The AWR 12-Week Rule for Supply Teachers (2026)

The 12-week rule is the most valuable right a supply teacher has, and the most widely misunderstood. Agencies rarely volunteer it. Schools often do not know it exists. And the version that circulates in staffrooms and Facebook groups — that you have to work twelve solid weeks in a row, that any gap wipes the slate clean, that the summer holidays kill it every year, that it gets you into the Teachers' Pension Scheme — is wrong in almost every particular, usually in the direction that costs the teacher money.

This page sets out what the Agency Workers Regulations 2010 (SI 2010/93) actually say, section by section, with the clock arithmetic worked through and the limits stated honestly. It is written for a supply teacher booked through an agency and paid via an umbrella company or the agency's own payroll. If you are employed directly by a school or a local authority, you are not an agency worker at all and the regulations do not apply to you — though the STPCD day-rate rules discussed below very much do.

What the 12-week rule actually gives you

The operative provision is regulation 5. Once you have completed the qualifying period, you are entitled to the same basic working and employment conditions as you would have been entitled to for doing the same job had you been recruited directly by the hirer. Read that carefully, because two features of the drafting matter enormously in practice.

First, it is a hypothetical test. There does not have to be a real, identifiable comparator teacher sitting in the staffroom on the same timetable. The question is what the school would have had to pay someone it recruited directly to do your job. If a school has no directly employed teacher covering Year 5 maternity leave, that does not defeat the claim; it simply means the tribunal asks what the school's own pay policy would have produced for such a person.

Second, the comparison is against the hirer's terms, not the agency's. This is the point agencies most often blur. Your assignment rate — the figure the agency pays your umbrella per day — is not the benchmark. Neither is some notional national supply rate. The benchmark is the school's own pay structure. For a maintained school in England that is the School Teachers' Pay and Conditions Document, and for an academy it is whatever pay policy the trust has adopted, which in most trusts still tracks the STPCD closely.

Worth saying plainly: NASUWT states that there are no national pay and conditions for supply teachers employed by agencies, and that individual agencies are free to set their own pay and conditions levels. That is true — up to week twelve. After week twelve, regulation 5 imports the hirer's structure over the top of whatever the agency would otherwise have chosen to pay. That is precisely why the rule matters.

Regulation 6: what counts as equal treatment, and what is excluded

Regulation 6 defines the "basic working and employment conditions" that regulation 5 equalises. The list is closed, and knowing what is not in it is as important as knowing what is.

Included:

• Pay — basic salary or wages, converted where necessary to an hourly or daily rate; overtime; shift and unsocial-hours allowances; and bonuses tied directly to your own individual performance.
• Duration of working time — the hours you can be required to work, on the same basis as a directly recruited person.
• Night work — the rules the hirer applies to night working, where relevant.
• Rest periods and rest breaks — daily and weekly rest, and in-day breaks.
• Annual leave — entitlement on the same footing as a directly recruited employee, where the hirer offers more than the statutory minimum.

Expressly excluded — these do not come with the 12 weeks:

• Occupational pensions, including the Teachers' Pension Scheme.
• Occupational sick pay — the school's contractual sick pay scheme under the Burgundy Book or its own policy.
• Contractual maternity, paternity and adoption pay.
• Redundancy and severance payments.
• Season ticket loans and salary advances.
• Travel and accommodation expenses.
• Share schemes, long-service awards and loyalty payments.

The pension trap every supply teacher should know about

The occupational pension exclusion deserves its own section because the misconception is so widespread and so expensive. A supply teacher who has been at the same secondary school on the same timetable since September does not, on completing week twelve in December, become a member of the Teachers' Pension Scheme. Nothing in the Agency Workers Regulations produces that outcome, and regulation 6 puts it beyond argument by naming occupational pensions in the exclusion list.

TPS membership turns on being in eligible employment with an accepted employer — a local authority, a maintained school, an academy trust, or another body that has been accepted into the scheme. A general umbrella company is not an accepted employer, and completing a qualifying period under the AWR does not change who employs you. The school does not become your employer at week twelve. It never becomes your employer. What changes at week twelve is the rate and conditions the agency must apply, not the identity of the employer.

