Writing a clear, effective letter is still one of the most useful communication skills you can have—whether you’re sending a formal business letter, a personal letter to a friend, or a professional email.

This guide walks you through:

  • The basic structure of a letter
  • How to write a formal vs informal letter
  • Professional letter examples and templates
  • Common phrases and closing lines
  • Practical tips to sound clear, polite, and confident

1. Decide: Formal or Informal Letter?

Before you start, clarify who you’re writing to and why.

Formal letters (professional or official)

Use a formal letter when writing to:

  • A company or organization
  • Someone you don’t know well
  • A manager, HR department, school, bank, or government office

Typical uses:

  • Job application / cover letter
  • Complaint or request
  • Resignation letter
  • Reference or recommendation letter

Tone: polite, respectful, and structured.
Avoid slang, emojis, or casual abbreviations.

Informal letters (personal or friendly)

Use an informal letter when writing to:

  • Friends
  • Family members
  • Close colleagues or people you know well

Typical uses:

  • Catching up or sharing news
  • Thank-you letters
  • Invitations

Tone: warm, relaxed, and natural.
You can use contractions (I’m, you’re), casual phrases, and personal stories.

2. Standard Letter Structure (Simple Overview)

Most letters—formal or informal—follow this basic order:

  1. Sender’s address (and contact info)
  2. Date
  3. Recipient’s name and address (mainly for formal letters)
  4. Greeting / salutation
  5. Opening paragraph – why you’re writing
  6. Body – details, explanation, or information
  7. Closing paragraph – what you want next / final message
  8. Sign-off / closing phrase
  9. Your name and signature

For emails, you usually skip the full postal addresses and use:

  • Subject line
  • Greeting
  • Body
  • Closing phrase and your name
  • Contact details in your email signature

3. How to Write a Formal Letter (Step by Step)

3.1 Layout of a formal letter

Use a clean, simple layout:

  • Font: Arial, Calibri, Times New Roman (10–12 pt)
  • Align everything to the left
  • Use clear spacing between sections

3.2 Formal letter format example

Below is a typical business letter format you can adapt:

[Your Name]  
[Your Street Address]  
[City, State/Province, ZIP/Postal Code]  
[Country]  
[Email Address] | [Phone Number]

[Date: Month Day, Year]

[Recipient’s Name]  
[Recipient’s Job Title]  
[Company or Organization Name]  
[Street Address]  
[City, State/Province, ZIP/Postal Code]  
[Country]

Dear [Mr./Ms./Dr. Last Name],   ← Use a title + last name

Opening paragraph: Clearly state why you are writing.
Example: I am writing to apply for the position of Marketing Assistant, as advertised on your company website.

Body paragraphs: Provide details in a logical order.
- Give background information
- Explain what you want, what happened, or what you can offer
- Use clear, short paragraphs

Closing paragraph: Summarize and state the next step.
Example: I would welcome the opportunity to discuss my application in more detail and am available for an interview at your convenience.

Yours sincerely,   ← If you know their name
[Your handwritten signature, if printed]
[Your Typed Name]
[Optional: Your Job Title]

If you don’t know the person’s name, you can use:

  • Dear Sir or Madam, or
  • To Whom It May Concern,

Then close with:

  • Yours faithfully,

4. Example: Formal Letter of Request

Alex Johnson  
14 Greenfield Avenue  
London W1 5AB  
United Kingdom  
[email protected] | +44 1234 567890

February 10, 2025

Customer Support Department  
BrightWave Internet Ltd.  
22 King Street  
London EC1A 1AA  
United Kingdom

Dear Sir or Madam,

I am writing to request a detailed statement of my broadband account for the period of January 2024 to December 2024.

I have been a customer of BrightWave Internet Ltd. since 2020 under account number BW-483920. I require this statement to verify several payments and to provide supporting documentation for my tax records.

I would be grateful if you could email the statement to me at the address provided above or post it to my home address at your earliest convenience. If there are any charges for this service, please inform me in advance.

Thank you for your assistance. I look forward to your prompt response.

Yours faithfully,

Alex Johnson

5. How to Write an Informal Letter (Friendly or Personal)

Informal letters are more relaxed, but it still helps to follow a structure.

5.1 Informal letter structure

You can include:

  • Your address (optional)
  • Date
  • Greeting
  • Introduction
  • Body (stories, news, questions)
  • Closing line
  • Friendly sign-off

5.2 Informal letter format example

[Your Address – optional]  
[City, Country – optional]

[Date]

Hi [First Name], / Dear [First Name],

Opening: Ask about them or react to their last message.
Example: I hope you’re doing well and settling into your new job!

Body: Share your news, feelings, or stories.
- What has happened recently
- Plans for the future
- Questions about their life

Closing: End warmly and look forward.
Example: I can’t wait to hear how everything is going in your new city.

Best wishes, / Take care, / Lots of love,  
[Your First Name]

6. Example: Informal Letter to a Friend

March 2, 2025

Hi Sarah,

I hope you’re doing well and that the move to Toronto went smoothly. It feels strange not seeing you at our usual coffee spot every Friday!

Things here are pretty much the same. Work has been busy, but in a good way. We’ve just started a new project, and it reminds me of the late nights we spent on the Johnson report last year. I definitely miss having you on the team.

I’m planning to visit Canada later this year, probably in October. It would be amazing if we could meet up while I’m there. Let me know which weekends might work best for you.

