One Day Sick Leave Application — 6 Ready-to-Use Samples (2026)

One-day sick leave is the most frequently applied leave in Indian workplaces and schools. Here are six ready-to-use samples covering every common scenario — formal office email, casual WhatsApp message, school student letter, parent letter, college email and college short application.

Sample 1 — Formal office email

Subject: Sick Leave Application for Today — [Your Name]. Dear [Manager Name], I am writing to inform you that I am unwell today due to acute viral fever and headache. I will not be able to attend office. I am applying for one day of sick leave on [date]. I will check critical emails as my health permits. The medical certificate will follow by evening. Regards, [Your Name].

Sample 2 — Short WhatsApp message to manager

"Good morning [Manager]. I am running a high fever and cannot come to office today. Please consider this as my sick leave for [date]. I will share the medical certificate by evening. Thanks."

Sample 3 — School student leave letter

To, The Class Teacher, Class [VIII-B], [School Name]. Respected Madam, I am suffering from high fever and stomach ache since this morning. Kindly grant me leave for today, [date]. I will catch up on notes tomorrow. Thanking you. Yours obediently, [Name]. Roll No. [12]. Class [VIII-B].

Sample 4 — Parent letter for school child

To, The Class Teacher, Class [V-A], [School Name]. Respected Madam, My daughter [Name] is suffering from fever and is unable to come to school today, [date]. Kindly grant her leave for the day. She will rejoin tomorrow. Thanking you. Yours sincerely, [Parent's Name]. Mobile: [Number].

Sample 5 — College email to HOD

Subject: One-day sick leave application — [Name] — [Roll No.]. Dear Sir/Madam, I, [Name], a student of [Programme/Year], request a one-day sick leave for [date] due to acute viral fever. I have consulted the doctor and will submit the medical certificate tomorrow. Kindly grant leave. Thanking you. Sincerely, [Name]. Roll No. [123456].

Sample 6 — Casual chat to HR portal

"Applying sick leave for today through HRMS. Reason: viral fever with body ache. Will share medical certificate on return tomorrow. Please approve."

Pro tips for one-day leave

Inform your manager at the earliest opportunity (preferably before your shift starts). State a specific reason — "viral fever" is more credible than "not feeling well". Mention you will catch up on critical work. Provide a doctor's consultation receipt or medical certificate on return even for one day, as some HR policies require it.