So the pension outcome for an agency supply teacher is ordinary auto-enrolment into a defined-contribution workplace pension, with the statutory minimum total contribution of 8% of qualifying earnings of which the employer must fund at least 3%. Set against a 2026/27 TPS employer contribution of 28.68% of pensionable pay, with benefits accruing at 1/57th of pensionable pay a year and revalued at CPI plus 1.6% during active service, the gap is not marginal. It is the single biggest financial difference between agency supply and direct employment, and it does not close at twelve weeks, twenty weeks or two hundred.

What equal pay actually means in pounds

Here is where the rule becomes concrete. For a maintained school, a teacher employed on a day-to-day or other short notice basis must under the STPCD be paid on a daily basis calculated on the assumption that a full working year consists of 195 days, with periods of less than a day calculated pro rata. Such a teacher must also be paid in accordance with the same pay ranges and scales that apply to other teachers — in other words, placed on their actual pay point, not on a flat supply rate invented for the occasion.

Put regulation 5 and that STPCD rule together and the arithmetic is straightforward: find the pay point a directly recruited teacher doing your job would sit on, divide by 195, and that is the daily figure equal treatment is measured against. Using the England national pay scale effective 1 September 2026:

These figures come from the STRB's 36th Report, accepted in full by Government on 1 July 2026 — a 3.5% uplift effective 1 September 2026. The STPCD 2026 itself is expected in autumn 2026 once its consultation closes at noon on 23 September 2026, backdated to 1 September. Do the division yourself for whatever point applies to you: the arithmetic is simply salary divided by 195, and NASUWT explicitly warns teachers not to accept less than that for a full day, noting that some schools wrongly argue a supply day is only 6.49 hours and try to pay a fraction accordingly.

A worked comparison

Suppose you are an experienced teacher on M6 who has been covering the same Year 9 maths timetable at the same academy since the start of September. The agency pays your umbrella an assignment rate of £170 a day. On the Thursday of your twelfth calendar week at the school, regulation 5 bites. From that point the comparison is not against £170 — it is against what the trust's pay policy would have produced for a directly recruited teacher doing that job. If that is M6, the equal-treatment daily figure is £46,940 ÷ 195 = £240.72.

The shortfall is roughly £70.72 a day, and over a term of, say, sixty further teaching days that is a little over £4,200 of underpayment. This is why the rule is worth knowing about and why agencies are reluctant to raise it unprompted — the money comes out of the agency's margin or has to be renegotiated with the school.

How the 12 calendar weeks are counted

Regulation 7(1) sets the qualifying period: work in the same role with the same hirer for 12 continuous calendar weeks, during one assignment or across several. Three words in that sentence do the heavy lifting.

Calendar. The unit is a calendar week, not a week of work. Any calendar week in which you work at least part of a day in that role counts as a whole week towards the twelve. A single Tuesday morning counts the week. A three-hour afternoon cover counts the week. This is enormously more generous than the "twelve solid weeks" version most supply teachers have been told, and it means a regular one-day-a-week booking at the same school reaches the qualifying period in a single term.

Same role. The clock attaches to the role, not to the assignment or the purchase order. Several separate bookings, back to back or with gaps, aggregate into one qualifying period so long as they are the same role with the same hirer. An agency that reissues paperwork every half-term has not thereby restarted anything.

Same hirer. The hirer is the school or the trust that is actually using your services — not the agency, and not the umbrella company. Moving to a different school means a different hirer and a genuinely fresh clock, even if the agency and the umbrella stay the same.

One historical limit is worth noting for completeness: under regulation 7(12), time worked before 1 October 2011 — the date the qualifying period provisions came into force — does not count. Fifteen years on this is unlikely to be live for anyone, but it is there in the text.

Regulation 7(8): the breaks that pause rather than reset the clock

This is the most valuable and least explained part of the regulations. Regulation 7(8) lists breaks during which the qualifying clock is paused: the weeks you have already banked survive the break, and when you return to the same role with the same hirer the count picks up where it left off rather than starting again at one.

Regulation 7(9) qualifies the sickness route: paragraph (8)(b) applies only where the break does not exceed 28 weeks, where the pregnancy provision in (8)(c) does not apply instead, and where you supply medical evidence if the agency asks for it. Regulation 7(10) defines the protected period for the pregnancy category.

The provision that matters most to teachers: 7(8)(f)

Paragraph (f) is the standout. It preserves continuity where the break is caused by a temporary cessation in the hirer's requirement for someone to do that role, and where that cessation follows the hirer's established practice. Note what it does not require: it does not require the break to be short, and it does not require the worker to have done anything in particular during it. The gov.uk guidance for employment businesses uses a Christmas closure as its worked example of the provision — a business that shuts down every December as a matter of routine.