Anyway, I don’t want to make this too long for an email you’ll probably read on your lunch break. Just wanted to say that I miss you and I’m really proud of you for taking this big step.

Take care and write back when you have a moment.

Lots of love,  
Emma

7. How to Start a Letter: Effective Openings

7.1 Formal letter openings

Use a clear, direct first sentence:

  • “I am writing to inquire about…”
  • “I am writing to apply for the position of…”
  • “I am writing to express my dissatisfaction with…”
  • “I am writing in response to your advertisement dated…”
  • “I am writing to request information about…”

7.2 Informal letter openings

Sound natural and personal:

  • “I hope you’re doing well.”
  • “It was great to hear from you!”
  • “I’m so sorry it’s taken me so long to write back.”
  • “You won’t believe what happened last week…”
  • “I’ve been meaning to write to you for ages.”

8. How to End a Letter: Closings and Sign-offs

8.1 Formal letter closings

Use a polite final paragraph:

  • “Thank you for your time and consideration.”
  • “I look forward to your response.”
  • “Please let me know if you require any further information.”
  • “Thank you in advance for your assistance.”

Then choose an appropriate sign-off:

  • Yours sincerely, (if you used their name)
  • Yours faithfully, (if you didn’t know their name)
  • Kind regards, / Best regards, (slightly less formal, common in email)

8.2 Informal letter closings

End in a warm, friendly way:

  • “Write back soon and tell me all your news.”
  • “Can’t wait to see you.”
  • “Thanks again for everything.”

Sign-offs for informal letters:

  • Best,
  • Best wishes,
  • Take care,
  • Lots of love,
  • See you soon,

9. Writing a Letter vs Writing an Email

Most email etiquette is similar to letter etiquette, especially in professional settings. Main differences:

  • No need for full postal addresses
  • Always include a clear subject line
  • Be shorter and more direct
  • Avoid large blocks of text—use short paragraphs and bullet points

Example subject lines:

  • “Application for Marketing Assistant – Alex Johnson”
  • “Request for Account Statement – Account BW-483920”
  • “Meeting Request – Project Timeline Discussion”

For more on email style, see resources like Purdue OWL’s Professional Email Guidelines.

10. Common Types of Letters (With Tips)

10.1 Job application / cover letter

Focus on:

  • The job you’re applying for
  • Your most relevant skills and achievements
  • Why you’re a good fit

Helpful guide: Indeed – How to Write a Cover Letter.

10.2 Complaint letter

Keep it calm, factual, and specific:

  • What happened
  • When and where
  • Why it’s a problem
  • What you would like them to do (refund, replacement, apology, etc.)

10.3 Resignation letter

Be brief, polite, and professional:

  • State that you are resigning
  • Give your final working date
  • Thank your employer for the opportunity

Example closing:
“I have appreciated the opportunities for professional and personal development that you have provided during my time at the company.”

10.4 Thank-you letter

  • Mention exactly what you are thankful for
  • Explain how it helped you or made you feel
  • Keep the tone warm and sincere

11. Style Tips to Improve Any Letter

Use these simple writing tips to make your letters stronger:

  1. Be clear and specific

    • Instead of: “I need some documents.”
    • Use: “I would like to request copies of my bank statements from January to March 2024.”

  2. Use short paragraphs

    • Each paragraph should focus on one main idea.
    • This makes your letter easy to read and understand.

  3. Avoid overly complex language

    • You don’t need big words to sound professional.
    • Aim for simple, correct, and polite.

  4. Check grammar and spelling

    • Use tools like Grammarly or your word processor’s spell check.
    • Read the letter out loud to catch awkward sentences.

  5. Match the tone to the situation

    • Formal letters: no slang, limit jokes, stay respectful.
    • Informal letters: be yourself, but still be clear.

  6. Be polite, even when complaining

    • Avoid insults or emotional language.
    • Focus on the problem and the solution you want.

12. Quick Templates You Can Reuse

12.1 Simple formal request template

[Your Name]  
[Your Address]  
[Email] | [Phone]

[Date]

[Recipient’s Name]  
[Recipient’s Position]  
[Company/Organization]  
[Address]

Dear [Title + Last Name],

I am writing to [clearly state your main purpose in one sentence].

[Explain the background or context briefly in one or two paragraphs.]

I would be grateful if you could [state exactly what you would like them to do]. Please let me know if you need any additional information.

Thank you for your time and assistance.

Yours sincerely,

[Your Name]

12.2 Simple informal “catching up” template

[Date – optional]

Hi [First Name],

I hope you’re doing well. It feels like such a long time since we last talked!

[Share your news: work, family, studies, travel, etc.]

[Ask questions about their life to keep the conversation going.]

Anyway, I just wanted to say hello and let you know I’ve been thinking of you. Write back when you have a moment—I’d love to hear how you’re doing.

Take care,

[Your First Name]

13. Final Checklist Before Sending Your Letter

Before you hit “send” or drop your letter in the mail, quickly check:

  • Have I stated my purpose clearly in the first paragraph?
  • Is my tone appropriate (formal or informal)?
  • Are names, dates, and numbers correct?
  • Is my contact information included if a reply is needed?
  • Have I used a suitable greeting and sign-off?
  • Have I checked spelling and grammar?

If you follow this structure and checklist, you’ll know how to write a letter that is clear, respectful, and effective—whether it’s for work, school, or personal life.

If you tell me what type of letter you need (for example: job application, complaint, invitation, or apology), I can help you create a tailored, ready-to-use version.