Cracking the fractional timetable formula
Part-time employment is deeply woven into UK education, yet fractional contract pay remains one of the least understood components of payroll engineering. If you work a partial timetable — three days a week, split mornings, term-time only — your contract will declare a fractional multiplier known as your FTE (Full-Time Equivalent) factor.
School business managers compute this decimal fraction using a rigid assessment of your contracted timetable blocks against the standard full-time working week defined by STPCD.
The standard reference framework
Under the statutory School Teachers' Pay and Conditions Document (STPCD), a full-time secondary or primary school teacher is bound to 1,265 directed hours spread across 195 working days per academic cycle.
If your contract sets your operational capacity at a fraction — for example 0.60 FTE — it locks two things together:
- Your mandatory directed-hours obligation drops to 759 (1,265 × 0.6).
- Your base gross pay scales to exactly 60% of the benchmark FTE scale point.
The compound effect on pensions and deductions
A frequent mistake part-time teachers make when checking their payslips is using the headline FTE scale point to figure out their pension deduction tier.
HMRC and the Teachers' Pension Scheme rules state that your active pension contribution percentage is determined exclusively by your actual gross salary earnings, not the unscaled FTE benchmark.
Actual annual gross salary = FTE benchmark scale point × FTE fractional factor
If your standard point is £45,500 (which would place you in the 8.9% pension tier at full-time) but you operate on a 0.50 FTE schedule, your actual gross is £22,750. That lower figure positions you securely in the 7.4% pension tier, cutting your out-of-pocket contribution cost and changing your monthly net pay trajectory.
A 0.60 FTE teacher on M5 Outer London (£43,168 full-time → £25,901 actual) drops two tiers below their full-time peer. Same scale point, very different deduction percentages.
What the FTE factor does not change
- Tax-free Personal Allowance — still £12,570 (PAYE doesn't pro-rata; the tax code stays 1257L). A 0.5 FTE teacher on £22,750 only pays basic-rate tax on roughly £10,180 of it.
- NI Primary Threshold — still £12,570 per year. NI is calculated weekly/monthly so the figure that matters is your periodic earnings, but for whole-year projections the annual primary threshold applies.
- Years toward TPS service — counted in proportion. Two years at 0.5 FTE counts as one year of service toward the career-average benefit, but you keep continuous membership.
Two worked examples
| Scale point | Region | FTE | Actual gross | TPS tier |
|---|---|---|---|---|
| M4 | Inner London | 1.00 | £41,419 | Tier 2 · 8.9% |
| M4 | Inner London | 0.60 | £24,851 | Tier 1 · 7.4% |
| U2 | Rest of E&W | 1.00 | £45,646 | Tier 2 · 8.9% |
| U2 | Rest of E&W | 0.50 | £22,823 | Tier 1 · 7.4% |
Our calculator accounts for regional weightings and part-time hours. Slide the pro-rata controller on the Teachers' Calculator → to your exact contract percentage and see your true monthly net take-home.