Good [morning/afternoon] [Principal/Admin Name],
I'm writing to let you know that I will be absent on [date] due to [illness / personal / professional reason; keep brief].
Sub plans are [attached to this email / located in [specific place] on my desk]. My classes are [Periods 1–5 / list specific times], and the plans include materials, seating charts, and clear instructions for the substitute.
Please let me know if you need anything else from me. I expect to return on [return date].
Thank you,
[Your Name]
[Room Number] | [Subject(s)]
Replace the bracketed placeholders with your own details before sending. Save your finished version somewhere easy to find so you can reuse it next year.
How to use this email
When to send it
As soon as you know. For illness that usually means the night before, or before dawn, which is miserable and still better than the alternative.
This email is almost never your first step. Most districts run absences through some automated system, a phone line or an online portal, and that system is what actually pulls a sub. Log it there first, then send this. Check your handbook for the cutoff time; every district sets its own, and missing it is how your classes end up split across the hall. This message is the human layer on top, telling your principal that a person is out and that plans exist.
What to change before you send
- Say less about why, not more. "Due to illness" is a complete reason. A detailed medical account in a work email invites follow-up questions you would rather not answer.
- Be exact about where the plans are. "On my desk" fails at 6:40 in the morning when a sub is standing in a dark room. "Red folder, left side of my desk, also attached here" works.
- List what is not on your schedule. Morning duty, the co-taught block, the student who goes to the nurse at eleven. That is what actually falls apart while you are gone, not the lesson.
- Copy whoever really handles coverage. In a lot of buildings that is a secretary or a department chair rather than the principal. Ask someone in your hallway who has been there a while.
- Cut the return date if you do not know it. A wrong "I expect to be back Thursday" is worse than "I will update you tomorrow morning."
What a good reply looks like
Usually a one-line acknowledgment, sometimes nothing at all. Nothing is normal here. This email is documentation more than conversation, and most of its value is that it sits in your sent folder with a timestamp on it.
The reply that matters is the one telling you no sub was found. It happens, and it means colleagues are giving up planning periods to cover you. If you get it, strip your plans down to one page a stranger can run cold: bell work, one task, one clear way to end class.
If you end up out longer than you said, send a fresh short note instead of letting the first one stretch. "Still out tomorrow, Thursday plans attached" takes ten seconds and keeps your name out of the office's unknown column.