Supply Teacher Pay Explained (Agency vs Direct)

Two very different jobs that can look identical from the front of the classroom

"Supply teaching" covers two structurally different employment arrangements that happen to produce the same thing in a classroom: a qualified teacher, in front of a class, covering a lesson. Everything else — who employs you, how you're paid, whether you build up a Teachers' Pension, what happens if the booking suddenly ends, and what rights you accumulate over time — depends entirely on which of the two arrangements you're in.

The first is agency supply: a recruitment agency finds you bookings at one or more schools, and — in the vast majority of cases — you are paid not by the agency directly and not by the school, but by a separate umbrella company that formally employs you as its worker. The second is direct or long-term supply: the school itself employs you, on its own payroll, usually on a fixed-term contract or a genuinely casual day-to-day basis, with no agency or umbrella company anywhere in the chain.

It's tempting to think of these as "the same job, paid slightly differently." They aren't. They are two different employment relationships with different employers, different tax and National Insurance mechanics, different pension outcomes, and different accumulated rights. Understanding which one you're in — and exactly how the money moves through the chain in the agency case — is the single most useful thing a supply teacher can do to avoid being quietly short-changed or simply confused by their own payslip.

How agency supply and umbrella company pay actually works

When a school needs supply cover, it typically contacts one or more recruitment agencies rather than advertising the role itself. The agency finds an available, suitably qualified teacher — you — and agrees a price with the school for that placement. That price is usually called the assignment rate (sometimes referred to as the "charge rate" or simply the rate the agency bills the school). This is the figure that funds everything downstream: the umbrella company's costs, statutory deductions, the umbrella's margin, and, eventually, your own pay.

Crucially, the assignment rate is not your gross pay, and it is very much not your take-home pay. A chain of deductions happens between the school agreeing to pay the assignment rate and you seeing a number land in your bank account, and almost none of it is obvious from the headline day rate an agency advertises when trying to recruit you.

Step 1 — the umbrella company receives the assignment rate

The agency pays the assignment rate to the umbrella company (or the umbrella company invoices the agency for the hours or days worked, depending on the exact contractual chain). This total sum has to cover everything that follows — it is the entire pool of money available for your employment costs and your wage.

Step 2 — employer National Insurance and the Apprenticeship Levy come out first

Because the umbrella company is your legal employer, it — not the school, and not the agency — is responsible for paying employer National Insurance contributions on your earnings, plus a small Apprenticeship Levy contribution that applies to employers with a sufficiently large UK payroll (umbrella companies, processing many workers' pay, are typically well above this threshold). Both of these are calculated from the assignment rate and deducted before anything else happens. Many teachers never see this step spelled out, which is exactly why the headline day rate looks so much bigger than what actually reaches them.

Step 3 — the umbrella company's margin (its fee for running your payroll)

The umbrella company then deducts its own margin — its fee for administering your PAYE employment, providing a contract of employment, handling holiday pay accrual, pension auto-enrolment administration, and payroll compliance. Margins vary between providers and are usually charged as a flat fee per pay period rather than a percentage, though the exact structure differs by provider — always ask for this in writing rather than assuming a figure.

Step 4 — only now is your gross pay calculated, as the umbrella's employee

What's left after employer NI, the Apprenticeship Levy contribution and the umbrella's margin becomes your gross pay as an employee of the umbrella company. From this figure — and only from this figure — your own employee National Insurance, income tax under PAYE, and, if you haven't opted out, your employee pension contribution under auto-enrolment are deducted in the normal way any employee's payslip works. What's left after all of that is your actual net take-home pay.

Worked illustrative example: from assignment rate to take-home pay

The figures below are entirely illustrative, rounded for clarity, and do not represent any real agency, umbrella company or current statutory rate — they exist purely to show the shape of the waterfall, not to predict what you'd actually be paid.

Notice the gap between the £180 figure that might be quoted to you informally as "the rate" and the roughly £113 that actually reaches your account in this illustration — a difference driven almost entirely by deductions that happen before your own payslip even starts, not by unusually high personal tax. This is exactly why comparing agencies purely on the day rate they quote can be misleading, and why asking for an estimated net figure matters more than the headline number.

Pension eligibility: the gap most supply teachers don't know exists

This is arguably the single most consequential — and most poorly understood — difference between agency supply and direct employment. Teachers employed directly by a school on the STPCD or equivalent terms are normally eligible for the Teachers' Pension Scheme (TPS), a valuable defined-benefit-style career average scheme with a substantial employer contribution. Agency supply teachers, paid via an umbrella company, generally are not automatically enrolled in the TPS at all.

This isn't an oversight or unfairness on the umbrella company's part — TPS access is restricted to specific categories of employer and employment, and a general umbrella company employing workers across many sectors typically isn't one of them. What the umbrella company is legally required to do is comply with standard UK workplace pension auto-enrolment law, which means enrolling you into a standard defined-contribution workplace pension scheme (assuming you meet the age and earnings criteria), unless you actively opt out.

If TPS continuity matters to you — for example, because you're already an active or deferred TPS member from a previous permanent role and want to avoid a long gap in contributions, or because retirement planning around the TPS is a priority — it's worth specifically asking any agency: "Does this booking, or your framework more generally, offer access to the Teachers' Pension Scheme, or only a standard workplace pension?" The answer varies by agency, by framework, and sometimes by the specific local authority or trust the placement is with, so treat it as a question to ask fresh each time rather than something you can assume carries over from a previous booking.