A school's holiday calendar is, on any ordinary reading, the paradigm case of an established, planned, recurring cessation. The requirement for cover disappears not because the school has decided it no longer needs you, but because the building is shut for a period everyone knew about in advance and which recurs every year to a published pattern.

There is also a secondary point on the family-leave categories that is more favourable still. Under regulation 7(6) and 7(7), for the pregnancy and maternity category and the statutory family-leave category, the weeks do not merely pause — they continue to accrue during the absence. The gov.uk guidance describes these as continuing to tick. So a supply teacher who reaches week eight of a qualifying period and then begins statutory maternity leave does not come back to week eight; the count has carried on running in her absence.

Worked clock arithmetic

Abstract rules are hard to apply to a real diary. Here are four scenarios that cover most of what happens to supply teachers in practice.

When the clock genuinely does reset

Regulation 8 and the "new role" test. The qualifying period restarts at zero in two situations, and only two.

A new hirer. You start working at a different school or trust. Because the clock tracks a role with a particular hirer, work at School B does not build towards a qualifying period at School A, and vice versa. This is straightforward and rarely disputed.

A substantively different role with the same hirer. This is where agencies sometimes try their luck, and where the regulations are much stricter than the industry lets on. A role is substantively different only where there are genuine differences in the skills or competencies required, the location, the equipment used, or the training needed. And the regulations are explicit about what is not sufficient on its own:

• A different line manager — not enough on its own.
• A different pay rate — not enough on its own.
• A different job title — not enough on its own.
• A new purchase order, a new assignment reference or a fresh booking confirmation — not a role change at all.
• A gap between bookings — that is a continuity question under regulation 7(8), not a new-role question.

There is also a procedural safeguard that is easy to overlook and very useful to a worker: the hirer must notify the agency of the new role in writing for the reset to be effective. If no such written notification exists — and in schools it very often does not, because nobody involved knows the requirement exists — the purported reset has a serious problem before you even get to whether the role was substantively different. When you ask an agency to justify a reset, ask for the hirer's written notification by name.

The Swedish derogation, and why there is no longer a way out

Until 2020 there was a lawful route for an agency to avoid the pay-parity duty altogether, and a great many education agencies used it. Regulations 10 and 11 of the AWR 2010 — the pay-between-assignments provisions, universally known as the Swedish derogation after the member state whose model they were drawn from — allowed an agency to escape regulation 5 on pay entirely, provided it gave the worker a permanent contract of employment with the agency itself and paid them, between assignments, at least 50% of their assignment pay and never below the national minimum wage.

In principle that was a trade: you gave up the right to equal pay and got income security between bookings in exchange. In practice, as the Government itself concluded, the security side of the bargain frequently did not materialise. The stated reason for abolition was that there was limited evidence of agency workers actually receiving pay between assignments, and that the derogation was often used simply to circumvent the rights of agency workers to comparable pay.

Regulations 10 and 11 were revoked by the Agency Workers (Amendment) Regulations 2019 (SI 2019/724), in force 6 April 2020. Agencies were required to write to affected workers by 30 April 2020 to confirm that the provisions no longer applied to them. The practical significance for a supply teacher reading this in 2026 is simple and worth stating flatly: there is now no lawful route by which an agency can contract out of AWR pay parity. Any contract clause, framework term or verbal assurance to the contrary is ineffective, whatever it is called.

You may still encounter the residue of it. Some agencies retain contract templates drafted before 2020, with pay-between-assignments language still embedded in the small print. That language is dead letter. If it is in the contract you are being asked to sign today, that tells you something about the agency's compliance housekeeping, and it is a reasonable thing to query alongside your key information document.

Enforcement: the honest picture

A right is only as good as the mechanism for enforcing it, and here the AWR is weaker than it should be. There are two things a supply teacher can do, and only one of them produces money.

The employment tribunal is the only individual remedy

Under regulation 18 the individual route is a complaint to an employment tribunal. There is no regulator with power to order back-pay to a named individual under the AWR. A claim is normally brought against the agency, the hirer, or both, depending on who is responsible for the breach — and because responsibility for an equal-treatment shortfall can be split (the agency controls the rate; the hirer controls the information about what a directly recruited person would have received), naming both and letting the tribunal apportion is usually the safer course. Take union advice before issuing.

