Leave application format for school and office, with sick leave samples

Try it

Say who it's going to, which days you'll be away and why. The button opens a chat with a sick leave request already filled in, so you can swap in your own dates before you send it.

A leave application is one of the first formal letters most of us write, usually to a class teacher, and later as a sick leave application to a manager or HR. Whoever reads it wants three things fast: who you are, which days you'll miss, and why. Everything else in the format exists so they can find those three things without reading twice.

Below is the layout schools and offices in India expect, then five short samples you can copy: sick leave for school, sick leave for office, casual leave, a half day and a family function.

The format has seven parts, in a set order

Schools teach the leave application as a formal letter, with its parts in a set order. CBSE's Class 10 English paper asks for a formal letter in 100 to 120 words (CBSE syllabus 2025-26) and gives one of its five marks to format alone (CBSE marking scheme 2025-26). An earlier CBSE marking scheme spells the format out: sender's address, date, receiver's address, subject and salutation, the letter, then the closing (CBSE marking scheme 2022-23). All three were checked on 30 October 2026. A paper letter to an office can follow the same order; an email keeps only the subject, salutation, body and closing (more on that below).

1. Your address. At the top: your home address (school), or your name, role and company (office).
2. Date. Written out in full, such as 2 November 2026, so nobody misreads it.
3. To. The reader's title and the school or company: The Principal, Sunrise Public School, Pune.
4. Subject. One line that says what you want and when: Application for sick leave on 3 and 4 November. CBSE accepts it before or after the salutation.
5. Salutation. Respected Sir/Madam for a principal, Dear Ms. Rao for a manager you know.
6. Body. Two or three lines: who you are, the dates, the reason, and what you'll do about the work you miss.
7. Closing and name. Yours sincerely or Yours faithfully (Regards is fine in an office email), then your name, your class and roll number for school, and your signature on a paper copy.

The subject line does most of the work. A teacher or manager who reads only that line should already know the dates.

Sick leave application for school

14 Shanti Nagar
Pune

2 November 2026

To
The Principal
Sunrise Public School, Pune

Subject: Application for sick leave on 3 and 4 November

Respected Sir/Madam,

I am Aarav Mehta of Class 8 B. I have had a high fever since last night, and the doctor has advised two days of rest. I request leave for 3 and 4 November 2026. I will collect the notes I miss from my classmates.

Yours sincerely,
Aarav Mehta
Class 8 B, Roll No. 14

For a younger child, a parent writes the same letter in their own name: "My son Aarav Mehta of Class 8 B has had a high fever...". Some schools also ask for a note in the school diary, so check what yours expects.

Sick leave application for office

Rohan Iyer
Customer Support Executive, Brightline Services

2 November 2026

To
Ms. Kavya Rao
Manager, Customer Support

Subject: Sick leave on 3 and 4 November

Dear Ms. Rao,

I have had a fever since last night and the doctor has advised two days of rest, so I won't be able to work on 3 and 4 November. Neha has agreed to cover my open tickets, and I have shared the list with her. I'll be back on 5 November.

Regards,
Rohan Iyer

In an office letter, say who covers your work and when you're back. If your leave runs past the number of days your company allows without proof, you may need a medical certificate. That number differs between employers, so check your leave policy or ask HR rather than guessing.

Casual leave, a half day and a family function

These can be short. Keep the subject line, the dates and one reason.

Casual leave. Subject: Casual leave on 13 November. "I need to take casual leave on 13 November 2026 for a personal errand at the bank. My work for that day is done, and Priya has the handover note."

Half day. Subject: Half-day leave on 20 November, from 1 pm. "I need to leave at 1 pm on 20 November 2026 for a doctor's appointment. I'll finish the weekly report before I go."

A family function. Subject: Leave from 27 to 29 November for my sister's wedding. "I request leave from 27 to 29 November 2026 to attend my sister's wedding in Jaipur. I'll be back on 30 November, and the handover is with Arjun."

For a date you know ahead of time, like a wedding, check how much notice your leave policy asks for, and apply as soon as you know the dates.

Email, letter or WhatsApp: use the channel your rules name

Which channel counts is set by your school or employer, not by the format. Some schools want a signed paper application or a note in the school diary; some offices want an email, a phone call or an entry in an HR system. Your school handbook or company leave policy says which one, and if it doesn't, ask once and use that every time.

If the channel is email, the parts above still apply: the subject line becomes the email subject, and the address, date and To lines come from the email itself. If you message your manager first, on WhatsApp or anywhere else, still file the leave through the channel your policy names, because that is the one that gets recorded.

What askROI made from the Try it prompt

We sent the Try it prompt as written. askROI handed back a one-page Word file, Sick_Leave_Application_MK_Dev.docx, and the same letter as plain text to paste into an email. askROI counted about 84 words with the subject line, under the 120 the prompt allowed:

It's written as an email: subject, salutation, the dates and reason in the first paragraph, and a formal closing. It has no address block or date at the top, so if you're printing it, add those in the order above, or ask for them in the same chat. The file opens in askROI, where you can edit it or ask for changes, such as putting your manager's name in place of "Sir/Madam", and then download it. For longer documents, the AI document generator works the same way.

A good leave application is short on purpose. Get the subject line right, put the dates in the first two lines, and say how the work gets covered. The person reading it can then approve it in a few seconds.