4-On 4-Off Shift Holiday Entitlement UK 2026

The 4-on-4-off pattern is one of the most common continuous-shift rotations in UK manufacturing, oil and gas, refining, water utilities, ambulance services, fire services, prisons, and security. The worker is on shift for 4 consecutive days, then off for 4 consecutive days, then back on for 4 days, and so on. The cycle is 8 days long and rotates continuously through the year.

Most commonly the shifts are 12 hours long, alternating days and nights in 4-day blocks. A typical month: 4 days of 07:00-19:00, 4 days off, 4 nights of 19:00-07:00, 4 days off, repeat. This produces an average working week of 3.5 days at 12 hours, or 42 hours per week. Over a year, the worker is on shift for 182.5 days and off for 182.75 days, a near-perfect 50/50 split.

The pattern is allowed under the Working Time Regulations 1998 because the average weekly working hours (42) sit below the 48-hour weekly limit. The 11-hour daily rest gap is preserved between shifts because the 12 off-hours between a day and night shift comfortably exceed 11. The weekly rest requirement (24 hours in 7 days) is satisfied by the 4 consecutive days off in every cycle.

Because the 4-on-4-off pattern does not have a fixed number of working days per calendar week (the days drift forward by 1 each week as the cycle and the calendar interact), the cleanest way to express holiday entitlement is in hours, not days. The full-time 5.6-week statutory entitlement converts to 5.6 × 42 = 235.2 hours per leave year.

Expressed as shifts at 12 hours each, that is 235.2 / 12 = 19.6 shifts. Most employers round this to 20 shifts for the contract (a small gain for the worker), or pay the 0.4-shift residual as cash at year-end. The 5.6-week figure is the WTR statutory floor; many employers in heavy industry add contractual extra leave on top, taking the figure to 25 shifts (300 hours) or 28 shifts (336 hours) over the year.

The 12.07% method works identically. Across the leave year the worker works 365.25 / 8 × 4 × 12 = 2,192 hours. 12.07% of 2,192 is 264.6 hours, which is more than the 235.2 hours of statutory leave. The discrepancy is because 12.07% is the calculation for irregular-hours workers, while 4-on-4-off is a fixed pattern. Fixed-pattern workers get 5.6 weeks based on their actual pattern, not 12.07% of hours worked. Some employers default to the higher figure to avoid arguments; the worker should check the contract for the actual method.

Bank holidays do not exist within a 4-on-4-off rotation. The pattern rotates continuously regardless of the calendar, so any given bank holiday is sometimes a working day and sometimes a rest day depending on where the worker is in the cycle. The contract typically handles this in one of two ways. First, treat bank holidays as ordinary working days: if rostered, the worker works the shift; if off, they have a normal rest day.

Second, recognise the 8 bank holidays as additional paid leave or as paid time off in lieu (TOIL). Under this model the worker who is rostered on a bank holiday accrues a day in lieu, taken at a later date. The worker who is off on a bank holiday does not accrue anything. Over a year this averages out to roughly 4 days in lieu per worker, depending on which bank holidays fall on rostered shifts.

The 5.6-week statutory entitlement is unaffected either way. It is calculated on the total working pattern, not on which days are bank holidays. If the contract treats bank holidays as ordinary days, the 5.6 weeks is in addition. If the contract gives TOIL or premium pay for bank holidays, the 5.6 weeks is still in addition to the bank holiday treatment.

Booking holiday on a 4-on-4-off rotation requires the worker to designate which scheduled shifts to convert to leave. Most rosters require holiday to be booked in whole shifts of 12 hours for roster integrity (the replacement cover for the shift is also booked in 12-hour blocks). A few employers allow half-shifts of 6 hours, typically for medical appointments or family commitments.

Booking 4 consecutive days of leave (one full on-block) gives the worker 12 consecutive days off when combined with the 4-day rest period either side. This is the standard pattern for a fortnight's break. Booking 8 consecutive shifts gives 20 consecutive days off (two full on-blocks plus the surrounding rest periods), the standard for a longer holiday. The roster team typically requires 8 weeks of advance notice for blocks of more than 4 shifts.

The pay for each holiday shift is the worker's normal rate including any contractual shift premia and average overtime. Per Bear Scotland v Fulton [2015] IRLR 15 and British Gas Trading v Lock [2016] EWCA Civ 983, holiday pay must reflect normal remuneration, not bare basic pay. For a 4-on-4-off worker on a £15 basic plus £3 shift premium, holiday pay is £18 per hour, not £15. ACAS guidance on calculating holiday pay confirms the normal-pay rule.

Pitfall 1: contract expressed in days, not hours. A "20 days' holiday" entitlement on a 12-hour shift means 20 × 12 = 240 hours, not 20 × 8 = 160 hours. Some payroll systems incorrectly default to the 8-hour day, shortchanging shift workers by a third. The contract should expressly convert days to hours for shift patterns.

Pitfall 2: bank holiday confusion. Many shift workers believe they should get an additional 8 days off because permanent office workers get bank holidays. The contract decides. If bank holidays are ordinary working days under the contract, the 5.6 weeks is the full entitlement. If they are recognised separately, the entitlement is 5.6 weeks plus the bank holiday allowance.

Pitfall 3: holiday pay without shift premium. Per Bear Scotland and Lock, holiday pay must include regular shift premium and average overtime. Paying only basic hourly rate during holiday weeks is a common error and a frequent ground for tribunal claims. The premium-included rate must be applied.

Pitfall 4: rotational drift not accounted for. The 4-on-4-off pattern is 8 days long, so over a calendar year of 365.25 days the cycle drifts. Some calendar years contain 45 full cycles plus a partial cycle; the partial determines whether the worker works 182, 183, or 184 days. Most payroll systems use 182.5 as a smoothing average.