In practice the claim is often framed as an unlawful deduction from wages for the shortfall between what you were paid and the equal-treatment rate, which brings the wages time limits into play.

The Fair Work Agency regulates conduct, not your back-pay

The Fair Work Agency was established on 7 April 2026 under Part 5 of the Employment Rights Act 2025, absorbing the Employment Agency Standards Inspectorate, the Gangmasters and Labour Abuse Authority and the Office of the Director of Labour Market Enforcement into a single intelligence-led enforcement body. EAS and the GLAA were abolished and their functions transferred. For the first time, a state body has powers to enforce holiday pay and statutory sick pay — holiday pay had never previously had any state enforcement body behind it at all, which is a genuinely significant change for supply teachers.

Two limits matter here. First, the FWA's remit over agencies runs through the Employment Agencies Act 1973 and the Conduct Regulations — agency conduct — rather than through the AWR. It cannot order an agency to pay you the equal-treatment shortfall. Second, 2026/27 is being run as a transitional year with a published delivery plan; National Minimum Wage enforcement, for instance, continues to be delivered by HMRC under contract until full transfer in April 2027. Report a non-compliant agency to the FWA — it is worth doing and it feeds the intelligence picture — but never in place of protecting your own tribunal deadline.

Worth knowing as background: the Employment Rights Act 2025 also amends the definition of "employment business" in the Employment Agencies Act 1973 to cover what umbrella companies do, bringing umbrellas within FWA regulation, with a fuller separate umbrella regime expected in 2027. And since 6 April 2026, HMRC rules make recruitment agencies jointly and severally liable for PAYE and NICs an umbrella in their supply chain fails to account for, with no reasonable-care defence — which gives agencies a strong new commercial reason to police their umbrella panels.

How to work out and evidence your own 12 weeks

Nobody is going to do this for you. Agencies are not under a duty to volunteer that you are approaching a qualifying period, and schools generally have no visibility of it at all. The teachers who successfully assert the right are, almost without exception, the ones who kept a record from day one.

A short checklist of the questions worth asking an agency at the point of booking, rather than at the point of dispute:

• Do you track AWR qualifying weeks for this placement, and can I see the record on request?
• What pay point on this school's pay structure would a directly recruited teacher doing this job be placed on?
• What daily rate does that produce on the STPCD 195-day basis, and will that rate apply from week 13?
• If there is a gap in bookings, which limb of regulation 7(8) do you say applies, and will my banked weeks carry forward?
• If you consider a placement to be a new role, will you provide the hirer's written notification of the new role?
• Does my contract contain any pay-between-assignments or Swedish derogation wording, and if so why, given it was revoked on 6 April 2020?

Day-one rights you already have

Not everything in the regulations waits for twelve weeks. From the first day of an assignment you are entitled to the same access as the school's own staff to its collective facilities and amenities — the staffroom, the canteen, parking, childcare facilities where they exist — unless the school can objectively justify treating you differently. You are also entitled to be informed of relevant vacancies at the school on the same basis as its directly employed staff, which matters more than it sounds: it is how supply teachers find out about permanent posts before they are advertised externally.

These day-one rights are often the easiest to assert, because they cost the school nothing and are usually granted the moment they are asked for. They are also a reasonable early test of how a school regards its supply staff.

Putting it together

The 12-week rule is real, it is more generous than most supply teachers believe, and it is worth genuine money — the gap between a typical agency assignment rate and an M6 equal-treatment day rate of £240.72 runs into thousands of pounds over a term. Calendar weeks count, not days. Most gaps pause the clock rather than killing it, and school holidays almost certainly fall into that category. Job-title changes in week eleven rarely survive the regulation 8 test, and the hirer has to notify the agency in writing for a reset to work at all.

Equally, be clear-eyed about the limits. Occupational pensions are excluded, so twelve weeks will never be a route into the Teachers' Pension Scheme. The only individual remedy is a tribunal claim with a short and currently shifting time limit, and no regulator will recover your money for you. The right rewards the teacher who keeps a diary, asks the questions in writing at the time, and moves promptly when the answer is unsatisfactory.

For the holiday-break arithmetic in full, including what happens when you work at a second school over the summer, read the companion page on whether school holidays reset the AWR 12-week clock. Legislation text is at legislation.gov.uk, gov.uk publishes guidance for recruiters, and Acas has a plain-English summary of your rights after 12 weeks.