How to write a letter still matters in 2026: school offices, banks, newspapers, and some UK employers still want paper or a PDF that looks like a letter, not a chat.

Students in India search how to write a letter to principal, how to write a letter for bonafide certificate, and transfer certificate (TC) requests every exam season. In the US and UK, the same skill shows up as a letter of interest, a complaint letter, or a reference request.

This KnowAnt manual covers how to write a letter in English without mixing formal and informal rules. At KnowAnt, we keep the structure tight, then you polish grammar with the grammar checker. If the “letter” is actually going in Gmail, use how to write a professional email instead.

Table of Contents

• What Is a Letter?
• Formal vs Informal Letter
• Formal Letter Format (Steps)
• Examples and Templates
• Common Mistakes
• Frequently Asked Questions
• Conclusion

What Is a Letter?

A letter is a complete message with sender details, date, recipient, greeting, body, and a sign-off. Unlike a paragraph in an essay, a letter has an addressee and a purpose the office can file.

Dates: US often uses September 3, 2026. India and the UK commonly use 3 September 2026 or 03/09/2026 (day first — do not mix with US month-first dates on bank forms).

UK note: a letter of interest (sometimes called a prospecting letter) tells an organisation you want to work there even if no vacancy is advertised. Keep it to one page: who you are, why them, what you offer.

Formal vs Informal Letter

Yours faithfully is used in many Indian/UK school books when you started with Sir/Madam (no name). Yours sincerely when you used a name. US letters often use Sincerely either way.

Formal Letter Format (Steps)

Formal letter format for school and offices:

1. Your address (top left or as your school requires)
2. Date
3. Recipient’s designation and address (The Principal, [School], [City])
4. Subject: one line (mandatory in Indian school format)
5. Salutation (Respected Sir/Madam or Dear Mr Khan)
6. Body: reason → facts → request → thanks
7. Complimentary close + signature + name + class/roll if a student

Keep the body to three short paragraphs. One request per letter. If you need a CV-style document for jobs, that is a cover letter, not a school application. Parents asking for a child’s absence should use a leave application for school from parents, not a student essay.

Examples and Templates

1. Letter to the principal (TC — India)

[Your address] · 3 September 2026
To The Principal, [School], [City]
Subject: Request for Transfer Certificate

Respected Sir/Madam,

I am [Name], Class 10-B, Roll No. [xx]. My family is relocating to Pune in October 2026. Please issue my Transfer Certificate and character certificate. Library dues are cleared; kindly confirm any remaining fees.

Yours faithfully,
[Name], Class 10-B

2. Letter for bonafide certificate

Subject: Request for bonafide certificate — passport / bank KYC

Respected Sir,

I am [Name], Class 12-A. I need a bonafide certificate stating that I am a regular student, for bank KYC / passport (delete as needed).

Please issue the certificate on school letterhead. I can collect it from the office on [date].

Yours faithfully,
[Name]

3. Letter to the editor

Subject: Unsafe crossing near [School] gate during dismissal

Sir,

Each afternoon, two-wheelers cut across the zebra crossing outside [School]. Parents and students have no clear gap to cross.

I request the civic body to post a marshal from 2:00–3:00 p.m. and repaint the crossing. This is a safety issue, not a one-day complaint.

Yours faithfully,
[Name], [Locality]

4. Letter to the bank manager

Subject: Request to update registered mobile number — A/c [xxxx]

Dear Sir/Madam,

I hold savings account [number] at your [branch]. Please update my registered mobile number to [new number]. I enclose a copy of my ID as required.

Yours sincerely,
[Name]

5. Informal: letter to a friend

3 September 2026 — Dear Aisha, I finished the science project. The volcano leaked on camera, but the write-up is done. Write when exams end — we should book the train before fares jump. Take care, Meera.

Common Mistakes

• Mixing informal letter slang into a principal application.
• No Subject line in Indian school formal letters (easy marks lost).
• Vague requests: “Please do the needful” with no document named.
• Wrong date order on bank letters.
• Writing a novel; offices scan for the ask.

Need a tighter first paragraph? See how to write a strong introduction paragraph. Short school notes use message writing format.

Frequently Asked Questions

How do I write a letter to the principal?

Use school formal letter format: your details, date, The Principal, subject, three paragraphs (reason, facts, request), Yours faithfully.

How is a letter to the editor different?

You write for publication. Open with the issue, add one local fact, end with a practical ask. Stay civil; insults get spiked.

Can I email the same text?

Yes, but drop the postal address block. Put the subject in the email subject field. See our professional email guide.

Conclusion

How to write a letter is layout plus one clear request. Formal letters serve offices; informal letters serve people you already know.

Draft on KnowAnt, check the subject line, and keep dates consistent for US, India, or the UK.