Direct and long-term supply: employed by the school, not an agency

The alternative route is being booked directly by a school onto its own payroll — sometimes called long-term supply, direct supply, or simply being taken on as a day-to-day or fixed-term member of staff without an agency in the chain at all. Some schools maintain their own pool of known, trusted supply teachers they contact directly rather than going through an agency for every absence.

Financially, this is usually the better arrangement for the teacher, for a straightforward reason: there's no umbrella company margin, no employer National Insurance and Apprenticeship Levy deduction sitting between the school's budget and your pay, because the school is simply paying you directly as it would any other member of staff. You are also normally eligible for the Teachers' Pension Scheme in the same way as a permanent teacher at that school (subject to the usual eligibility rules), and holiday pay or term-time-only pay treatment generally follows the same normal patterns as other school staff, rather than the accrual-based approach common with umbrella companies.

The trade-off is flexibility. Agency supply exists precisely because it lets a teacher pick up ad hoc bookings at short notice across multiple schools, choose which days to work, and decline bookings without notice obligations in the way an ongoing contract might require. Direct or long-term supply usually means committing to a single school for a defined period — a term, a half-term, or until a specific member of staff returns — which suits some teachers far better than others depending on their circumstances.

Rights and continuity: the Agency Workers Regulations and continuous service

Agency workers, including supply teachers, are covered by the Agency Workers Regulations 2010. From day one of an assignment, you're entitled to the same access as directly-employed staff to certain collective facilities (such as a staff canteen or car parking) and to be informed of relevant vacancies. The more significant protection, though, applies after 12 continuous calendar weeks in the same role with the same hirer (the same school, doing substantially the same job): from that point, you become entitled to the same basic working and employment conditions — including pay — as you would have received if you had been recruited directly by the school for that role.

This is a genuinely valuable and widely under-known protection for supply teachers who return repeatedly to the same school in the same kind of role, but it's easy to lose the benefit of it without realising: the 12-week qualifying period is specific to a continuing role with the same hirer, so moving between different schools frequently — even through the same agency — generally resets the clock each time.

Separately, "continuous service" (or the lack of it) affects broader statutory employment rights, such as unfair dismissal protection and statutory redundancy pay eligibility, which typically require a minimum period of continuous service with a single employer to accrue. Agency supply, by its ad hoc nature, often doesn't build continuous service with any single employer in the way a permanent contract does — another reason the two routes aren't simply interchangeable versions of the same job.

Comparing agency-via-umbrella supply and direct/long-term supply

Questions to ask an agency before accepting a booking

A short set of direct questions, asked before you accept a booking rather than after your first payslip, can save a lot of confusion and a lot of money:

• What is the assignment rate for this booking, and separately, what net pay should I expect to actually receive?
• Which umbrella company will process my pay, and what is its margin or fee structure?
• Will I be auto-enrolled into a workplace pension, and is it a standard defined-contribution scheme or does this booking offer Teachers' Pension Scheme access?
• How is holiday pay calculated and paid — rolled into my rate, or paid separately, and how often?
• Can I see a key information document or a sample payslip breakdown before I accept?
• Is there a minimum notice period if I need to end the booking, or if the school ends it early?
• Will this booking be recorded as continuing in the "same role" for Agency Workers Regulations purposes if I'm asked back to the same school repeatedly?
• Are there any fees charged to me directly, separate from the umbrella company's margin already reflected in my pay?

Tax, National Insurance and the "same job, different payslip" confusion

Because an umbrella company is a genuine PAYE employer, your income tax and employee National Insurance are calculated in exactly the same way as they would be for any other employee — using your tax code, the same income tax bands, and the same NI thresholds. Nothing about being paid via an umbrella company itself makes your personal tax rate higher or lower. Where confusion usually arises is in comparing the headline day rate to a directly-employed colleague's daily-equivalent pay: because the umbrella company's employer-side deductions and margin come out of the assignment rate before your gross pay is even calculated, a £180 assignment rate umbrella-processed day and a school's own £180-a-day direct pay figure are simply not the same thing, even though they might look identical on paper. Always compare like with like — net take-home pay against net take-home pay — rather than headline rate against headline rate.

It's also worth understanding that having multiple short assignments across a tax year, sometimes through more than one agency or umbrella company, can occasionally lead to your Personal Allowance being applied inconsistently in-year, or an emergency tax code being used on a new umbrella employment until HMRC's records catch up. This usually corrects itself automatically as HMRC reconciles your record, or can be resolved by contacting HMRC directly, but it's a common source of a supply teacher seeing an unexpectedly low net payment on a first payslip with a new umbrella company, and is worth checking rather than assuming something has gone wrong with the umbrella's calculation itself.

Putting it together

Supply teaching can be a genuinely good option — for flexibility, for testing out different schools, for fitting work around other commitments — but it only works well financially when you understand which of the two structures you're actually in. Agency supply via an umbrella company involves real, legitimate costs (employer NI, the Apprenticeship Levy, the umbrella's margin) sitting between the day rate you're quoted and the money that reaches you, and generally leaves you outside the Teachers' Pension Scheme unless you specifically find and ask about an arrangement that includes it. Direct or long-term supply, booked straight through a school's own payroll, usually pays and pensions better for the same work, at the cost of some flexibility. Ask the specific questions above before accepting any booking, and never take a headline day rate as a reliable estimate of your own take-home pay.