Supply costs are one of the biggest variable lines on a school's budget — and one of the easiest to overspend on. With teacher absence still elevated post-pandemic and SEN demand rising, the question for school business leaders isn't 'should we use supply?' but 'how do we use it well?'. Here's how to lower supply spend in 2026 without compromising on cover quality.
1. Consolidate to a preferred-supplier list
Schools that use 6+ agencies pay more, get inconsistent quality, and waste hours managing relationships. Cut your list to 1–3 agencies, agree clear rate cards, and reward those agencies with volume in exchange for priority access and preferential pricing.
2. Negotiate transparent rate cards
Ask your agency for a written rate card showing: cost to school, gross pay to teacher, agency margin and any extras (overtime, AWR uplifts). Transparency forces fair pricing and removes nasty surprises mid-term.
3. Plan ahead for predictable absence
PPA, CPD and known parental leave are predictable. Booking the same long-term supply teacher for a recurring weekly slot is cheaper, smoother and better for children than a different face every Friday. Your consultant can build a forward-booking plan.
4. Use cover supervisors for short-term cover
For pre-set lessons, a behaviour-trained cover supervisor is typically 30–40% cheaper than a qualified teacher and equally effective. Save your supply-teacher budget for long-term and SEN cover where the qualified expertise really matters.
5. Try-before-you-hire for permanent vacancies
If you have a permanent vacancy starting next term, run it as a long-term supply assignment first. You see the teacher in your classroom before committing, and most reputable agencies will convert the placement to permanent for a transparent fee — often lower than a standard recruitment retainer.
6. Push back on opaque mark-ups
If an agency won't tell you their margin, that's your answer. Ethical agencies will share it because they know they're competitive. Average agency margin in education is around 25–35% above the teacher's gross day rate; significantly above that should prompt a conversation.
Talk to a consultant
GAC Education works with schools across West Yorkshire, Merseyside and Cheshire on transparent, predictable supply arrangements. Get in touch for a no-obligation review of your current spend.