base."
Tone: The style is warm, friendly, and direct. You can talk a little about yourself or your feelings.
Rules: Grammar is important, but small mistakes or very short sentences are sometimes okay if everyone understands.
When to Use Each Style
Your decision depends on Who (Audience) and What (Content). The Audience changes how formal you need to be. You should speak more formally to a new client than to a friend at work. The Content shows how serious the topic is. For example, very serious or official subjects always need a more structured, formal style.
- Formal Language
Use formal English in these situations:
- First contact with someone new. You don't yet know their communication style, so starting formal is the safer choice. You can always become less formal later, but it's awkward to suddenly become more formal after several casual exchanges.
- Writing to senior management or executives. Even if your company culture is generally relaxed, communications upward in the hierarchy typically require more formality.
- Serious matters requiring documentation. If you're discussing complaints, legal issues, performance problems, or anything that might need to be referenced later, formal language protects everyone involved.
- External clients or partners. When representing your company to outside organisations, formal language maintains professionalism and shows respect.
- Cross-cultural communication. When working with colleagues from different countries, formal language helps eliminate any misunderstandings and helps you sound polite and professional.
- Informal Language
You can relax your language when:
- Writing to close colleagues you work with daily. If you chat with someone every day, overly formal emails feel strange and create distance.
- Following up on casual conversations. If you discussed something over coffee, maintaining that casual tone in your email feels natural.
- Internal team communications. Within your immediate team, especially in casual industries like tech or creative sectors, informal language builds rapport.
- You've established a relaxed relationship. Once someone else has used informal language with you first, you're safe to mirror their style.
The Same Message, Different Tones
Here's how the same information sounds in both styles:
Formal version: "Dear Mr Thompson, I am writing to request an extension for the project deadline. Due to unexpected delays in receiving client feedback, we require an additional week to complete the final revisions. We anticipate delivery by 30th March. I apologise for any inconvenience this may cause. Please let me know if this is acceptable. Kind regards, Sarah"
Informal version: "Hi James, Quick update on the project. We're going to need an extra week. The client took longer than expected to send feedback, so we're now looking at 30th March for final delivery. Hope that works for you. Let me know if it's a problem. Thanks, Sarah"
The information is identical. Only the tone changed.
What Actually Changes Between Formal and Informal
Greetings: "Dear Mr Thompson" becomes "Hi James"
Contractions: "I am writing" becomes "I'm writing" or simply "Writing to update you"
Vocabulary: "I would like to discuss" replaces "I want to talk about", and "provide" sounds more formal than "give"
Sentence length: Formal English uses longer, more complex sentences. Informal English breaks thoughts into shorter, punchier sentences.
Closings: "Kind regards" or "Yours sincerely" becomes "Thanks" or "Cheers"
Mixing the Styles (Semi-Formal)
Most of the time, people use a style that is in the middle: Semi-Formal. This style is polite but still friendly and easy to read. It is the best choice for most emails today.
Formal Part: Use good grammar and polite words.
Informal Part: Use contractions ("I'll," "we're") and a friendly closing.
Semi-formal version: Dear Mr. Thompson, I’m writing regarding the project deadline. Due to some unexpected delays in receiving the client's feedback, we’ll require an extra week to complete the final revisions. We plan to deliver the project by March 30th. Please let me know if this extended deadline works for you, and thank you for your understanding. Best regards, Sarah
What changed
Greeting/Closing: Used "Dear Mr. Thompson" (Formal) but shifted to "Best regards" (More common and less stiff than "Kind regards").
Contractions/Phrasing: Used contractions but different phrasing ("we’ll require" instead of "we're going to need") and used slightly softer language ("some unexpected delays").
Directness: The language is polite but skips the lengthy apology of the formal version, making it more concise.
Conclusion
Learning to use the right style in business is about knowing your situation. Formal English is safe and polite, but informal English helps build good work relationships. The key is to be able to use both styles as well as the semi-formal style so as to make your message strong and clear every time.