What Is a Supply Teacher? A Complete Guide for 2026

What is a supply teacher?

A supply teacher is a qualified teacher who covers classes in UK schools when the permanent teacher is unavailable — whether for a single day, a few weeks, or an entire term. They step in to keep learning on track, follow the lesson plans left for them, and maintain the classroom routine pupils are used to.

Schools rely on supply teachers to handle planned absences (training, parental leave, long-term illness) and unplanned ones (sickness, emergencies). For pupils, a good supply teacher means the school day continues with minimal disruption.

What does a supply teacher actually do?

• Delivers pre-planned lessons set by the absent teacher or department.
• Manages the classroom — behaviour, transitions, safeguarding, and pastoral care.
• Marks work and leaves feedback for the returning teacher.
• Adapts on the fly, often arriving with little notice and limited context.
• Follows the school's policies on behaviour, safeguarding and SEND from day one.

Types of supply teaching

Day-to-day (daily) supply

Short-notice bookings, often confirmed the evening before or the morning of. Ideal for teachers who want flexibility and variety across different schools.

Short-term supply

Bookings of a few days to a few weeks, typically covering illness, training, or a specific project. You'll get to know the class and pick up some planning.

Long-term supply

A term or more in the same school, usually covering maternity leave or long-term absence. Often involves full planning, marking, parents' evenings and reports — similar to a permanent role, but on a temporary contract.

Supply through a partner vs directly

Most supply teachers work through an education partner like Humly, which handles compliance, school relationships and pay. Some work directly with a single school on a casual contract.

What qualifications do you need?

• QTS (Qualified Teacher Status) for most mainstream roles — gained via a PGCE, School Direct, Teach First or equivalent route.
• An enhanced DBS check on the Update Service.
• Right to work in the UK and references covering the past two years.
• Safeguarding and Prevent training, refreshed annually.

Unqualified roles (cover supervisor, teaching assistant, HLTA) are also available if you don't yet have QTS — a common route for ECTs and career changers.

How much do supply teachers earn?

Daily rates vary by region, phase (primary or secondary), subject and experience. London rates are typically higher than the rest of the UK, and shortage subjects like maths, physics and computing often command a premium. For current figures, see our guide to supply teacher pay rates in the UK.

The pros and cons of supply teaching

Why teachers choose it

• Flexibility to choose when and where you work.
• No planning, marking or reports on day-to-day bookings.
• Exposure to different schools, age groups and leadership styles.
• A lower-pressure way back into the classroom after a break.

What to be aware of

• Income can vary week to week, especially around school holidays.
• You may walk into unfamiliar classes with little notice.
• Behaviour management matters — you're the new face in the room.

Is supply teaching right for you?

If you enjoy variety, value flexibility, and are confident managing a classroom without weeks of prep, supply teaching can be a genuinely rewarding way to teach. It also suits ECTs building experience, semi-retired teachers, and those balancing teaching with study, family or other work.

How to get started

The fastest route is to register with an education partner that vets you once and then matches you to schools in your area. Our step-by-step walkthrough covers everything from QTS to your first booking: How to become a supply teacher in the UK.

If you're ready now, you can register with Humly and start receiving bookings from schools in your area.